Wiki source code of LHT65N LoRaWAN Temperature & Humidity Sensor Manual

Version 55.4 by Xiaoling on 2022/05/23 11:51

version	line-number	content
55.2	1	(% style="text-align:center" %)
	2	[[image:image-20220523111447-1.jpeg\|\|height="448" width="448"]]
	3
2.1	4	{{box cssClass="floatinginfobox" title="Contents"}}
	5	{{toc/}}
	6	{{/box}}
	7
55.2	8	{{toc/}}
2.1	9
55.4	10
	11
52.2	12	= 1.Introduction =
	13
55.2	14	== 1.1 What is LHT65N Temperature & Humidity Sensor ==
52.2	15
2.1	16
	17	The Dragino LHT65N Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes a(% class="mark" %) built-in Temperature & Humidity sensor(%%) and has an external sensor connector to connect to an external (% class="mark" %)Temperature Sensor(%%).
	18
	19	The LHT65N allows users to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, building automation, and so on.
	20
6.1	21	LHT65N has a built-in 2400mAh non-chargeable battery which can be used for up to 10 years*.
2.1	22
	23	LHT65N is full compatible with LoRaWAN v1.0.3 Class A protocol, it can work with a standard LoRaWAN gateway.
	24
6.1	25	LHT65N supports (% class="mark" %)Datalog Feature(%%). It will record the data when there is no network coverage and users can retrieve the sensor value later to ensure no miss for every sensor reading.
2.1	26
6.1	27	*The actual battery life depends on how often to send data, please see the battery analyzer chapter.
2.1	28
55.2	29	== 1.2 Features ==
2.1	30
	31	* Wall mountable
	32	* LoRaWAN v1.0.3 Class A protocol
	33	* Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
	34	* AT Commands to change parameters
	35	* Remote configure parameters via LoRaWAN Downlink
15.1	36	* Firmware upgradeable via program port
6.1	37	* Built-in 2400mAh battery for up to 10 years of use.
2.1	38	* Built-in Temperature & Humidity sensor
	39	* Optional External Sensors
6.1	40	* Tri-color LED to indicate working status
2.1	41	* Datalog feature
	42
55.2	43	== 1.3 Specification ==
2.1	44
	45	Built-in Temperature Sensor:
	46
	47	* Resolution: 0.01 °C
	48	* Accuracy Tolerance : Typ ±0.3 °C
	49	* Long Term Drift: < 0.02 °C/yr
6.1	50	* Operating Range: -40 ~~ 85 °C
2.1	51
	52	Built-in Humidity Sensor:
	53
	54	* Resolution: 0.04 %RH
	55	* Accuracy Tolerance : Typ ±3 %RH
	56	* Long Term Drift: < 0.02 °C/yr
	57	* Operating Range: 0 ~~ 96 %RH
	58
6.1	59	External Temperature Sensor:
2.1	60
	61	* Resolution: 0.0625 °C
	62	* ±0.5°C accuracy from -10°C to +85°C
	63	* ±2°C accuracy from -55°C to +125°C
	64	* Operating Range: -55 °C ~~ 125 °C
	65
55.2	66	= 2. Connect LHT65N to IoT Server =
18.1	67
55.2	68	== 2.1 How does LHT65N work? ==
18.1	69
	70	LHT65N is configured as LoRaWAN OTAA Class A mode by default. Each LHT65N is shipped with a worldwide unique set of OTAA keys. To use LHT65N in a LoRaWAN network, first, we need to put the OTAA keys in LoRaWAN Network Server and then activate LHT65N.
	71
	72	If LHT65N is under the coverage of this LoRaWAN network. LHT65N can join the LoRaWAN network automatically. After successfully joining, LHT65N will start to measure environment temperature and humidity, and start to transmit sensor data to the LoRaWAN server. The default period for each uplink is 20 minutes.
	73
	74
55.2	75	== 2.2 How to Activate LHT65N? ==
18.1	76
	77	The LHT65N has two working modes:
	78
	79	* Deep Sleep Mode: LHT65N doesn’t have any LoRaWAN activation. This mode is used for storage and shipping to save battery life.
19.1	80	* Working Mode: In this mode, LHT65N works as LoRaWAN Sensor mode to Join LoRaWAN network and send out the sensor data to the server. Between each sampling/tx/rx periodically, LHT65 will be in STOP mode (IDLE mode), in STOP mode, LHT65N has the same power consumption as Deep Sleep mode.
18.1	81
	82	The LHT65N is set in deep sleep mode by default; The ACT button on the front is to switch to different modes:
	83
	84	[[image:image-20220515123819-1.png\|\|height="379" width="317"]]
	85
55.2	86	(% border="1" %)
18.1	87	\|Behavior on ACT\|Function\|Action
	88	\|Pressing ACT between 1s < time < 3s\|Test uplink status\|If LHT65N is already Joined to the LoRaWAN network, LHT65N will send an uplink packet, if LHT65N has an external sensor connected, blue led will blink once. If LHT65N has no external sensor, red led will blink once.
