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1	1	(% style="text-align:center" %)
2	2	[[image:1654846127817-788.png]]
3	3
4		-**Contents:**
5	5
	5	+
	6	+
	7	+
	8	+**Table of Contents:**
	9	+
6	6	{{toc/}}
7	7
8	8
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25	25	)))
26	26
27	27	(((
28		-
29		-)))
30		-
31		-(((
32	32	It detects the distance** (% style="color:#4472c4" %) between the measured object and the sensor(%%)**, and uploads the value via wireless to LoRaWAN IoT Server.
33	33	)))
34	34
35	35	(((
36		-
37		-)))
38		-
39		-(((
40	40	The LoRa wireless technology used in LDDS75 allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.
41	41	)))
42	42
43	43	(((
44		-
45		-)))
46		-
47		-(((
48	48	LDDS75 is powered by (% style="color:#4472c4" %)** 4000mA or 8500mAh Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
49	49	)))
50	50
51	51	(((
52		-
53		-)))
54		-
55		-(((
56	56	Each LDDS75 pre-loads with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect if there is network coverage, after power on.
57	57	)))
58	58
59	59	(((
60		-
61		-)))
62		-
63		-(((
64	64	(% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
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66	66	)))
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88	88
89	89
90	90
91		-
92		-
93	93	== 1.3  Specification ==
94	94
95	95	=== 1.3.1  Rated environmental conditions ===
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97	97	[[image:image-20220610154839-1.png]]
98	98
99	99	(((
100		-**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)**
	82	+**Remarks: (1) a. When the ambient temperature is 0-39 ℃, the maximum humidity is 90% (non-condensing);  **
	83	+
	84	+**~ b. When the ambient temperature is 40-50 ℃, the highest humidity is the highest humidity in the natural world at the current temperature (no condensation)**
101	101	)))
102	102
103	103
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133	133	* Sewer
134	134	* Bottom water level monitoring
135	135
	120	+
	121	+
136	136	== 1.6  Pin mapping and power on ==
137	137
138	138
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169	169	)))
170	170
171	171	(((
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172	172	(% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS75.
173	173	)))
174	174
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188	188	)))
189	189
190	190	(((
	179	+
	180	+
191	191	**Add APP EUI in the application**
192	192	)))
193	193
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287	287	* If the sensor value is 0x0000, it means system doesn’t detect ultrasonic sensor.
288	288	* If the sensor value lower than 0x0118 (280mm), the sensor value will be invalid. Since v1.1.4, all value lower than 280mm will be set to 0x0014(20mm) which means the value is invalid.
289	289
	280	+
	281	+
290	290	=== 2.3.3  Interrupt Pin ===
291	291
292	292	This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.3A0SetInterruptMode"]] for the hardware and software set up.
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862	862	* Solid ON for 5 seconds once device successful Join the network.
863	863	* Blink once when device transmit a packet.
864	864
	857	+
	858	+
865	865	== 2.8  ​Firmware Change Log ==
866	866
867	867
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1052	1052	* Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
1053	1053	* Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
1054	1054	)))
	1049	+)))
1055	1055
1056	1056
1057		-
1058		-)))
1059	1059
	1053	+
	1054	+
1060	1060	== 3.3  Set Interrupt Mode ==
1061	1061
1062	1062	Feature, Set Interrupt mode for GPIO_EXIT.
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1078	1078	* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1079	1079
1080	1080
	1076	+
1081	1081	= 4.  FAQ =
1082	1082
1083	1083	== 4.1  What is the frequency plan for LDDS75? ==
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1138	1138	* (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
1139	1139
1140	1140
	1137	+
1141	1141	= 7. ​ Packing Info =
1142	1142
1143	1143
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1153	1153	* Weight / pcs : g
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1155	1155
	1153	+
1156	1156	= 8.  ​Support =
1157	1157
1158	1158	* Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.