Summary

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Details

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Author

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1		-XWiki.Xiaoling
	1	+XWiki.Edwin

Content

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13	13
14	14
15	15	(((
16		-[[image:image-20220715000242-1.png||height="110" width="132"]]
	16	+(((
	17	+[[image:image-20220719093358-2.png||height="145" width="220"]](% style="color:blue" %)** **
	18	+)))
17	17
	20	+(((
	21	+
	22	+)))
	23	+
	24	+(((
18	18	(% style="color:blue" %)**Dragino LA66**(%%) is a small wireless LoRaWAN module that offers a very compelling mix of long-range, low power consumption, and secure data transmission. It is designed to facilitate developers to quickly deploy industrial-level LoRaWAN and IoT solutions. It helps users to turn the idea into a practical application and make the Internet of Things a reality. It is easy to create and connect your things everywhere.
19	19	)))
	27	+)))
20	20
21	21	(((
22		-(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
	30	+(((
	31	+(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.3 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
23	23	)))
	33	+)))
24	24
25	25	(((
	36	+(((
26	26	Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
27	27	)))
28	28
...	...	@@ -29,14 +29,19 @@
29	29	(((
30	30	Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
31	31	)))
	43	+)))
32	32
33	33	(((
	46	+(((
34	34	LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
35	35	)))
	49	+)))
36	36
37	37
	52	+
38	38	== 1.2  Features ==
39	39
	55	+
40	40	* Support LoRaWAN v1.0.4 protocol
41	41	* Support peer-to-peer protocol
42	42	* TCXO crystal to ensure RF performance on low temperature
...	...	@@ -47,8 +47,12 @@
47	47	* Firmware upgradable via UART interface
48	48	* Ultra-long RF range
49	49
	66	+
	67	+
	68	+
50	50	== 1.3  Specification ==
51	51
	71	+
52	52	* CPU: 32-bit 48 MHz
53	53	* Flash: 256KB
54	54	* RAM: 64KB
...	...	@@ -76,6 +76,7 @@
76	76	AT Command is valid over Main TXD and Main RXD. Serial Baud Rate is 9600. AT commands can be found in AT Command documents.
77	77
78	78
	99	+
79	79	== 1.5  Dimension ==
80	80
81	81	[[image:image-20220718094750-3.png]]
...	...	@@ -82,16 +82,15 @@
82	82
83	83
84	84
85		-
86	86	== 1.6  Pin Mapping ==
87	87
	108	+[[image:image-20220720111850-1.png]]
88	88
89		-[[image:image-20220523101537-1.png]]
90	90
91	91
92		-
93	93	== 1.7  Land Pattern ==
94	94
	114	+
95	95	[[image:image-20220517072821-2.png]]
96	96
97	97
...	...	@@ -102,30 +102,47 @@
102	102	== 2.1  Overview ==
103	103
104	104
105		-[[image:image-20220715000826-2.png||height="386" width="449"]]
	125	+(((
	126	+[[image:image-20220715000826-2.png||height="145" width="220"]]
	127	+)))
106	106
	129	+(((
	130	+
	131	+)))
107	107
108		-LA66 LoRaWAN Shield is the Arduino shield base on LA66. Users can use LA66 LoRaWAN Shield to rapidly add LoRaWAN or peer-to-peer LoRa wireless function to  Arduino projects.
	133	+(((
	134	+(% style="color:blue" %)**LA66 LoRaWAN Shield**(%%) is the Arduino shield base on LA66. Users can use LA66 LoRaWAN Shield to rapidly add LoRaWAN or peer-to-peer LoRa wireless function to  Arduino projects.
