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Last modified by Xiaoling on 2023/05/26 14:19
From version 65.1
edited by Edwin Chen
on 2022/07/02 23:30
Change comment: There is no comment for this version
To version 166.3
edited by Xiaoling
on 2023/05/26 13:55
Change comment: There is no comment for this version

Summary

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Title
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1 -LA66 LoRaWAN Module
1 +LA66 LoRaWAN Shield User Manual
Author
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1 -XWiki.Edwin
1 +XWiki.Xiaoling
Content
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1 -{{box cssClass="floatinginfobox" title="**Contents**"}}
1 +
2 +
3 +**Table of Contents:**
4 +
2 2  {{toc/}}
3 -{{/box}}
4 4  
5 -= LA66 LoRaWAN Module =
6 6  
7 -== What is LA66 LoRaWAN Module ==
8 8  
9 -(% 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.
10 10  
11 -(% 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.
10 += 1.  LA66 LoRaWAN Shield =
12 12  
12 +
13 +== 1.1  Overview ==
14 +
15 +
16 +(((
17 +[[image:image-20220715000826-2.png||height="145" width="220"]]
18 +)))
19 +
20 +(((
21 +
22 +)))
23 +
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.
26 +)))
27 +
28 +(((
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 +)))
32 +)))
33 +
34 +(((
35 +(((
13 13  Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
37 +)))
38 +)))
14 14  
40 +(((
41 +(((
15 15  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 +)))
44 +)))
16 16  
46 +(((
47 +(((
17 17  LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
49 +)))
50 +)))
18 18  
19 -== Features ==
20 20  
21 21  
22 -== Specification ==
54 +== 1.2  Features ==
23 23  
24 -[[image:image-20220517072526-1.png]]
25 25  
26 -Input Power Range: 1.8v ~~ 3.7v
57 +* Arduino Shield base on LA66 LoRaWAN module
58 +* Support LoRaWAN v1.0.3 protocol
59 +* Support peer-to-peer protocol
60 +* TCXO crystal to ensure RF performance on low temperature
61 +* SMA connector
62 +* Available in different frequency LoRaWAN frequency bands.
63 +* World-wide unique OTAA keys.
64 +* AT Command via UART-TTL interface
65 +* Firmware upgradable via UART interface
66 +* Ultra-long RF range
27 27  
28 -Power Consumption: < 4uA.
29 29  
30 -Frequency Range: 150 MHz ~~ 960 MHz
69 +== 1.3  Specification ==
31 31  
32 -Maximum Power +22 dBm constant RF output
33 33  
34 -High sensitivity: -148 dBm
72 +* CPU: 32-bit 48 MHz
73 +* Flash: 256KB
74 +* RAM: 64KB
75 +* Input Power Range: 1.8v ~~ 3.7v
76 +* Power Consumption: < 4uA.
77 +* Frequency Range: 150 MHz ~~ 960 MHz
78 +* Maximum Power +22 dBm constant RF output
79 +* High sensitivity: -148 dBm
80 +* Temperature:
81 +** Storage: -55 ~~ +125℃
82 +** Operating: -40 ~~ +85℃
83 +* Humidity:
84 +** Storage: 5 ~~ 95% (Non-Condensing)
85 +** Operating: 10 ~~ 95% (Non-Condensing)
86 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
87 +* LoRa Rx current: <9 mA
88 +* I/O Voltage: 3.3v
35 35  
36 -Temperature:
37 37  
38 -* Storage: -55 ~~ +125℃
39 -* Operating: -40 ~~ +85℃
91 +== 1.4  Pin Mapping & LED ==
40 40  
41 -Humidity:
42 42  
43 -* Storage: 5 ~~ 95% (Non-Condensing)
44 -* Operating: 10 ~~ 95% (Non-Condensing)
94 +[[image:image-20220817085048-1.png||height="533" width="734"]]
45 45  
46 -LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
47 47  
48 -LoRa Rx current: <9 mA
49 49  
50 -I/O Voltage: 3.3v
98 +~1. The LED lights up red when there is an upstream data packet
99 +2. When the network is successfully connected, the green light will be on for 5 seconds
100 +3. Purple light on when receiving downlink data packets
51 51  
52 52  
53 -== AT Command ==
103 +[[image:image-20220820112305-1.png||height="515" width="749"]]
54 54  
55 -AT Command is valid over Main TXD and Main RXD. Serial Baud Rate is 9600. AT commands can be found in AT Command documents.