	89	\|Pressing ACT for more than 3s\|Active Device\|green led will fast blink 5 times, LHT65N will enter working mode and start to JOIN LoRaWAN network. green led will solid turn on for 5 seconds after join in network.
	90	\|Fast press ACT 5 times\|Deactivate Device\|red led will solid on for 5 seconds. This means LHT65N is in Deep Sleep Mode.
	91
55.2	92	== 2.3 Example to join LoRaWAN network ==
32.1	93
	94	(% class="wikigeneratedid" %)
	95	This section shows an example of how to join the TTN V3 LoRaWAN IoT server. Use with other LoRaWAN IoT servers is of a similar procedure.
	96
	97	(% class="wikigeneratedid" %)
	98	[[image:image-20220522232442-1.png\|\|height="387" width="648"]]
	99
	100	Assume the LPS8N is already set to connect to [[TTN V3 network>>url:https://eu1.cloud.thethings.network]], So it provides network coverage for LHT65N. Next we need to add the LHT65N device in TTN V3:
	101
	102
55.3	103	=== 2.3.1 Step 1: Create Device n TTN ===
32.1	104
	105	Create a device in TTN V3 with the OTAA keys from LHT65N.
	106
	107	Each LHT65N is shipped with a sticker with its device EUI, APP Key and APP EUI as below:
	108
	109	[[image:image-20220522232812-2.png\|\|height="219" width="279"]]
	110
	111	User can enter these keys in the LoRaWAN Server portal. Below is TTN V3 screenshot:
	112
	113	Add APP EUI in the application.
	114
	115	[[image:image-20220522232916-3.png]]
	116
	117
	118	[[image:image-20220522232932-4.png]]
	119
	120
	121	[[image:image-20220522232954-5.png]]
	122
	123	Note: LHT65N use same payload as LHT65.
	124
	125	[[image:image-20220522233026-6.png]]
	126
	127
	128	Input APP EUI, APP KEY and DEV EUI:
	129
	130	[[image:image-20220522233118-7.png]]
	131
	132
55.2	133	=== 2.3.2 Step 2: Activate LHT65N by pressing the ACT button for more than 5 seconds. ===
32.1	134
	135	Use ACT button to activate LHT65N and it will auto-join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and user can see in the panel.
	136
	137	[[image:image-20220522233300-8.png]]
	138
	139
55.3	140	== 2.4 Uplink Payload ==
35.1	141
42.1	142	The uplink payload includes totally 11 bytes. Uplink packets use FPORT=2 and(% class="mark" %) every 20 minutes(%%) send one uplink by default.
35.1	143
	144	After each uplink, the (% class="mark" %)BLUE LED(%%) will blink once.
	145
	146
55.3	147	(% border="1" style="width:572px" %)
35.1	148	\|(% style="width:106px" %)Size(bytes)\|(% style="width:71px" %)2\|(% style="width:128px" %)2\|(% style="width:103px" %)2\|(% style="width:72px" %)1\|(% style="width:89px" %)4
	149	\|(% style="width:106px" %)Value\|(% style="width:71px" %)[[BAT>>path:#Battery]]\|(% style="width:128px" %)(((
	150	[[Built-In>>path:#SHT20_Temperature]]
	151
	152	[[Temperature>>path:#SHT20_Temperature]]
	153	)))\|(% style="width:103px" %)(((
	154	[[Built-in>>path:#SHT20_Humidity]]
	155
	156	[[Humidity>>path:#SHT20_Humidity]]
	157	)))\|(% style="width:72px" %)[[Ext>>path:#Extension_Sensor]] #\|(% style="width:89px" %)[[Ext value>>path:#Extension_sensor_value]]
	158
	159	* The First 6 bytes: has fix meanings for every LHT65N.
	160	* The 7th byte (EXT #): defines the external sensor model.
	161	* The 8^^th^^ ~~ 11^^th^^ byte: the value for external sensor value. The definition is based on external sensor type. (If EXT=0, there won’t be these four bytes.)
	162
55.4	163	=== 2.4.1 Decoder in TTN V3 ===
35.1	164
	165	When the uplink payload arrives TTNv3, it shows HEX format and not friendly to read. We can add LHT65N decoder in TTNv3 for friendly reading.