	135	+)))
109	109
110	110	(((
111		-(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
	138	+(((
	139	+(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.3 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely.  This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
112	112	)))
	141	+)))
113	113
114	114	(((
	144	+(((
115	115	Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
116	116	)))
	147	+)))
117	117
118	118	(((
	150	+(((
119	119	Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
120	120	)))
	153	+)))
121	121
122	122	(((
	156	+(((
123	123	LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
124	124	)))
	159	+)))
125	125
126	126
	162	+
127	127	== 2.2  Features ==
128	128
	165	+
129	129	* Arduino Shield base on LA66 LoRaWAN module
130	130	* Support LoRaWAN v1.0.4 protocol
131	131	* Support peer-to-peer protocol
...	...	@@ -137,8 +137,12 @@
137	137	* Firmware upgradable via UART interface
138	138	* Ultra-long RF range
139	139
	177	+
	178	+
	179	+
140	140	== 2.3  Specification ==
141	141
	182	+
142	142	* CPU: 32-bit 48 MHz
143	143	* Flash: 256KB
144	144	* RAM: 64KB
...	...	@@ -157,27 +157,109 @@
157	157	* LoRa Rx current: <9 mA
158	158	* I/O Voltage: 3.3v
159	159
160		-== 2.4  Pin Mapping & LED ==
161	161
162	162
163	163
	204	+== 2.4  LED ==
	205	+
	206	+
	207	+~1. The LED lights up red when there is an upstream data packet
	208	+2. When the network is successfully connected, the green light will be on for 5 seconds
	209	+3. Purple light on when receiving downlink data packets
	210	+
	211	+
	212	+
164	164	== 2.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
165	165
166	166
	216	+**Show connection diagram：**
167	167
	218	+
	219	+[[image:image-20220723170210-2.png||height="908" width="681"]]
	220	+
	221	+
	222	+
	223	+(% style="color:blue" %)**1.  open Arduino IDE**
	224	+
	225	+
	226	+[[image:image-20220723170545-4.png]]
	227	+
	228	+
	229	+
	230	+(% style="color:blue" %)**2.  Open project**
	231	+
	232	+
	233	+LA66-LoRaWAN-shield-AT-command-via-Arduino-UNO source code link: [[https:~~/~~/www.dropbox.com/sh/cx0pspkwu62pr97/AAAbKh2ioPdZfSDtdDpooYqha?dl=0>>https://www.dropbox.com/sh/cx0pspkwu62pr97/AAAbKh2ioPdZfSDtdDpooYqha?dl=0]]
	234	+
	235	+[[image:image-20220726135239-1.png]]
	236	+
	237	+
	238	+(% style="color:blue" %)**3.  Click the button marked 1 in the figure to compile, and after the compilation is complete, click the button marked 2 in the figure to upload**
	239	+
	240	+[[image:image-20220726135356-2.png]]
	241	+
	242	+
	243	+(% style="color:blue" %)**4.  After the upload is successful, open the serial port monitoring and send the AT command**
	244	+
	245	+
	246	+[[image:image-20220723172235-7.png||height="480" width="1027"]]
	247	+
	248	+
	249	+
168	168	== 2.6  Example: Join TTN network and send an uplink message, get downlink message. ==
169	169
170	170
	253	+(% style="color:blue" %)**1.  Open project**
171	171
172		-== 2.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in DataCake. ==
173	173
	256	+Join-TTN-network source code link: [[https:~~/~~/www.dropbox.com/sh/0sjyncafa0gjv00/AACC2m1orov-QHRkvH8-ddCka?dl=0>>https://www.dropbox.com/sh/0sjyncafa0gjv00/AACC2m1orov-QHRkvH8-ddCka?dl=0]]
174	174
175	175
	259	+[[image:image-20220723172502-8.png]]
	260	+
	261	+
	262	+
	263	+(% style="color:blue" %)**2.  Same steps as 2.5,after opening the serial port monitoring, it will automatically connect to the network and send packets**
	264	+
	265	+
	266	+[[image:image-20220723172938-9.png||height="652" width="1050"]]
	267	+
	268	+
	269	+
	270	+== 2.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in Node-RED. ==
	271	+
	272	+
	273	+(% style="color:blue" %)**1.  Open project**
	274	+
	275	+
	276	+Log-Temperature-Sensor-and-send-data-to-TTN source code link: [[https:~~/~~/www.dropbox.com/sh/0aagmrpec1lxmva/AABMXWVMSHG9dK1_Zv_7xOmCa?dl=0>>https://www.dropbox.com/sh/0aagmrpec1lxmva/AABMXWVMSHG9dK1_Zv_7xOmCa?dl=0]]
