Last modified by Xiaoling on 2023/05/26 14:19
<
From version < 148.4 >
edited by Xiaoling
on 2022/08/17 08:56
To version < 104.1 >
edited by Herong Lu
on 2022/07/23 10:20
>
Change comment: Uploaded new attachment "image-20220723102027-3.png", version {1}

Summary

Details

Page properties
Title
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1 -LA66 LoRaWAN Shield User Manual
1 +LA66 LoRaWAN Module
Author
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1 -XWiki.Xiaoling
1 +XWiki.Lu
Content
... ... @@ -6,15 +6,15 @@
6 6  
7 7  
8 8  
9 += 1.  LA66 LoRaWAN Module =
9 9  
10 -= 1.  LA66 LoRaWAN Shield =
11 11  
12 +== 1.1  What is LA66 LoRaWAN Module ==
12 12  
13 -== 1.1  Overview ==
14 14  
15 -
16 16  (((
17 -[[image:image-20220715000826-2.png||height="145" width="220"]]
16 +(((
17 +[[image:image-20220719093358-2.png||height="145" width="220"]](% style="color:blue" %)** **
18 18  )))
19 19  
20 20  (((
... ... @@ -22,12 +22,13 @@
22 22  )))
23 23  
24 24  (((
25 -(% 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.
25 +(% 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.
26 26  )))
27 +)))
27 27  
28 28  (((
29 29  (((
30 -(% 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.
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.
31 31  )))
32 32  )))
33 33  
... ... @@ -35,10 +35,8 @@
35 35  (((
36 36  Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
37 37  )))
38 -)))
39 39  
40 40  (((
41 -(((
42 42  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.
43 43  )))
44 44  )))
... ... @@ -53,12 +53,10 @@
53 53  
54 54  == 1.2  Features ==
55 55  
56 -
57 -* Arduino Shield base on LA66 LoRaWAN module
58 -* Support LoRaWAN v1.0.3 protocol
55 +* Support LoRaWAN v1.0.4 protocol
59 59  * Support peer-to-peer protocol
60 60  * TCXO crystal to ensure RF performance on low temperature
61 -* SMA connector
58 +* SMD Antenna pad and i-pex antenna connector
62 62  * Available in different frequency LoRaWAN frequency bands.
63 63  * World-wide unique OTAA keys.
64 64  * AT Command via UART-TTL interface
... ... @@ -67,10 +67,8 @@
67 67  
68 68  
69 69  
70 -
71 71  == 1.3  Specification ==
72 72  
73 -
74 74  * CPU: 32-bit 48 MHz
75 75  * Flash: 256KB
76 76  * RAM: 64KB
... ... @@ -91,110 +91,133 @@
91 91  
92 92  
93 93  
89 +== 1.4  AT Command ==
94 94  
95 -== 1.4  Pin Mapping & LED ==
96 96  
92 +AT Command is valid over Main TXD and Main RXD. Serial Baud Rate is 9600. AT commands can be found in AT Command documents.
97 97  
98 -[[image:image-20220817085048-1.png]]
99 99  
100 100  
101 -~1. The LED lights up red when there is an upstream data packet
102 -2. When the network is successfully connected, the green light will be on for 5 seconds
103 -3. Purple light on when receiving downlink data packets
96 +== 1.5  Dimension ==
104 104  
98 +[[image:image-20220718094750-3.png]]
105 105  
106 106  
107 -== 1.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
108 108  
102 +== 1.6  Pin Mapping ==
109 109  
110 -**Show connection diagram：**
104 +[[image:image-20220720111850-1.png]]
111 111  
112 112  
113 -[[image:image-20220723170210-2.png||height="908" width="681"]]
114 114  
108 +== 1.7  Land Pattern ==
115 115  
110 +[[image:image-20220517072821-2.png]]
116 116  
117 -(% style="color:blue" %)**1.  open Arduino IDE**
118 118  
119 119  
120 -[[image:image-20220723170545-4.png]]
114 += 2.  LA66 LoRaWAN Shield =
121 121  
122 122  
117 +== 2.1  Overview ==
123 123  
124 -(% style="color:blue" %)**2.  Open project**
125 125  
120 +(((
121 +[[image:image-20220715000826-2.png||height="145" width="220"]]
122 +)))
126 126  
127 -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]]
124 +(((
125 +
126 +)))
128 128  
129 -[[image:image-20220726135239-1.png]]
128 +(((
129 +(% 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.