	166
	167	Below is the position to put the decoder and LHT65N decoder can be download from here:
	168
42.1	169	[[https:~~/~~/www.dropbox.com/sh/r2i3zlhsyrpavla/AAB1sZw3mdT0K7XjpHCITt13a?dl=0 >>https://www.dropbox.com/sh/r2i3zlhsyrpavla/AAB1sZw3mdT0K7XjpHCITt13a?dl=0]]
35.1	170
	171	[[image:image-20220522234118-10.png]]
	172
	173
55.4	174	=== 2.4.2 BAT-Battery Info ===
42.1	175
	176	These two bytes of BAT include the battery state and the actually voltage
	177
	178	(% style="width:646px" %)
	179	\|Bit(bit)\|(% style="width:272px" %)[15:14]\|(% style="width:214px" %)[13:0]
	180	\|Value\|(% style="width:272px" %)(((
	181	BAT Status
	182
	183	00(b): Ultra Low ( BAT <= 2.50v)
	184
	185	01(b): Low (2.50v <=BAT <= 2.55v)
	186
	187	10(b): OK (2.55v <= BAT <=2.65v)
	188
	189	11(b): Good (BAT >= 2.65v)
	190	)))\|(% style="width:214px" %)Actually BAT voltage
	191
	192	[[image:image-20220522235639-1.png]]
	193
	194	Check the battery voltage for LHT65N.
	195
	196	* BAT status=(0Xcba4>>14)&0xFF=11(B)，very good
	197	* Battery Voltage =0xCBF6&0x3FFF=0x0BA4=2980mV
	198
55.4	199	=== 2.4.3 Built-in Temperature ===
42.1	200
	201	[[image:image-20220522235639-2.png]]
	202
	203	* Temperature: 0x0ABB/100=27.47℃
	204
	205	[[image:image-20220522235639-3.png]]
	206
	207	* Temperature: (0xF5C6-65536)/100=-26.18℃
	208
55.4	209	=== 2.4.4 Built-in Humidity ===
42.1	210
	211	[[image:image-20220522235639-4.png]]
	212
	213	* Humidity: 0x025C/10=60.4%
	214
55.4	215	=== 2.4.5 Ext # ===
42.1	216
	217	Bytes for External Sensor:
	218
	219	(% style="width:624px" %)
	220	\|(% style="width:139px" %)EXT # Value\|(% style="width:484px" %)External Sensor Type
	221	\|(% style="width:139px" %)0x01\|(% style="width:484px" %)Sensor E3, Temperature Sensor
	222	\|(% style="width:139px" %)0x09\|(% style="width:484px" %)Sensor E3, Temperature Sensor, Datalog Mod
	223
55.4	224	=== 2.4.6 Ext value ===
42.1	225
55.4	226	==== 2.4.6.1 Ext~=1, E3 Temperature Sensor ====
42.1	227
	228	[[image:image-20220522235639-5.png]]
	229
	230	* DS18B20 temp=0x0ADD/100=27.81℃
	231
	232	The last 2 bytes of data are meaningless
	233
	234	[[image:image-20220522235639-6.png]]
	235
	236	* External temperature= (0xF54F-65536)/100=-27.37℃
	237
	238	The last 2 bytes of data are meaningless
	239
	240	If the external sensor is 0x01, and there is no external temperature connected. The temperature will be set to 7FFF which is 327.67℃
	241
	242
55.4	243	==== 2.4.6.2 Ext~=9, E3 sensor with Unix Timestamp ====
42.1	244
	245	Timestamp mode is designed for LHT65N with E3 probe, it will send the uplink payload with Unix timestamp. With the limitation of 11 bytes (max distance of AU915/US915/AS923 band), the time stamp mode will be lack of BAT voltage field, instead, it shows the battery status. The payload is as below:
	246
	247
55.4	248	(% border="1" style="width:697px" %)
42.1	249	\|(% style="width:96px" %)Size(bytes)\|(% style="width:164px" %)2\|(% style="width:104px" %)2\|(% style="width:106px" %)2\|(% style="width:108px" %)1\|(% style="width:116px" %)4
	250	\|(% style="width:96px" %)Value\|(% style="width:164px" %)[[External temperature>>path:#DS18b20_value]]\|(% style="width:104px" %)(((
	251	[[Built-In>>path:#SHT20_Temperature]]
	252
	253	[[Temperature>>path:#SHT20_Temperature]]
	254	)))\|(% style="width:106px" %)(((
	255	[[BAT Status &>>path:#BAT_Humidity]]
	256
	257	[[Built-in>>path:#BAT_Humidity]]
	258
	259	[[Humidity>>path:#BAT_Humidity]]
	260	)))\|(% style="width:108px" %)[[Status & Ext>>path:#Status_EXT]]\|(% style="width:116px" %)(((
	261	[[Unix>>path:#Unix_Time_Stamp]]
	262
	263	[[Time Stamp>>path:#Unix_Time_Stamp]]
	264	)))
	265
55.4	266	* Battery status & [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)Built-in Humidity>>path:#SHT20_Humidity]]
42.1	267
55.4	268	(% border="1" style="width:587px" %)
42.1	269	\|Bit(bit)\|(% style="width:280px" %)[15:14]\|(% style="width:136px" %)[11:0]
	270	\|Value\|(% style="width:280px" %)(((
	271	BAT Status
	272
	273	00(b): Ultra Low ( BAT <= 2.50v)
	274
	275	01(b): Low (2.50v <=BAT <= 2.55v)
	276
	277	10(b): OK (2.55v <= BAT <=2.65v)
	278
	279	11(b): Good (BAT >= 2.65v)
	280	)))\|(% style="width:136px" %)(((
	281	[[Built-in Humidity>>path:#SHT20_Humidity]]
	282
	283
	284	)))
	285
	286	* Status & Ext Byte
	287
55.4	288	(% border="1" style="width:732px" %)
42.1	289	\|(% style="width:128px" %)Bits\|(% style="width:102px" %)7\|(% style="width:145px" %)6\|(% style="width:117px" %)5\|(% style="width:147px" %)4\|(% style="width:90px" %)[3:0]
	290	\|(% style="width:128px" %)Status & Ext\|(% style="width:102px" %)Not Defined\|(% style="width:145px" %)Poll Message Flag\|(% style="width:117px" %)Sync time OK\|(% style="width:147px" %)Unix Time Request\|(% style="width:90px" %)(((
	291	Ext:
	292
	293	0b(1001)
	294	)))
	295
	296	* Poll Message Flag: 1: This message is a poll message reply, 0: means this is a normal uplink.