56 56  
57 57  
58 -== Pin Mapping ==
107 +== 1.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
59 59  
60 -[[image:image-20220523101537-1.png]]
61 61  
62 -== Land Pattern ==
110 +**Show connection diagram：**
63 63  
64 -[[image:image-20220517072821-2.png]]
65 65  
113 +[[image:image-20220723170210-2.png||height="908" width="681"]]
66 66  
67 -== Part Number ==
68 68  
69 -Part Number: **LA66-XXX**
70 70  
71 -**XX**: The default frequency band
117 +(% style="color:blue" %)**1.  open Arduino IDE**
72 72  
73 -* **AS923**: LoRaWAN AS923 band
74 -* **AU915**: LoRaWAN AU915 band
75 -* **EU433**: LoRaWAN EU433 band
76 -* **EU868**: LoRaWAN EU868 band
77 -* **KR920**: LoRaWAN KR920 band
78 -* **US915**: LoRaWAN US915 band
79 -* **IN865**: LoRaWAN IN865 band
80 -* **CN470**: LoRaWAN CN470 band
81 81  
82 -= LA66 LoRaWAN Shield =
120 +[[image:image-20220723170545-4.png]]
83 83  
84 -LA66 LoRaWAN Shield is the Arduino Breakout PCB to fast test the features of LA66 module and turn Arduino to support LoRaWAN.
85 85  
86 -== Pin Mapping & LED ==
87 87  
88 -== Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
124 +(% style="color:blue" %)**2.  Open project**
89 89  
90 -== Example: Join TTN network and send an uplink message, get downlink message. ==
91 91  
92 -== Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in DataCake. ==
127 +LA66-LoRaWAN-shield-AT-command-via-Arduino-UNO source code link: [[https:~~/~~/www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0 >>https://www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0]]
93 93  
94 -== Upgrade Firmware of LA66 LoRaWAN Shield ==
129 +[[image:image-20220726135239-1.png]]
95 95  
96 -=== what needs to be used ===
97 97  
98 -1.LA66 LoRaWAN Shield that needs to be upgraded
99 99  
100 -2.Arduino
133 +(% 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**
101 101  
102 -3.USB TO TTL
103 103  
104 -[[image:image-20220602100052-2.png]]
136 +[[image:image-20220726135356-2.png]]
105 105  
106 -=== Wiring Schematic ===
107 107  
108 -[[image:image-20220602101311-3.png]]
109 109  
110 -LA66 LoRaWAN Shield  >>>>>>>>>>>>USB TTL
140 +(% style="color:blue" %)**4.  After the upload is successful, open the serial port monitoring and send the AT command**
111 111  
112 -GND  >>>>>>>>>>>>GND
113 113  
114 -TXD  >>>>>>>>>>>>TXD
143 +[[image:image-20220723172235-7.png||height="480" width="1027"]]
115 115  
116 -RXD  >>>>>>>>>>>>RXD
117 117  
118 -JP6 of LA66 LoRaWAN Shield needs to be connected with yellow jumper cap
119 119  
120 -Connect to the PC after connecting the wires
147 +== 1.6  Example: Join TTN network and send an uplink message, get downlink message. ==
121 121  
122 -[[image:image-20220602102240-4.png]]
123 123  
124 -=== Upgrade steps ===
150 +(% style="color:blue" %)**1.  Open project**
125 125  
126 -==== Dial the SW1 of the LA66 LoRaWAN Shield to the ISP's location as shown in the figure below ====
127 127  
128 -[[image:image-20220602102824-5.png]]
153 +Join-TTN-network source code link: [[https:~~/~~/www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0 >>https://www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0]]
129 129  
130 -==== Press the RST switch on the LA66 LoRaWAN Shield once ====
131 131  
132 -[[image:image-20220602104701-12.png]]
156 +[[image:image-20220723172502-8.png]]
133 133  
134 -==== Open the upgrade application software ====
135 135  
136 -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/]]
137 137  
160 +(% style="color:blue" %)**2.  Same steps as 1.5,after opening the serial port monitoring, it will automatically connect to the network and send packets**
161 +
162 +
163 +[[image:image-20220723172938-9.png||height="652" width="1050"]]
164 +
165 +
166 +
