Last modified by Xiaoling on 2023/05/26 14:19
<
From version < 4.1 >
edited by Edwin Chen
on 2022/05/17 07:28
To version < 101.1 >
edited by Xiaoling
on 2022/07/20 11:18
>
Change comment: Uploaded new attachment "image-20220720111850-1.png", version {1}

Summary

Details

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1 -XWiki.Edwin
1 +XWiki.Xiaoling
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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 -= What is LA66 LoRaWAN Module =
6 6  
7 -**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 LoRa 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 program, create and connect your things everywhere.
8 8  
9 -**LA66 **is a ready-to-use module which includes the LoRaWAN v1.0.4 protocol. External MCU can use AT command to call LA66 and start to transmit data via the LoRaWAN protocol.
9 += 1.  LA66 LoRaWAN Module =
10 10  
11 -**Each LA66 **module includes a world unique OTAA key for LoRaWAN registration.
12 12  
12 +== 1.1  What is LA66 LoRaWAN Module ==
13 13  
14 14  
15 -== Sub-paragraph ==
15 +(((
16 +(((
17 +[[image:image-20220719093358-2.png||height="145" width="220"]](% style="color:blue" %)** **
18 +)))
16 16  
17 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
20 +(((
21 +
22 +)))
18 18  
19 -== Sub-paragraph ==
24 +(((
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 +)))
27 +)))
20 20  
21 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
29 +(((
30 +(((
31 +(% 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.
32 +)))
33 +)))
22 22  
23 -=== Sub-sub paragraph ===
35 +(((
36 +(((
37 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
38 +)))
24 24  
25 -Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
40 +(((
41 +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.
42 +)))
43 +)))
26 26  
45 +(((
46 +(((
47 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
48 +)))
49 +)))
27 27  
28 -= Specification =
29 29  
30 -[[image:image-20220517072526-1.png]]
31 31  
32 -Input Power Range: 1.8v ~~ 3.7v
53 +== 1.2  Features ==
33 33  
34 -Power Consumption: < 4uA.
55 +* Support LoRaWAN v1.0.4 protocol
56 +* Support peer-to-peer protocol
57 +* TCXO crystal to ensure RF performance on low temperature
58 +* SMD Antenna pad and i-pex antenna connector
59 +* Available in different frequency LoRaWAN frequency bands.
60 +* World-wide unique OTAA keys.
61 +* AT Command via UART-TTL interface
62 +* Firmware upgradable via UART interface
63 +* Ultra-long RF range
35 35  
36 -Frequency Range: 150 MHz ~~ 960 MHz
37 37  
38 -Maximum Power +22 dBm constant RF output
39 39  
40 -High sensitivity: -148 dBm
67 +== 1.3  Specification ==
41 41  
42 -Temperature:
69 +* CPU: 32-bit 48 MHz
70 +* Flash: 256KB
71 +* RAM: 64KB
72 +* Input Power Range: 1.8v ~~ 3.7v
73 +* Power Consumption: < 4uA.
74 +* Frequency Range: 150 MHz ~~ 960 MHz
75 +* Maximum Power +22 dBm constant RF output
76 +* High sensitivity: -148 dBm
77 +* Temperature:
78 +** Storage: -55 ~~ +125℃
79 +** Operating: -40 ~~ +85℃
80 +* Humidity:
81 +** Storage: 5 ~~ 95% (Non-Condensing)
82 +** Operating: 10 ~~ 95% (Non-Condensing)
83 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
84 +* LoRa Rx current: <9 mA
85 +* I/O Voltage: 3.3v
43 43  
44 -* Storage: -55 ~~ +125℃
45 -* Operating: -40 ~~ +85℃
46 46  
47 -Humidity:
48 48  
49 -* Storage: 5 ~~ 95% (Non-Condensing)
50 -* Operating: 10 ~~ 95% (Non-Condensing)
89 +== 1.4  AT Command ==
51 51  
52 -LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
53 53  
54 -LoRa Rx current: <9 mA
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.
55 55  
56 -I/O Voltage: 3.3v
94 +
95 +
96 +== 1.5  Dimension ==
97 +
98 +[[image:image-20220718094750-3.png]]
99 +
100 +
101 +
102 +== 1.6  Pin Mapping ==
103 +
104 +
105 +[[image:image-20220719093156-1.png]]
106 +
107 +
108 +
109 +== 1.7  Land Pattern ==
110 +
111 +[[image:image-20220517072821-2.png]]
112 +
113 +
114 +
115 += 2.  LA66 LoRaWAN Shield =
116 +
117 +
118 +== 2.1  Overview ==
119 +
120 +
121 +(((
122 +[[image:image-20220715000826-2.png||height="145" width="220"]]
123 +)))
124 +
125 +(((
126 +
127 +)))
128 +
129 +(((
130 +(% 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.