130 +)))
130 130  
132 +(((
133 +(((
134 +(% 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.
135 +)))
136 +)))
131 131  
132 -(% 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**
138 +(((
139 +(((
140 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
141 +)))
142 +)))
133 133  
134 -[[image:image-20220726135356-2.png]]
144 +(((
145 +(((
146 +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.
147 +)))
148 +)))
135 135  
150 +(((
151 +(((
152 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
153 +)))
154 +)))
136 136  
137 -(% style="color:blue" %)**4.  After the upload is successful, open the serial port monitoring and send the AT command**
138 138  
139 139  
140 -[[image:image-20220723172235-7.png||height="480" width="1027"]]
158 +== 2.2  Features ==
141 141  
160 +* Arduino Shield base on LA66 LoRaWAN module
161 +* Support LoRaWAN v1.0.4 protocol
162 +* Support peer-to-peer protocol
163 +* TCXO crystal to ensure RF performance on low temperature
164 +* SMA connector
165 +* Available in different frequency LoRaWAN frequency bands.
166 +* World-wide unique OTAA keys.
167 +* AT Command via UART-TTL interface
168 +* Firmware upgradable via UART interface
169 +* Ultra-long RF range
142 142  
143 143  
144 -== 1.6  Example: Join TTN network and send an uplink message, get downlink message. ==
145 145  
173 +== 2.3  Specification ==
146 146  
147 -(% style="color:blue" %)**1.  Open project**
175 +* CPU: 32-bit 48 MHz
176 +* Flash: 256KB
177 +* RAM: 64KB
178 +* Input Power Range: 1.8v ~~ 3.7v
179 +* Power Consumption: < 4uA.
180 +* Frequency Range: 150 MHz ~~ 960 MHz
181 +* Maximum Power +22 dBm constant RF output
182 +* High sensitivity: -148 dBm
183 +* Temperature:
184 +** Storage: -55 ~~ +125℃
185 +** Operating: -40 ~~ +85℃
186 +* Humidity:
187 +** Storage: 5 ~~ 95% (Non-Condensing)
188 +** Operating: 10 ~~ 95% (Non-Condensing)
189 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
190 +* LoRa Rx current: <9 mA
191 +* I/O Voltage: 3.3v
148 148  
149 149  
150 -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]]
151 151  
195 +== 2.4  Pin Mapping & LED ==
152 152  
153 -[[image:image-20220723172502-8.png]]
154 154  
155 155  
199 +== 2.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
156 156  
157 -(% 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**
158 158  
159 159  
160 -[[image:image-20220723172938-9.png||height="652" width="1050"]]
203 +== 2.6  Example: Join TTN network and send an uplink message, get downlink message. ==
161 161  
162 162  
163 163  
164 -== 1.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in Node-RED. ==
207 +== 2.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in DataCake. ==
165 165  
166 166  
167 -(% style="color:blue" %)**1.  Open project**
168 168  
211 +== 2.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
169 169  
170 -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]]
171 171  
214 +=== 2.8.1  Items needed for update ===
172 172  
173 -[[image:image-20220723173341-10.png||height="581" width="1014"]]
174 -
175 -
176 -
177 -(% 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**
178 -
179 -
180 -[[image:image-20220723173950-11.png||height="665" width="1012"]]
181 -
182 -
183 -
184 -(% style="color:blue" %)**3.  Integration into Node-red via TTNV3**
185 -
186 -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/]]
187 -
188 -[[image:image-20220723175700-12.png||height="602" width="995"]]
189 -
190 -
191 -
192 -== 1.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
193 -
194 -
195 -=== 1.8.1  Items needed for update ===
196 -
197 -
198 198  1. LA66 LoRaWAN Shield
199 199  1. Arduino
200 200  1. USB TO TTL Adapter
... ... @@ -202,10 +202,9 @@
202 202  [[image:image-20220602100052-2.png||height="385" width="600"]]
203 203  
204 204  
223 +=== 2.8.2  Connection ===
205 205  
206 -=== 1.8.2  Connection ===
207 207  
208 -
209 209  [[image:image-20220602101311-3.png||height="276" width="600"]]
210 210  
211 211  
... ... @@ -228,29 +228,26 @@