	297	* Sync time OK: 1: Set time ok，0: N/A. After time SYNC request is sent, LHT65N will set this bit to 0 until got the time stamp from the application server.
	298	* Unix Time Request:1: Request server downlink Unix time, 0 : N/A. In this mode, LHT65N will set this bit to 1 every 10 days to request a time SYNC. (AT+SYNCMOD to set this)
	299
55.4	300	== 2.5 Show data on Datacake ==
42.1	301
47.1	302	Datacake IoT platform provides a human-friendly interface to show the sensor data, once we have sensor data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:
	303
	304	Step 1: Be sure that your device is programmed and properly connected to the LoRaWAN network.
	305
	306	Step 2: Configure your Application to forward data to Datacake you will need to add integration. Go to TTN V3 Console ~-~-> Applications ~-~-> Integrations ~-~-> Add Integrations.
	307
	308
	309	Add Datacake:
	310
	311	[[image:image-20220523000825-7.png\|\|height="262" width="583"]]
	312
	313
	314	Select default key as Access Key:
	315
	316	[[image:image-20220523000825-8.png\|\|height="453" width="406"]]
	317
	318
	319	In Datacake console ([[https:~~/~~/datacake.co/>>url:https://datacake.co/]]) , add LHT65 device.
	320
	321	[[image:image-20220523000825-9.png\|\|height="366" width="392"]]
	322
	323
	324
	325	[[image:image-20220523000825-10.png\|\|height="432" width="762"]]
	326
	327
55.4	328	== 2.6 Datalog Feature ==
47.1	329
51.1	330	This feature is always enabled. When user wants to retrieve the sensor value, he can send a poll command from the IoT platform to ask LHT65N to send the value in the required time slot.
	331
55.4	332	=== 2.6.1 Unix TimeStamp ===
51.1	333
	334	LHT65N uses Unix TimeStamp format based on
	335
	336	[[image:image-20220523001219-11.png\|\|height="97" width="627"]]
	337
	338
	339	User can get this time from link: [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/]] :
	340
	341	Below is the converter example
	342
55.4	343	[[image:image-20220523001219-12.png\|\|height="302" width="730"]]
51.1	344
	345	So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set the current time 2021 – Jan ~-~- 29 Friday 03:03:25
	346
	347
55.4	348	=== 2.6.2 Set Device Time ===
51.1	349
	350	There are two ways to set device’s time:
	351
	352	~1. Through LoRaWAN MAC Command (Default settings)
	353
	354	User need to set SYNCMOD=1 to enable sync time via MAC command.
	355
	356	Once LHT65N Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to LHT65N. If LHT65N fails to get the time from the server, LHT65N will use the internal time and wait for next time request (AT+SYNCTDC to set the time request period, default is 10 days).
	357
	358	Note: LoRaWAN Server need to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature, Chirpstack,TTN V3 v3 and loriot support but TTN V3 v2 doesn’t support. If server doesn’t support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN V3 v2 if SYNCMOD=1.
	359
	360
	361	2. Manually Set Time
	362
	363	User needs to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
	364
	365
55.4	366	=== 2.6.3 Poll sensor value ===
51.1	367
	368	User can poll sensor value based on timestamps from the server. Below is the downlink command.
	369
	370
55.4	371	(% border="1" style="width:454px" %)
51.1	372	\|(% style="width:69px" %)1byte\|(% style="width:129px" %)4bytes\|(% style="width:134px" %)4bytes\|(% style="width:119px" %)1byte
	373	\|(% style="width:69px" %)31\|(% style="width:129px" %)Timestamp start\|(% style="width:134px" %)Timestamp end\|(% style="width:119px" %)Uplink Interval
	374
	375	Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period, use the uplink interval.