131 +)))
132 +
133 +(((
134 +(((
135 +(% 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.
136 +)))
137 +)))
138 +
139 +(((
140 +(((
141 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
142 +)))
143 +)))
144 +
145 +(((
146 +(((
147 +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.
148 +)))
149 +)))
150 +
151 +(((
152 +(((
153 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
154 +)))
155 +)))
156 +
157 +
158 +
159 +== 2.2  Features ==
160 +
161 +* Arduino Shield base on LA66 LoRaWAN module
162 +* Support LoRaWAN v1.0.4 protocol
163 +* Support peer-to-peer protocol
164 +* TCXO crystal to ensure RF performance on low temperature
165 +* SMA connector
166 +* Available in different frequency LoRaWAN frequency bands.
167 +* World-wide unique OTAA keys.
168 +* AT Command via UART-TTL interface
169 +* Firmware upgradable via UART interface
170 +* Ultra-long RF range
171 +
172 +
173 +
174 +== 2.3  Specification ==
175 +
176 +* CPU: 32-bit 48 MHz
177 +* Flash: 256KB
178 +* RAM: 64KB
179 +* Input Power Range: 1.8v ~~ 3.7v
180 +* Power Consumption: < 4uA.
181 +* Frequency Range: 150 MHz ~~ 960 MHz
182 +* Maximum Power +22 dBm constant RF output
183 +* High sensitivity: -148 dBm
184 +* Temperature:
185 +** Storage: -55 ~~ +125℃
186 +** Operating: -40 ~~ +85℃
187 +* Humidity:
188 +** Storage: 5 ~~ 95% (Non-Condensing)
189 +** Operating: 10 ~~ 95% (Non-Condensing)
190 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
191 +* LoRa Rx current: <9 mA
192 +* I/O Voltage: 3.3v
193 +
194 +
195 +
196 +== 2.4  Pin Mapping & LED ==
197 +
198 +
199 +
200 +== 2.5  Example: Use AT Command to communicate with LA66 module via Arduino UNO. ==
201 +
202 +
203 +
204 +== 2.6  Example: Join TTN network and send an uplink message, get downlink message. ==
205 +
206 +
207 +
208 +== 2.7  Example: Log Temperature Sensor(DHT11) and send data to TTN, show it in DataCake. ==
209 +
210 +
211 +
212 +== 2.8  Upgrade Firmware of LA66 LoRaWAN Shield ==
213 +
214 +
215 +=== 2.8.1  Items needed for update ===
216 +
217 +1. LA66 LoRaWAN Shield
218 +1. Arduino
219 +1. USB TO TTL Adapter
220 +
221 +[[image:image-20220602100052-2.png||height="385" width="600"]]
222 +
223 +
224 +=== 2.8.2  Connection ===
225 +
226 +
227 +[[image:image-20220602101311-3.png||height="276" width="600"]]
228 +
229 +
230 +(((
231 +(% style="color:blue" %)**LA66 LoRaWAN Shield**(%%)  **<->** (% style="color:blue" %)**USB TTL**
232 +)))
233 +
234 +(((
235 +(% style="background-color:yellow" %)**GND  <-> GND
236 +TXD  <->  TXD
237 +RXD  <->  RXD**
238 +)))
239 +
240 +
241 +Put a jumper cap on JP6 of LA66 LoRaWAN Shield. ( the jumper is to power on LA66 module)
242 +
243 +Connect USB TTL Adapter to PC after connecting the wires
244 +
245 +
246 +[[image:image-20220602102240-4.png||height="304" width="600"]]
247 +
248 +
249 +=== 2.8.3  Upgrade steps ===
250 +
251 +
252 +==== 1.  Switch SW1 to put in ISP position ====
253 +
254 +
255 +[[image:image-20220602102824-5.png||height="306" width="600"]]
256 +
257 +
258 +
259 +==== 2.  Press the RST switch once ====
260 +
261 +
262 +[[image:image-20220602104701-12.png||height="285" width="600"]]
263 +
264 +
265 +
266 +==== 3.  Open the Upgrade tool (Tremo Programmer) in PC and Upgrade ====
267 +
268 +
269 +(((
270 +(% 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/]]**
271 +)))
272 +
273 +
274 +[[image:image-20220602103227-6.png]]
275 +
276 +
277 +[[image:image-20220602103357-7.png]]
278 +
279 +
280 +
281 +(% class="wikigeneratedid" id="HSelecttheCOMportcorrespondingtoUSBTTL" %)
282 +(% style="color:blue" %)**2. Select the COM port corresponding to USB TTL**
283 +
284 +
285 +[[image:image-20220602103844-8.png]]
286 +
287 +
288 +
289 +(% class="wikigeneratedid" id="HSelectthebinfiletoburn" %)
290 +(% style="color:blue" %)**3. Select the bin file to burn**
291 +
292 +
293 +[[image:image-20220602104144-9.png]]
294 +
295 +
296 +[[image:image-20220602104251-10.png]]
297 +
298 +
299 +[[image:image-20220602104402-11.png]]
300 +
301 +
302 +
303 +(% class="wikigeneratedid" id="HClicktostartthedownload" %)
304 +(% style="color:blue" %)**4. Click to start the download**
305 +
306 +[[image:image-20220602104923-13.png]]
307 +
308 +
309 +
310 +(% class="wikigeneratedid" id="HThefollowingfigureappearstoprovethattheburningisinprogress" %)
311 +(% style="color:blue" %)**5. Check update process**
312 +
313 +
314 +[[image:image-20220602104948-14.png]]