228 228  [[image:image-20220602102240-4.png||height="304" width="600"]]
229 229  
230 230  
248 +=== 2.8.3  Upgrade steps ===
231 231  
232 -=== 1.8.3  Upgrade steps ===
233 233  
251 +==== 1.  Switch SW1 to put in ISP position ====
234 234  
235 235  
236 -==== (% style="color:blue" %)1.  Switch SW1 to put in ISP position(%%) ====
237 -
238 -
239 239  [[image:image-20220602102824-5.png||height="306" width="600"]]
240 240  
241 241  
242 242  
243 -==== (% style="color:blue" %)2.  Press the RST switch once(%%) ====
258 +==== 2.  Press the RST switch once ====
244 244  
245 245  
246 -[[image:image-20220817085447-1.png]]
261 +[[image:image-20220602104701-12.png||height="285" width="600"]]
247 247  
248 248  
249 249  
265 +==== 3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
250 250  
251 -==== (% style="color:blue" %)3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade(%%) ====
252 252  
253 -
254 254  (((
255 255  (% style="color:blue" %)**1. Software download link:  [[https:~~/~~/www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Utility/LSN50N/>>https://www.dragino.com/downloads/index.php?dir=LSN50-LoRaST/Utility/LSN50N/]]**
256 256  )))
... ... @@ -307,22 +307,216 @@
307 307  
308 308  
309 309  
310 -= 2.  FAQ =
324 += 3.  LA66 USB LoRaWAN Adapter =
311 311  
312 312  
313 -== 2.1  How to Compile Source Code for LA66? ==
327 +== 3.1  Overview ==
314 314  
315 315  
316 -Compile and Upload Code to ASR6601 Platform ：[[Instruction>>Main.User Manual for LoRaWAN End Nodes.LA66 LoRaWAN Module.Compile and Upload Code to ASR6601 Platform.WebHome]]
330 +[[image:image-20220715001142-3.png||height="145" width="220"]]
317 317  
318 318  
333 +(((
334 +(% 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.
335 +)))
319 319  
320 -= 3.  Order Info =
337 +(((
338 +(% 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.
339 +)))
321 321  
341 +(((
342 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
343 +)))
322 322  
323 -**Part Number:**   (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%)
345 +(((
346 +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.
347 +)))
324 324  
349 +(((
350 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
351 +)))
325 325  
353 +
354 +
355 +== 3.2  Features ==
356 +
357 +* LoRaWAN USB adapter base on LA66 LoRaWAN module
358 +* Ultra-long RF range
359 +* Support LoRaWAN v1.0.4 protocol
360 +* Support peer-to-peer protocol
361 +* TCXO crystal to ensure RF performance on low temperature
362 +* Spring RF antenna
363 +* Available in different frequency LoRaWAN frequency bands.
364 +* World-wide unique OTAA keys.
365 +* AT Command via UART-TTL interface
366 +* Firmware upgradable via UART interface
367 +* Open Source Mobile App for LoRaWAN signal detect and GPS tracking.
368 +
369 +
370 +
371 +== 3.3  Specification ==
372 +
373 +* CPU: 32-bit 48 MHz
374 +* Flash: 256KB
375 +* RAM: 64KB
376 +* Input Power Range: 5v
377 +* Frequency Range: 150 MHz ~~ 960 MHz
378 +* Maximum Power +22 dBm constant RF output
379 +* High sensitivity: -148 dBm
380 +* Temperature:
381 +** Storage: -55 ~~ +125℃
382 +** Operating: -40 ~~ +85℃
383 +* Humidity:
384 +** Storage: 5 ~~ 95% (Non-Condensing)
385 +** Operating: 10 ~~ 95% (Non-Condensing)
386 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
387 +* LoRa Rx current: <9 mA
388 +
389 +
390 +
391 +== 3.4  Pin Mapping & LED ==
392 +
393 +
394 +
395 +== 3.5  Example: Send & Get Messages via LoRaWAN in PC ==
396 +
397 +
398 +(((
399 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
400 +)))
401 +
402 +
403 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN adapter to PC**
404 +
405 +
406 +[[image:image-20220602171217-1.png||height="538" width="800"]]
407 +
408 +
409 +Open the serial port tool
410 +
411 +[[image:image-20220602161617-8.png]]
412 +
413 +[[image:image-20220602161718-9.png||height="457" width="800"]]
414 +
415 +
416 +
417 +(% style="color:blue" %)**2. Press the reset switch RST on the LA66 USB LoRaWAN Adapter to reset it.**
418 +