167 +== 1.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in Node-RED. ==
168 +
169 +
170 +(% style="color:blue" %)**1.  Open project**
171 +
172 +
173 +Log-Temperature-Sensor-and-send-data-to-TTN source code link: [[https:~~/~~/www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0>>https://www.dropbox.com/sh/hgtycj0go4tka2r/AAACRRIRriMAudB2m3ThH7Sba?dl=0]]
174 +
175 +
176 +[[image:image-20220723173341-10.png||height="581" width="1014"]]
177 +
178 +
179 +
180 +(% 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**
181 +
182 +
183 +[[image:image-20220723173950-11.png||height="665" width="1012"]]
184 +
185 +
186 +
187 +
188 +
189 +(% style="color:blue" %)**3.  Integration into Node-red via TTNV3**
190 +
191 +
192 +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/]]
193 +
194 +
195 +[[image:image-20220723175700-12.png||height="602" width="995"]]
196 +
197 +
198 +
199 +== 1.8  Example: How to join helium ==
200 +
201 +
202 +(% style="color:blue" %)**1.  Create a new device.**
203 +
204 +
205 +[[image:image-20220907165500-1.png||height="464" width="940"]]
206 +
207 +
208 +
209 +(% style="color:blue" %)**2.  Save the device after filling in the necessary information.**
210 +
211 +
212 +[[image:image-20220907165837-2.png||height="375" width="809"]]
213 +
214 +
215 +
216 +(% style="color:blue" %)**3.  Use AT commands.**
217 +
218 +
219 +[[image:image-20220602100052-2.png||height="385" width="600"]]
220 +
221 +
222 +
223 +(% style="color:#0000ff" %)**4.  Use command AT+CFG to get device configuration**
224 +
225 +
226 +[[image:image-20220907170308-3.png||height="556" width="617"]]
227 +
228 +
229 +
230 +(% style="color:blue" %)**5.  Network successfully.**
231 +
232 +
233 +[[image:image-20220907170436-4.png]]
234 +
235 +
236 +
237 +(% style="color:blue" %)**6.  Send uplink using command**
238 +
239 +
240 +[[image:image-20220912084334-1.png]]
241 +
242 +
243 +[[image:image-20220912084412-3.png]]
244 +
245 +
246 +
247 +[[image:image-20220907170744-6.png||height="242" width="798"]]
248 +
249 +
250 +
251 +== 1.9  Upgrade Firmware of LA66 LoRaWAN Shield ==
252 +
253 +
254 +=== 1.9.1  Items needed for update ===
255 +
256 +
257 +1. LA66 LoRaWAN Shield
258 +1. Arduino
259 +1. USB TO TTL Adapter
260 +
261 +[[image:image-20220602100052-2.png||height="385" width="600"]]
262 +
263 +
264 +
265 +=== 1.9.2  Connection ===
266 +
267 +
268 +[[image:image-20220602101311-3.png||height="276" width="600"]]
269 +
270 +
271 +(((
272 +(% style="color:blue" %)**LA66 LoRaWAN Shield**(%%)  **<->** (% style="color:blue" %)**USB TTL**
273 +)))
274 +
275 +(((
276 +(% style="background-color:yellow" %)**GND  <-> GND
277 +TXD  <->  TXD
278 +RXD  <->  RXD**
279 +)))
280 +
281 +
282 +Put a jumper cap on JP6 of LA66 LoRaWAN Shield. ( the jumper is to power on LA66 module)
283 +
284 +Connect USB TTL Adapter to PC after connecting the wires
285 +
286 +
287 +[[image:image-20220602102240-4.png||height="304" width="600"]]
288 +
289 +
290 +
291 +=== 1.9.3  Upgrade steps ===
292 +
293 +
294 +
295 +==== (% style="color:blue" %)**1.  Switch SW1 to put in ISP position**(%%) ====
296 +
297 +
298 +[[image:image-20220602102824-5.png||height="306" width="600"]]
299 +
300 +
301 +
302 +
303 +==== (% style="color:blue" %)**2.  Press the RST switch once**(%%) ====
304 +
305 +
306 +[[image:image-20220817085447-1.png]]
307 +
308 +
309 +
310 +
311 +==== (% style="color:blue" %)**3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade**(%%) ====
312 +
313 +
314 +
315 +(((
316 +(% style="color:blue" %)**1.  Software download link:  **(%%)**[[https:~~/~~/www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0>>https://www.dropbox.com/sh/j0qyc7a9ejit7jk/AACtx2tK4gEv6YFXMIVUM4dLa?dl=0]]**
317 +)))
318 +
319 +
138 138  [[image:image-20220602103227-6.png]]
139 139  