315 +
316 +
317 +
318 +(% class="wikigeneratedid" id="HThefollowingpictureappearstoprovethattheburningissuccessful" %)
319 +(% style="color:blue" %)**The following picture shows that the burning is successful**
320 +
321 +[[image:image-20220602105251-15.png]]
322 +
323 +
324 +
325 += 3.  LA66 USB LoRaWAN Adapter =
326 +
327 +
328 +== 3.1  Overview ==
329 +
330 +
331 +[[image:image-20220715001142-3.png||height="145" width="220"]]
332 +
333 +
334 +(((
335 +(% 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.
336 +)))
337 +
338 +(((
339 +(% 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.
340 +)))
341 +
342 +(((
343 +Each LA66 module includes a (% style="color:blue" %)**world-unique OTAA key**(%%) for LoRaWAN registration.
344 +)))
345 +
346 +(((
347 +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.
348 +)))
349 +
350 +(((
351 +LA66 is equipped with (% style="color:blue" %)**TCXO crystal**(%%) which ensures the module can achieve stable performance in extreme temperatures.
352 +)))
353 +
354 +
355 +
356 +== 3.2  Features ==
357 +
358 +* LoRaWAN USB adapter base on LA66 LoRaWAN module
359 +* Ultra-long RF range
360 +* Support LoRaWAN v1.0.4 protocol
361 +* Support peer-to-peer protocol
362 +* TCXO crystal to ensure RF performance on low temperature
363 +* Spring RF antenna
364 +* Available in different frequency LoRaWAN frequency bands.
365 +* World-wide unique OTAA keys.
366 +* AT Command via UART-TTL interface
367 +* Firmware upgradable via UART interface
368 +* Open Source Mobile App for LoRaWAN signal detect and GPS tracking.
369 +
370 +
371 +
372 +== 3.3  Specification ==
373 +
374 +* CPU: 32-bit 48 MHz
375 +* Flash: 256KB
376 +* RAM: 64KB
377 +* Input Power Range: 5v
378 +* Frequency Range: 150 MHz ~~ 960 MHz
379 +* Maximum Power +22 dBm constant RF output
380 +* High sensitivity: -148 dBm
381 +* Temperature:
382 +** Storage: -55 ~~ +125℃
383 +** Operating: -40 ~~ +85℃
384 +* Humidity:
385 +** Storage: 5 ~~ 95% (Non-Condensing)
386 +** Operating: 10 ~~ 95% (Non-Condensing)
387 +* LoRa Tx Current: <90 mA at +17 dBm, 108 mA at +22 dBm
388 +* LoRa Rx current: <9 mA
389 +
390 +
391 +
392 +== 3.4  Pin Mapping & LED ==
393 +
394 +
395 +
396 +== 3.5  Example: Send & Get Messages via LoRaWAN in PC ==
397 +
398 +
399 +(((
400 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
401 +)))
402 +
403 +
404 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN adapter to PC**
405 +
406 +
407 +[[image:image-20220602171217-1.png||height="538" width="800"]]
408 +
409 +
410 +Open the serial port tool
411 +
412 +[[image:image-20220602161617-8.png]]
413 +
414 +[[image:image-20220602161718-9.png||height="457" width="800"]]
415 +
416 +
417 +
418 +(% style="color:blue" %)**2. Press the reset switch RST on the LA66 USB LoRaWAN Adapter to reset it.**
419 +
420 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully Join the LoRaWAN network
421 +
422 +
423 +[[image:image-20220602161935-10.png||height="498" width="800"]]
424 +
425 +
426 +
427 +(% style="color:blue" %)**3. See Uplink Command**
428 +
429 +Command format: (% style="color:#4472c4" %)** AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
430 +
431 +example: AT+SENDB=01,02,8,05820802581ea0a5
432 +
433 +[[image:image-20220602162157-11.png||height="497" width="800"]]
434 +
435 +
436 +
437 +(% style="color:blue" %)**4. Check to see if TTN received the message**
438 +
439 +[[image:image-20220602162331-12.png||height="420" width="800"]]
440 +
441 +
442 +
443 +== 3.6  Example: Send PC's CPU/RAM usage to TTN via python ==
444 +
445 +
446 +**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]]
447 +
448 +
449 +(% style="color:red" %)**Preconditions:**
450 +
451 +(% style="color:red" %)**1. LA66 USB LoRaWAN Adapter works fine**
452 +
453 +(% style="color:red" %)**2. LA66 USB LoRaWAN Adapter  is registered with TTN**
454 +
455 +
456 +
457 +(% style="color:blue" %)**Steps for usage:**
458 +
459 +(% style="color:blue" %)**1.**(%%) Press the reset switch RESET on the LA66 USB LoRaWAN Adapter
460 +
461 +(% style="color:blue" %)**2.**(%%) Run the python script in PC and see the TTN
462 +
463 +[[image:image-20220602115852-3.png||height="450" width="1187"]]
464 +
465 +
466 +
467 +== 3.7  Example: Send & Get Messages via LoRaWAN in RPi ==
468 +
469 +
470 +Assume user already input the LA66 USB LoRaWAN Adapter OTAA Keys in TTN and there is already TTN network coverage.