	277	+
	278	+
	279	+[[image:image-20220723173341-10.png||height="581" width="1014"]]
	280	+
	281	+
	282	+
	283	+(% style="color:blue" %)**2.  Same steps as 2.5,after opening the serial port monitoring, it will automatically connect to the network and send packets**
	284	+
	285	+
	286	+[[image:image-20220723173950-11.png||height="665" width="1012"]]
	287	+
	288	+
	289	+
	290	+(% style="color:blue" %)**3.  Integration into Node-red via TTNV3**
	291	+
	292	+For the usage of Node-RED, please refer to: [[http:~~/~~/8.211.40.43:8080/xwiki/bin/view/Main/Node-RED/>>http://8.211.40.43:8080/xwiki/bin/view/Main/Node-RED/]]
	293	+
	294	+[[image:image-20220723175700-12.png||height="602" width="995"]]
	295	+
	296	+
	297	+
176	176	== 2.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
177	177
178	178
179	179	=== 2.8.1  Items needed for update ===
180	180
	303	+
181	181	1. LA66 LoRaWAN Shield
182	182	1. Arduino
183	183	1. USB TO TTL Adapter
...	...	@@ -185,6 +185,7 @@
185	185	[[image:image-20220602100052-2.png||height="385" width="600"]]
186	186
187	187
	311	+
188	188	=== 2.8.2  Connection ===
189	189
190	190
...	...	@@ -210,10 +210,11 @@
210	210	[[image:image-20220602102240-4.png||height="304" width="600"]]
211	211
212	212
	337	+
213	213	=== 2.8.3  Upgrade steps ===
214	214
215	215
216		-==== 1.  Switch SW1 to put in ISP position ====
	341	+==== (% style="color:blue" %)1.  Switch SW1 to put in ISP position(%%) ====
217	217
218	218
219	219	[[image:image-20220602102824-5.png||height="306" width="600"]]
...	...	@@ -220,7 +220,7 @@
220	220
221	221
222	222
223		-==== 2.  Press the RST switch once ====
	348	+==== (% style="color:blue" %)2.  Press the RST switch once(%%) ====
224	224
225	225
226	226	[[image:image-20220602104701-12.png||height="285" width="600"]]
...	...	@@ -227,7 +227,7 @@
227	227
228	228
229	229
230		-==== 3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
	355	+==== (% style="color:blue" %)3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade(%%) ====
231	231
232	232
233	233	(((
...	...	@@ -291,21 +291,35 @@
291	291
292	292	== 3.1  Overview ==
293	293
	419	+
294	294	[[image:image-20220715001142-3.png||height="145" width="220"]]
295	295
	422	+
	423	+(((
296	296	(% style="color:blue" %)**LA66 USB LoRaWAN Adapter**(%%) is designed to fast turn USB devices to support LoRaWAN wireless features. It combines a CP2101 USB TTL Chip and LA66 LoRaWAN module which can easy to add LoRaWAN wireless feature to PC / Mobile phone or an embedded device that has USB Interface.
	425	+)))
297	297
298		-(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.4 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
	427	+(((
	428	+(% style="color:blue" %)**LA66**(%%) is a ready-to-use module that includes the (% style="color:blue" %)**LoRaWAN v1.0.3 protocol**(%%). The LoRaWAN stack used in LA66 is used in more than 1 million LoRaWAN End Devices deployed world widely. This mature LoRaWAN stack greatly reduces the risk to make stable LoRaWAN Sensors to support different LoRaWAN servers and different countries' standards. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
	429	+)))
299	299
	431	+(((
300	300	Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
	433	+)))
301	301
	435	+(((
302	302	Besides the support of the LoRaWAN protocol, LA66 also supports (% style="color:blue" %)**open-source peer-to-peer LoRa Protocol**(%%) for the none-LoRaWAN application.
	437	+)))
303	303
	439	+(((
304	304	LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
	441	+)))
305	305
306	306
	444	+
307	307	== 3.2  Features ==
308	308
	447	+
309	309	* LoRaWAN USB adapter base on LA66 LoRaWAN module
310	310	* Ultra-long RF range
311	311	* Support LoRaWAN v1.0.4 protocol
...	...	@@ -318,8 +318,12 @@
318	318	* Firmware upgradable via UART interface
319	319	* Open Source Mobile App for LoRaWAN signal detect and GPS tracking.