322 +
140 140  [[image:image-20220602103357-7.png]]
141 141  
142 -===== Select the COM port corresponding to USB TTL =====
143 143  
326 +
327 +(% class="wikigeneratedid" id="HSelecttheCOMportcorrespondingtoUSBTTL" %)
328 +(% style="color:blue" %)**2.  Select the COM port corresponding to USB TTL**
329 +
330 +
144 144  [[image:image-20220602103844-8.png]]
145 145  
146 -===== Select the bin file to burn =====
147 147  
148 -[[image:image-20220602104144-9.png]]
149 149  
150 -[[image:image-20220602104251-10.png]]
335 +(% class="wikigeneratedid" id="HSelectthebinfiletoburn" %)
336 +(% style="color:blue" %)**3.  Select the bin file to burn**
151 151  
152 -[[image:image-20220602104402-11.png]]
153 153  
154 -===== Click to start the download =====
339 +[[image:image-20220602104144-9.png]]
155 155  
156 -[[image:image-20220602104923-13.png]]
157 157  
158 -===== The following figure appears to prove that the burning is in progress =====
342 +[[image:image-20220602104251-10.png]]
159 159  
160 -[[image:image-20220602104948-14.png]]
161 161  
162 -===== The following picture appears to prove that the burning is successful =====
345 +[[image:image-20220602104402-11.png]]
163 163  
164 -[[image:image-20220602105251-15.png]]
165 165  
166 -= LA66 USB LoRaWAN Adapter =
167 167  
168 -LA66 USB LoRaWAN Adapter is the USB Adapter for LA66, it combines a USB TTL Chip and LA66 module which can easy to test the LoRaWAN feature by using PC or embedded device which has USB Interface.
349 +(% class="wikigeneratedid" id="HClicktostartthedownload" %)
350 +(% style="color:blue" %)**4.  Click to start the download**
169 169  
170 -Before use, please make sure that the computer has installed the CP2102 driver
171 171  
172 -== Pin Mapping & LED ==
353 +[[image:image-20220602104923-13.png]]
173 173  
174 -== Example Send & Get Messages via LoRaWAN in PC ==
175 175  
176 -Connect the LA66 LoRa Shield to the PC
177 177  
178 -[[image:image-20220602171217-1.png||height="615" width="915"]]
357 +(% class="wikigeneratedid" id="HThefollowingfigureappearstoprovethattheburningisinprogress" %)
358 +(% style="color:blue" %)**5.  Check update process**
179 179  
180 -Open the serial port tool
181 181  
182 -[[image:image-20220602161617-8.png]]
361 +[[image:image-20220602104948-14.png]]
183 183  
184 -[[image:image-20220602161718-9.png||height="529" width="927"]]
185 185  
186 -Press the reset switch RST on the LA66 LoRa Shield.
187 187  
188 -The following picture appears to prove that the LA66 LoRa Shield successfully entered the network
365 +(% class="wikigeneratedid" id="HThefollowingpictureappearstoprovethattheburningissuccessful" %)
366 +(% style="color:blue" %)**The following picture shows that the burning is successful**
189 189  
190 -[[image:image-20220602161935-10.png]]
191 191  
192 -send instructions: AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>
369 +[[image:image-20220602105251-15.png]]
193 193  
194 -example: AT+SENDB=01,02,8,05820802581ea0a5
195 195  
196 -[[image:image-20220602162157-11.png]]
197 197  
198 -Check to see if TTN received the message
373 += 2.  FAQ =
199 199  
200 -[[image:image-20220602162331-12.png||height="547" width="1044"]]
375 +== 2.1  How to Compile Source Code for LA66? ==
201 201  
202 -== Example Send & Get Messages via LoRaWAN in RPi ==
203 203  
204 -Connect the LA66 LoRa Shield to the RPI
378 +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]]
205 205  
206 -[[image:image-20220602171233-2.png||height="592" width="881"]]
207 207  
208 -Log in to the RPI's terminal and connect to the serial port
209 209  
210 -[[image:image-20220602153146-3.png]]
382 +== 2.2  Where to find Peer-to-Peer firmware of LA66? ==
211 211  
212 -Press the reset switch RST on the LA66 LoRa Shield.