	376
	377
	378	For example, downlink command 31 5FC5F350 5FC6 0160 05
	379
	380	Is to check 2020/12/1 07:40:00 to 2020/12/1 08:40:00’s data
	381
	382	Uplink Internal =5s，means LHT65N will send one packet every 5s. range 5~~255s.
	383
	384
55.4	385	=== 2.6.4 Datalog Uplink payload ===
51.1	386
	387	The Datalog poll reply uplink will use below payload format.
	388
	389
	390	Retrieval data payload
	391
55.4	392	(% border="1" %)
51.1	393	\|Size(bytes)\|2\|2\|2\|1\|4
	394	\|Value\|[[External sensor data>>path:#Extension_sensor_value]]\|(((
	395	[[Built-In>>path:#SHT20_Temperature]]
	396
	397	[[Temperature>>path:#SHT20_Temperature]]
	398	)))\|(((
	399	[[Built-in>>path:#SHT20_Humidity]]
	400
	401	[[Humidity>>path:#SHT20_Humidity]]
	402	)))\|[[Poll message flag & Ext>>path:#Poll_EXT]]\|(((
	403	[[Unix Time Stamp>>path:#Unix_Time_Stamp]]
	404
	405
	406	)))
	407
	408	Poll message flag & Ext
	409
	410
55.4	411	(% border="1" %)
51.1	412	\|Bits\|7\|6\|5\|4\|[3:0]
	413	\|Status & Ext\|Not Defined\|Poll Message Flag\|Sync time OK\|Unix Time Request\|(((
	414	Ext:
	415
	416	0b(1001)
	417	)))
	418
	419	Poll Message Flag: 1: This message is a poll message reply.
	420
	421	* Poll Message Flag is set to 1.
	422	* Each data entry is 11 bytes, to save airtime and battery, devices will send max bytes according to the current DR and Frequency bands.
	423
	424	For example, in US915 band, the max payload for different DR is:
	425
	426	a) DR0: max is 11 bytes so one entry of data
	427
	428	b) DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
	429
	430	c) DR2: total payload includes 11 entries of data
	431
	432	d) DR3: total payload includes 22 entries of data.
	433
	434	If devise doesn’t have any data in the polling time. Device will uplink 11 bytes of 0
	435
	436
	437	Example:
	438
	439	If LHT65N has below data inside Flash:
	440
	441	Flash Addr \|Unix Time \| Ext \| BAT voltage\| Value
	442
	443	80196E0 21/1/19 04:27:03 1 3145 sht_temp=22.00 sht_hum=32.6 ds_temp=327.67
	444
	445	80196F0 21/1/19 04:28:57 1 3145 sht_temp=21.90 sht_hum=33.1 ds_temp=327.67
	446
	447	8019700 21/1/19 04:30:30 1 3145 sht_temp=21.81 sht_hum=33.4 ds_temp=327.67
	448
	449	8019710 21/1/19 04:40:30 1 3145 sht_temp=21.65 sht_hum=33.7 ds_temp=327.67
	450
	451	8019720 21/1/19 04:50:30 1 3147 sht_temp=21.55 sht_hum=34.1 ds_temp=327.67
	452
	453	8019730 21/1/19 05:00:30 1 3149 sht_temp=21.50 sht_hum=34.1 ds_temp=327.67
	454
	455	8019740 21/1/19 05:10:30 1 3149 sht_temp=21.43 sht_hum=34.6 ds_temp=327.67
	456
	457	8019750 21/1/19 05:20:30 1 3151 sht_temp=21.35 sht_hum=34.9 ds_temp=327.67
	458
	459
	460	If user sends below downlink command:
	461
	462	3160065F9760066DA705
	463
	464	Where : Start time: 60065F97 = time 21/1/19 04:27:03
	465
	466	Stop time 60066DA7= time 21/1/19 05:27:03
	467
	468
	469	LHT65N will uplink this payload.
	470
55.4	471	[[image:image-20220523001219-13.png\|\|height="421" width="727"]]
51.1	472
	473	7FFF089801464160065F977FFF088E014B41600660097FFF0885014E41600660667FFF0875015141600662BE7FFF086B015541600665167FFF08660155416006676E7FFF085F015A41600669C67FFF0857015D4160066C1E
	474
	475	Where the first 11 bytes is for the first entry:
	476
	477	7FFF089801464160065F97
	478
	479	Ext sensor data=0x7FFF/100=327.67
	480
	481	Temp=0x0898/100=22.00
	482
	483	Hum=0x0146/10=32.6
	484
	485	poll message flag & Ext=0x41,means reply data,Ext=1
	486
	487	Unix time is 0x60065F97=1611030423s=21/1/19 04:27:03
	488
	489
55.4	490	== 2.7 Alarm Mode ==
51.1	491
	492	Alarm mode feature is added since firmware v1.5. When device is in Alarm mode, it will check the built-in sensor temperature in a short interval. If the temperature exceeds the pre-configure range, it will send an uplink immediately.
	493
	494
	495	Note: Alarm mode will increase a little big the power consumption, we recommend extending the normal reading time when enabling this feature.