320	320
	460	+
	461	+
	462	+
321	321	== 3.3  Specification ==
322	322
	465	+
323	323	* CPU: 32-bit 48 MHz
324	324	* Flash: 256KB
325	325	* RAM: 64KB
...	...	@@ -336,6 +336,9 @@
336	336	* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
337	337	* LoRa Rx current: <9 mA
338	338
	482	+
	483	+
	484	+
339	339	== 3.4  Pin Mapping & LED ==
340	340
341	341
...	...	@@ -343,13 +343,15 @@
343	343	== 3.5  Example: Send & Get Messages via LoRaWAN in PC ==
344	344
345	345
	492	+(((
346	346	Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
	494	+)))
347	347
348	348
349	349	(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN adapter to PC**
350	350
351	351
352		-[[image:image-20220602171217-1.png||height="538" width="800"]]
	500	+[[image:image-20220723100027-1.png]]
353	353
354	354
355	355	Open the serial port tool
...	...	@@ -390,6 +390,7 @@
390	390
391	391	**Use python as an example：**[[https:~~/~~/github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py>>https://github.com/dragino/LA66/blob/main/Send_information_to_TTN_WindosPC.py]]
392	392
	541	+(**Raspberry Pi example: **[[https:~~/~~/github.com/dragino/LA66/blob/main/Send_information_to_TTN_Raspberry%20Pi.py>>https://github.com/dragino/LA66/blob/main/Send_information_to_TTN_Raspberry%20Pi.py]])
393	393
394	394	(% style="color:red" %)**Preconditions:**
395	395
...	...	@@ -417,7 +417,7 @@
417	417
418	418	(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN Adapter to the Raspberry Pi**
419	419
420		-[[image:image-20220602171233-2.png||height="538" width="800"]]
	569	+[[image:image-20220723100439-2.png]]
421	421
422	422
423	423
...	...	@@ -462,18 +462,136 @@
462	462
463	463
464	464
465		-== 3.8  Example: LA66 USB Module got a message from LA66 LoRa Shield and send the sensor data to NodeRed. ==
	614	+== 3.8  Example: Use of LA66 USB LoRaWAN Adapter and mobile APP ==
466	466
467	467
	617	+=== 3.8.1  Hardware and Software Connection ===
468	468
	619	+
	620	+==== (% style="color:blue" %)**Overview：**(%%) ====
	621	+
	622	+
	623	+(((
	624	+DRAGINO-LA66-APP is an Open Source mobile APP for LA66 USB LoRaWAN Adapter. DRAGINO-LA66-APP has below features:
	625	+
	626	+* Send real-time location information of mobile phone to LoRaWAN network.
	627	+* Check LoRaWAN network signal strengh.
	628	+* Manually send messages to LoRaWAN network.
	629	+)))
	630	+
	631	+
	632	+
	633	+==== (% style="color:blue" %)**Hardware Connection:**(%%) ====
	634	+
	635	+A USB to Type-C adapter is needed to connect to a Mobile phone.
	636	+
	637	+Note: The package of LA66 USB adapter already includes this USB Type-C adapter.