471 +
472 +
473 +(% style="color:blue" %)**1. Connect the LA66 USB LoRaWAN Adapter to the Raspberry Pi**
474 +
475 +[[image:image-20220602171233-2.png||height="538" width="800"]]
476 +
477 +
478 +
479 +(% style="color:blue" %)**2. Install Minicom in RPi.**
480 +
481 +(% id="cke_bm_509388S" style="display:none" %) (%%)Enter the following command in the RPi terminal
482 +
483 + (% style="background-color:yellow" %)**apt update**
484 +
485 + (% style="background-color:yellow" %)**apt install minicom**
486 +
487 +
488 +Use minicom to connect to the RPI's terminal
489 +
490 +[[image:image-20220602153146-3.png||height="439" width="500"]]
491 +
492 +
493 +
494 +(% style="color:blue" %)**3. Press the reset switch RST on the LA66 USB LoRaWAN Adapter.**
495 +
496 +The following picture appears to prove that the LA66 USB LoRaWAN Adapter successfully entered the network.
497 +
498 +
499 +[[image:image-20220602154928-5.png||height="436" width="500"]]
500 +
501 +
502 +
503 +(% style="color:blue" %)**4. Send Uplink message**
504 +
505 +Format: (% style="color:#4472c4" %)**AT+SENDB=<confirn_status>,<Fport>,<data_len>,<data>**
506 +
507 +example: AT+SENDB=01,02,8,05820802581ea0a5
508 +
509 +
510 +[[image:image-20220602160339-6.png||height="517" width="600"]]
511 +
512 +
513 +
514 +Check to see if TTN received the message
515 +
516 +[[image:image-20220602160627-7.png||height="369" width="800"]]
517 +
518 +
519 +
520 +== 3.8  Example: LA66 USB Module got a message from LA66 LoRa Shield and send the sensor data to NodeRed. ==
521 +
522 +
523 +
524 +== 3.9  Upgrade Firmware of LA66 USB LoRaWAN Adapter ==
525 +
526 +
527 +
528 +
529 += 4.  Order Info =
530 +
531 +
532 +**Part Number:**  (% style="color:blue" %)**LA66-XXX**(%%), (% style="color:blue" %)**LA66-LoRaWAN-Shield-XXX** (%%) **or**  (% style="color:blue" %)**LA66-USB-LoRaWAN-Adapter-XXX**
533 +
534 +
535 +(% style="color:blue" %)**XXX**(%%): The default frequency band
536 +
537 +* (% style="color:red" %)**AS923**(%%):  LoRaWAN AS923 band
538 +* (% style="color:red" %)**AU915**(%%):  LoRaWAN AU915 band
539 +* (% style="color:red" %)**EU433**(%%):  LoRaWAN EU433 band
540 +* (% style="color:red" %)**EU868**(%%):  LoRaWAN EU868 band
541 +* (% style="color:red" %)**KR920**(%%):  LoRaWAN KR920 band
542 +* (% style="color:red" %)**US915**(%%):  LoRaWAN US915 band
543 +* (% style="color:red" %)**IN865**(%%):  LoRaWAN IN865 band
544 +* (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band
545 +* (% style="color:red" %)**PP**(%%):  Peer to Peer LoRa Protocol
546 +
547 +
548 += 5.  Reference =
549 +
550 +* 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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