	496
	497
	498	AT Commands for Alarm mode:
	499
	500	AT+WMOD=1: Enable/Disable Alarm Mode. (0:Disable, 1: Enable)
	501
	502	AT+CITEMP=1: The interval to check the temperature for Alarm. (Unit: minute)
	503
	504
	505
55.4	506	== 2.8 LED Indicator ==
18.1	507
19.1	508	The LHT65N has a triple color LED which for easy shows different stage.
	509
	510	While pressing ACT button, the LED will work as per LED status with ACT button.
	511
	512	In a normal working state:
	513
	514	* For each uplink, the BLUE LED or RED LED will blink once.
	515	* BLUE LED when an external sensor is connected
	516	* RED LED when an external sensor is not connected
	517	* For each success downlink, the PURPLE LED will blink once
	518
23.1	519	----
19.1	520
55.4	521	== 2.9 Installation ==
21.1	522
52.1	523	[[image:image-20220516231650-1.png\|\|height="436" width="428"]]
21.1	524
55.4	525	= 3. Sensors & Accessories =
21.1	526
55.4	527	== 3.1 E3 Temperature Probe ==
21.1	528
14.1	529	[[image:image-20220515080154-4.png\|\|height="182" width="161"]] [[image:image-20220515080330-5.png\|\|height="201" width="195"]]
	530
	531
	532	With Temperature sensor with 2 meters cable long
	533
	534	* Resolution: 0.0625 °C
	535	* ±0.5°C accuracy from -10°C to +85°C
	536	* ±2°C accuracy from -55°C to +125°C
	537	* Operating Range: -40 ~~ 125 °C
	538	* -55°C to 125°C
	539	* Working voltage 2.35v ~~ 5v
	540
55.4	541	= 4. Configure LHT65N via AT Command or LoRaWAN Downlink =
52.1	542
	543	Use can configure LHT65N via AT Command or LoRaWAN Downlink.
	544
	545	* AT Command Connection: See [[FAQ>>path:#AT_COMMAND]].
	546	* LoRaWAN Downlink instruction for different platforms:
	547
	548	[[http:~~/~~/wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_Server>>url:http://wiki.dragino.com/index.php?title=Main_Page#Use_Note_for_Server]]
	549
	550	There are two kinds of commands to configure LHT65N, they are:
	551
	552	* General Commands.
	553
	554	These commands are to configure:
	555
	556	* General system settings like: uplink interval.
	557	* LoRaWAN protocol & radio-related commands.
	558
	559	They are the same for all Dragino Devices which supports DLWS-005 LoRaWAN Stack(Note~~). These commands can be found on the wiki:
	560
	561	[[http:~~/~~/wiki.dragino.com/index.php?title=End_Device_Downlink_Command>>url:http://wiki.dragino.com/index.php?title=End_Device_Downlink_Command]]
	562
	563	* Commands special design for LHT65N
	564
	565	These commands are only valid for LHT65N, as below:
	566
55.4	567	== 4.1 Set Transmit Interval Time ==
52.1	568
	569	Feature: Change LoRaWAN End Node Transmit Interval.
	570
	571	AT Command: AT+TDC
	572
55.4	573	(% border="1" %)
52.1	574	\|Command Example\|Function\|Response
	575	\|AT+TDC?\|Show current transmit Interval\|(((
	576	30000
	577
	578	OK
	579
	580	the interval is 30000ms = 30s
	581	)))
	582	\|AT+TDC=60000\|Set Transmit Interval\|(((
	583	OK
	584
	585	Set transmit interval to 60000ms = 60 seconds
	586	)))
	587
	588	Downlink Command: 0x01
	589
	590	Format: Command Code (0x01) followed by 3 bytes time value.
	591
	592	If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
	593
	594	* Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
	595	* Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
	596
55.4	597	== 4.2 Set External Sensor Mode ==
52.1	598
	599	Feature: Change External Sensor Mode.
	600
	601	AT Command: AT+EXT
	602
55.4	603	(% border="1" %)
52.1	604	\|Command Example\|Function\|Response
	605	\|AT+EXT?\|Get current external sensor mode\|(((
	606	1
	607
	608	OK
	609
	610	External Sensor mode =1
	611	)))
	612	\|AT+EXT=1\|(% colspan="2" %)Set external sensor mode to 1
	613	\|AT+EXT=9\|(% colspan="2" %)Set to external DS18B20 with timestamp
	614
	615	Downlink Command: 0xA2
	616
	617	Total bytes: 2 ~~ 5 bytes
	618
	619	Example:
	620
	621	* 0xA201: Set external sensor type to E1
	622	* 0xA209: Same as AT+EXT=9
	623	* 0xA20702003c,Same as AT+SETCNT=60
	624
55.4	625	== 4.3 Enable/Disable uplink Temperature probe ID ==
52.1	626
	627	Feature: If PID is enabled, device will send the temperature probe ID on:
	628
	629	* First Packet after OTAA Join
	630	* Every 24 hours since the first packet.