419 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully Join the LoRaWAN network
420 +
421 +
422 +[[image:image-20220602161935-10.png||height="498" width="800"]]
423 +
424 +
425 +
426 +(% style="color:blue" %)**3. See Uplink Command**
427 +
428 +Command format: (% style="color:#4472c4" %)** AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
429 +
430 +example: AT+SENDB=01,02,8,05820802581ea0a5
431 +
432 +[[image:image-20220602162157-11.png||height="497" width="800"]]
433 +
434 +
435 +
436 +(% style="color:blue" %)**4. Check to see if TTN received the message**
437 +
438 +[[image:image-20220602162331-12.png||height="420" width="800"]]
439 +
440 +
441 +
442 +== 3.6  Example: Send PC's CPU/RAM usage to TTN via python ==
443 +
444 +
445 +**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]]
446 +
447 +
448 +(% style="color:red" %)**Preconditions:**
449 +
450 +(% style="color:red" %)**1. LA66 USB LoRaWAN Adapter works fine**
451 +
452 +(% style="color:red" %)**2. LA66 USB LoRaWAN Adapter  is registered with TTN**
453 +
454 +
455 +
456 +(% style="color:blue" %)**Steps for usage:**
457 +
458 +(% style="color:blue" %)**1.**(%%) Press the reset switch RESET on the LA66 USB LoRaWAN Adapter
459 +
460 +(% style="color:blue" %)**2.**(%%) Run the python script in PC and see the TTN
461 +
462 +[[image:image-20220602115852-3.png||height="450" width="1187"]]
463 +
464 +
465 +
466 +== 3.7  Example: Send & Get Messages via LoRaWAN in RPi ==
467 +
468 +
469 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
470 +
471 +
472 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN Adapter to the Raspberry Pi**
473 +
474 +[[image:image-20220602171233-2.png||height="538" width="800"]]
475 +
476 +
477 +
478 +(% style="color:blue" %)**2. Install Minicom in RPi.**
479 +
480 +(% id="cke_bm_509388S" style="display:none" %) (%%)Enter the following command in the RPi terminal
481 +
482 + (% style="background-color:yellow" %)**apt update**
483 +
484 + (% style="background-color:yellow" %)**apt install minicom**
485 +
486 +
487 +Use minicom to connect to the RPI's terminal
488 +
489 +[[image:image-20220602153146-3.png||height="439" width="500"]]
490 +
491 +
492 +
493 +(% style="color:blue" %)**3. Press the reset switch RST on the LA66 USB LoRaWAN Adapter.**
494 +
495 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully entered the network.
496 +
497 +
498 +[[image:image-20220602154928-5.png||height="436" width="500"]]
499 +
500 +
501 +
502 +(% style="color:blue" %)**4. Send Uplink message**
503 +
504 +Format: (% style="color:#4472c4" %)**AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
505 +
506 +example: AT+SENDB=01,02,8,05820802581ea0a5
507 +
508 +
509 +[[image:image-20220602160339-6.png||height="517" width="600"]]
510 +
511 +
512 +
513 +Check to see if TTN received the message
514 +
515 +[[image:image-20220602160627-7.png||height="369" width="800"]]
516 +
517 +
518 +
519 +== 3.8  Example: LA66 USB Module got a message from LA66 LoRa Shield and send the sensor data to NodeRed. ==
520 +
521 +
522 +
523 +== 3.9  Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
524 +
525 +
526 +
527 +
528 += 4.  Order Info =
529 +
530 +
531 +**Part Number:**  (% style="color:blue" %)**LA66-XXX**(%%), (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%) **or**  (% style="color:blue" %)**LA66-USB-LoRaWAN-Adapter-XXX**
532 +
533 +
326 326  (% style="color:blue" %)**XXX**(%%): The default frequency band
327 327  
328 328  * (% style="color:red" %)**AS923**(%%):  LoRaWAN AS923 band
... ... @@ -335,11 +335,6 @@
335 335  * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
336 336  * (% style="color:red" %)**PP**(%%):  Peer to Peer LoRa Protocol
337 337  
546 += 5.  Reference =
338 338  
339 -
340 -= 4.  Reference =
341 -
342 -
343 -* Hardware Design File for LA66 LoRaWAN Shield : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
344 -
345 -
548 +* 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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