213 -The following picture appears to prove that the LA66 LoRa Shield successfully entered the network
214 214  
215 -[[image:image-20220602154928-5.png]]
385 +Instruction for LA66 Peer to Peer firmware :[[ Instruction >>doc:.Instruction for LA66 Peer to Peer firmware.WebHome]]
216 216  
217 -send instructions: AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>
387 += 3.  Order Info =
218 218  
219 -example: AT+SENDB=01,02,8,05820802581ea0a5
220 220  
221 -[[image:image-20220602160339-6.png]]
390 +**Part Number:**   (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%)
222 222  
223 -Check to see if TTN received the message
224 224  
225 -[[image:image-20220602160627-7.png||height="468" width="1013"]]
393 +(% style="color:blue" %)**XXX**(%%): The default frequency band
226 226  
227 -=== Install Minicom ===
395 +* (% style="color:red" %)**AS923**(%%):  LoRaWAN AS923 band
396 +* (% style="color:red" %)**AU915**(%%):  LoRaWAN AU915 band
397 +* (% style="color:red" %)**EU433**(%%):  LoRaWAN EU433 band
398 +* (% style="color:red" %)**EU868**(%%):  LoRaWAN EU868 band
399 +* (% style="color:red" %)**KR920**(%%):  LoRaWAN KR920 band
400 +* (% style="color:red" %)**US915**(%%):  LoRaWAN US915 band
401 +* (% style="color:red" %)**IN865**(%%):  LoRaWAN IN865 band
402 +* (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
403 +* (% style="color:red" %)**PP**(%%):  Peer to Peer LoRa Protocol
228 228  
229 -Enter the following command in the RPI terminal
230 230  
231 -apt update
406 += 4.  Reference =
232 232  
233 -[[image:image-20220602143155-1.png]]
234 234  
235 -apt install minicom
409 +* Hardware Design File for LA66 LoRaWAN Shield : [[Download>>https://www.dropbox.com/sh/a3wbmdcvqjxaqw5/AADZfvAiykJTK624RgMquH86a?dl=0]]
236 236  
237 -[[image:image-20220602143744-2.png]]
238 238  
239 -=== Send PC's CPU/RAM usage to TTN via script. ===
412 += 5.  FCC Statement =
240 240  
241 -==== Take python as an example： ====
242 242  
243 -===== Preconditions: =====
415 +(% style="color:red" %)**FCC Caution:**
244 244  
245 -1.LA66 USB LoRaWAN Adapter works fine
417 +Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
246 246  
247 -2.LA66 USB LoRaWAN Adapter  is registered with TTN
419 +This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
248 248  
249 -===== Steps for usage =====
250 250  
251 -1.Press the reset switch RESET on the LA66 USB LoRaWAN Adapter
422 +(% style="color:red" %)**IMPORTANT NOTE: **
252 252  
253 -2.Run the script and see the TTN
424 +(% style="color:red" %)**Note:**(%%) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
254 254  
255 -[[image:image-20220602115852-3.png]]
426 +—Reorient or relocate the receiving antenna.
256 256  
428 +—Increase the separation between the equipment and receiver.
257 257  
430 +—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
258 258  
259 -== Example: LA66 USB Module got a message from LA66 LoRa Shield and send the sensor data to NodeRed. ==
432 +—Consult the dealer or an experienced radio/TV technician for help.
260 260  
261 261  
262 -== Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
435 +(% style="color:red" %)**FCC Radiation Exposure Statement: **
263 263  
264 -
437 +This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.This equipment should be installed and operated with minimum distance 20cm between the radiator& your body. 
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