	631
	632	PID is default set to disable (0)
	633
	634
	635	AT Command:
	636
55.4	637	(% border="1" %)
52.1	638	\|Command Example\|Function\|Response
	639	\|AT+PID=1\|Enable PID uplink\|OK
	640
	641	Downlink Command:
	642
	643	* 0xA800 à AT+PID=0
	644	* 0xA801 à AT+PID=1
	645
55.4	646	== 4.4 Set Password ==
52.1	647
	648	Feature: Set device password, max 9 digits
	649
	650	AT Command: AT+PWORD
	651
55.4	652	(% border="1" %)
52.1	653	\|Command Example\|Function\|Response
	654	\|AT+PWORD=?\|Show password\|(((
	655	123456
	656
	657
	658	OK
	659	)))
	660	\|AT+PWORD=999999\|Set password\|OK
	661
	662	Downlink Command:
	663
	664	No downlink command for this feature.
	665
55.4	666	== 4.5 Quit AT Command ==
52.1	667
	668	Feature: Quit AT Command mode, so user needs to input password again before use AT Commands.
	669
	670	AT Command: AT+DISAT
	671
55.4	672	(% border="1" %)
52.1	673	\|Command Example\|Function\|Response
	674	\|AT+DISAT\|Quit AT Commands mode\|OK
	675
	676	Downlink Command:
	677
	678	No downlink command for this feature.
	679
	680
55.4	681	== 4.6 Set to sleep mode ==
52.1	682
	683	Feature: Set device to sleep mode
	684
	685	AT Command: AT+SLEEP
	686
55.4	687	(% border="1" %)
52.1	688	\| \| \|
	689	\|Command Example\|Function\|Response
	690	\|AT+SLEEP\|Set to sleep mode\|(((
	691	Clear all stored sensor data…
	692
	693	OK
	694	)))
	695
	696	Downlink Command:
	697
	698	* There is no downlink command to set to Sleep mode.
	699
55.4	700	== 4.7 Set system time ==
52.1	701
	702	Feature: Set system time, unix format. [[See here for format detail.>>path:#TimeStamp]]
	703
	704	AT Command:
	705
55.4	706	(% border="1" %)
52.1	707	\|Command Example\|Function
	708	\|AT+TIMESTAMP=1611104352\|(((
	709	OK
	710
	711	Set System time to 2021-01-20 00:59:12
	712	)))
	713
	714	Downlink Command:
	715
	716	0x306007806000 ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
	717
55.4	718	== 4.8 Set Time Sync Mode ==
52.1	719
	720	Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
	721
	722	SYNCMOD is set to 1 by default. If user want to set a different time from LoRaWAN server, user need to set this to 0.
	723
	724
	725	AT Command:
	726
	727	\|Command Example\|Function
	728	\|AT+SYNCMOD=1\|Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
	729
	730	Downlink Command:
	731
	732	0x28 01 ~/~/ Same As AT+SYNCMOD=1
	733
	734	0x28 00 ~/~/ Same As AT+SYNCMOD=0
	735
55.4	736	== 4.9 Set Time Sync Interval ==
52.1	737
	738	Feature: Define System time sync interval. SYNCTDC default value: 10 days.
	739
	740	AT Command:
	741
55.4	742	(% border="1" %)