	638	+
	639	+[[image:image-20220813174353-2.png||height="360" width="313"]]
	640	+
	641	+
	642	+==== (% style="color:blue" %)**Download and Install App:**(%%) ====
	643	+
	644	+[[(% id="cke_bm_895007S" style="display:none" %)** **(%%)**Download Link for Android apk **>>https://www.dropbox.com/sh/zxwx16qb777uvkz/AABE_P8coGCQ4DAC8enH4bUya?dl=0]].  (Android Version Only)
	645	+
	646	+[[image:image-20220813173738-1.png]]
	647	+
	648	+
	649	+==== (% style="color:blue" %)**Use of APP:**(%%) ====
	650	+
	651	+Function and page introduction
	652	+
	653	+[[image:image-20220723113448-7.png||height="995" width="450"]]
	654	+
	655	+**Block Explain:**
	656	+
	657	+1.  Display LA66 USB LoRaWAN Module connection status
	658	+
	659	+2.  Check and reconnect
	660	+
	661	+3.  Turn send timestamps on or off
	662	+
	663	+4.  Display LoRaWan connection status
	664	+
	665	+5.  Check LoRaWan connection status
	666	+
	667	+6.  The RSSI value of the node when the ACK is received
	668	+
	669	+7.  Node's Signal Strength Icon
	670	+
	671	+8.  Configure Location Uplink Interval
	672	+
	673	+9.  AT command input box
	674	+
	675	+10.  Send Button:  Send input box info to LA66 USB Adapter
	676	+
	677	+11.  Output Log from LA66 USB adapter
	678	+
	679	+12.  clear log button
	680	+
	681	+13.  exit button
	682	+
	683	+
	684	+LA66 USB LoRaWAN Module not connected
	685	+
	686	+[[image:image-20220723110520-5.png||height="677" width="508"]]
	687	+
	688	+
	689	+
	690	+Connect LA66 USB LoRaWAN Module
	691	+
	692	+[[image:image-20220723110626-6.png||height="681" width="511"]]
	693	+
	694	+
	695	+
	696	+=== 3.8.2  Use DRAGINO-LA66-APP to obtain positioning information and send it to TTNV3 through LA66 USB LoRaWAN Adapter and integrate it into Node-RED ===
	697	+
	698	+
	699	+(% style="color:blue" %)**1.  Register LA66 USB LoRaWAN Module to TTNV3**
	700	+
	701	+[[image:image-20220723134549-8.png]]
	702	+
	703	+
	704	+
	705	+(% style="color:blue" %)**2.  Open Node-RED,And import the JSON file to generate the flow**
	706	+
	707	+Sample JSON file please go to **[[this link>>https://www.dropbox.com/sh/zxwx16qb777uvkz/AABE_P8coGCQ4DAC8enH4bUya?dl=0]]** to download.
	708	+
	709	+For the usage of Node-RED, please refer to: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Node-RED/>>http://wiki.dragino.com/xwiki/bin/view/Main/Node-RED/]]
	710	+
	711	+After see LoRaWAN Online, walk around and the APP will keep sending location info to LoRaWAN server and then to the Node Red.
	712	+
	713	+
	714	+Example output in NodeRed is as below:
	715	+
	716	+[[image:image-20220723144339-1.png]]
	717	+
	718	+
	719	+
469	469	== 3.9  Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
470	470
471	471
	723	+The LA66 USB LoRaWAN Adapter is the same as the LA66 LoRaWAN Shield update method
472	472
	725	+Just use the yellow jumper cap to short the BOOT corner and the RX corner, and then press the RESET button (without the jumper cap, you can directly short the BOOT corner and the RX corner with a wire to achieve the same effect)
473	473
474		-= 4.  Order Info =
	727	+[[image:image-20220723150132-2.png]]
475	475
476	476
	730	+
	731	+= 4.  FAQ =
	732	+
	733	+
	734	+== 4.1  How to Compile Source Code for LA66? ==
	735	+
	736	+
	737	+Compile and Upload Code to ASR6601 Platform ：[[Instruction>>Compile and Upload Code to ASR6601 Platform]]
	738	+
	739	+
	740	+
	741	+= 5.  Order Info =
	742	+
	743	+
477	477	**Part Number:**  (% style="color:blue" %)**LA66-XXX**(%%), (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%) **or**  (% style="color:blue" %)**LA66-USB-LoRaWAN-Adapter-XXX**
478	478
479	479
...	...	@@ -489,8 +489,10 @@
489	489	* (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
490	490	* (% style="color:red" %)**PP**(%%):  Peer to Peer LoRa Protocol
491	491
492		-= 5.  Reference =
493	493
494		-* Hardware Design File for LA66 LoRaWAN Shield, LA66 USB LoRaWAN Adapter : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
495	495
496		-
	761	+
	762	+= 6.  Reference =
	763	+
	764	+
	765	+* Hardware Design File for LA66 LoRaWAN Shield, LA66 USB LoRaWAN Adapter : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]

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