52.1	743	\|Command Example\|Function
	744	\|AT+SYNCTDC=0x0A\|Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
	745
	746	Downlink Command:
	747
	748	0x29 0A ~/~/ Same as AT+SYNCTDC=0x0A
	749
55.4	750	== 4.10 Print data entries base on page. ==
52.1	751
	752	Feature: Print the sector data from start page to stop page (max is 416 pages).
	753
	754	AT Command: AT+PDTA
	755
55.4	756	(% border="1" %)
52.1	757	\|Command Example\|Response
	758	\|(((
	759	AT+PDTA=1,3
	760
	761
	762
	763	Print page 1 to 3
	764	)))\|(((
	765	8019500 19/6/26 16:48 1 2992 sht_temp=28.21 sht_hum=71.5 ds_temp=27.31
	766
	767	8019510 19/6/26 16:53 1 2994 sht_temp=27.64 sht_hum=69.3 ds_temp=26.93
	768
	769	8019520 19/6/26 16:58 1 2996 sht_temp=28.39 sht_hum=72.0 ds_temp=27.06
	770
	771	8019530 19/6/26 17:03 1 2996 sht_temp=27.97 sht_hum=70.4 ds_temp=27.12
	772
	773	8019540 19/6/26 17:08 1 2996 sht_temp=27.80 sht_hum=72.9 ds_temp=27.06
	774
	775	8019550 19/6/26 17:13 1 2998 sht_temp=27.30 sht_hum=72.4 ds_temp=26.68
	776
	777	8019560 19/6/26 17:22 1 2992 sht_temp=26.27 sht_hum=62.3 ds_temp=26.56
	778
	779	8019570
	780
	781	8019580
	782
	783	8019590
	784
	785	80195A0
	786
	787	80195B0
	788
	789	80195C0
	790
	791	80195D0
	792
	793	80195E0
	794
	795	80195F0
	796
	797
	798	OK
	799	)))
	800
	801	Downlink Command:
	802
	803	No downlink commands for feature
	804
55.4	805	== 4.11 Print last few data entries. ==
52.1	806
	807	Feature: Print the last few data entries
	808
	809	AT Command: AT+PLDTA
	810
55.4	811	(% border="1" %)
52.1	812	\|Command Example\|Response
	813	\|(((
	814	AT+PLDTA=5
	815
	816
	817
	818	Print last 5 entries
	819	)))\|(((
	820	Stop Tx and RTP events when read sensor data
	821
	822	1 19/6/26 13:59 1 3005 sht_temp=27.09 sht_hum=79.5 ds_temp=26.75
	823
	824	2 19/6/26 14:04 1 3007 sht_temp=26.65 sht_hum=74.8 ds_temp=26.43
	825
	826	3 19/6/26 14:09 1 3007 sht_temp=26.91 sht_hum=77.9 ds_temp=26.56
	827
	828	4 19/6/26 14:15 1 3007 sht_temp=26.93 sht_hum=76.7 ds_temp=26.75
	829
	830	5 19/6/26 14:20 1 3007 sht_temp=26.78 sht_hum=76.6 ds_temp=26.43
	831
	832	Start Tx and RTP events
	833
	834	OK
	835	)))
	836
	837	Downlink Command:
	838
	839	No downlink commands for feature
	840
55.4	841	== 4.12 Clear Flash Record ==
52.1	842
	843	Feature: Clear flash storage for data log feature.
	844
	845	AT Command: AT+CLRDTA
	846
55.4	847	(% border="1" %)
52.1	848	\|Command Example\|Function\|Response
	849	\|AT+CLRDTA\|Clear date record\|(((
	850	Clear all stored sensor data…
	851
	852	OK
	853	)))
	854
	855	Downlink Command: 0xA3
	856
	857	* Example: 0xA301 ~/~/Same as AT+CLRDTA
	858
55.4	859	= 5. Battery & How to replace =
52.1	860
55.4	861	== 5.1 Battery Type ==
11.1	862
	863	LHT65N is equipped with a 2400mAH Li-MnO2 (CR17505) battery . The battery is an un-rechargeable battery with low discharge rate targeting for up to 8~~10 years use. This type of battery is commonly used in IoT devices for long-term running, such as water meters.
	864
	865	The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.
14.1	866	[[image:image-20220515075034-1.png\|\|height="208" width="644"]]
11.1	867
	868	The minimum Working Voltage for the LHT65N is ~~ 2.5v. When battery is lower than 2.6v, it is time to change the battery.
	869
	870
55.4	871	== 5.2 Replace Battery ==
11.1	872
	873	LHT65N has two screws on the back, Unscrew them, and changing the battery inside is ok. The battery is a general CR17450 battery. Any brand should be ok.
	874
	875	[[image:image-20220515075440-2.png\|\|height="338" width="272"]][[image:image-20220515075625-3.png\|\|height="193" width="257"]]
	876
55.4	877	== 5.3 Battery Life Analyze ==
11.1	878
	879	Dragino battery-powered products are all run in Low Power mode. User can check the guideline from this link to calculate the estimated battery life:
	880	https:~/~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf
	881
55.4	882	= 6. Order Info =
11.1	883
14.1	884	Part Number: (% class="mark" %)LHT65N-XX
2.1	885
	886	XX: The default frequency band
	887
	888	* AS923: LoRaWAN AS923 band
	889	* AU915: LoRaWAN AU915 band
	890	* EU433: LoRaWAN EU433 band
	891	* EU868: LoRaWAN EU868 band
	892	* KR920: LoRaWAN KR920 band
	893	* US915: LoRaWAN US915 band
	894	* IN865: LoRaWAN IN865 band
	895	* CN470: LoRaWAN CN470 band
4.1	896
14.1	897	YY: Sensor Accessories
	898
	899	* E3: External Temperature Probe
	900
55.4	901	= 7. Packing Info =
4.1	902
	903	Package Includes:
	904
	905	* LHT65N Temperature & Humidity Sensor x 1
	906	* Program cable x 1
	907	* Optional external sensor
	908
	909	Dimension and weight:
	910
	911	* Device Size: 13.5 x 7 x 3 cm
	912	* Device Weight: 105g
	913	* Package Size / pcs : 14.5 x 8 x 5 cm
	914	* Weight / pcs : 170g
	915
55.4	916	= 8. FCC Warning =
7.1	917
	918	This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
	919
55.4	920	(1) This device may not cause harmful interference；
7.1	921
55.4	922	(2) this device must accept any interference received, including interference that may cause undesired operation.

Wiki source code of LHT65N LoRaWAN Temperature & Humidity Sensor Manual

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