Hello I am new working in Lora and I have acquired a RAK811 Breakout Module equipment I have seen that it works with AT command, I want to use the RAK811 as a slave of the Arduino Uno is this possible?
Thanks for your help
Hello I am new working in Lora and I have acquired a RAK811 Breakout Module equipment I have seen that it works with AT command, I want to use the RAK811 as a slave of the Arduino Uno is this possible?
Thanks for your help
Welcome to RAK forum @bmadriz .
You can use your RAK811 Breakout Board with Arduino Uno. You can use this library GitHub - RAKWireless/WisNode-Arduino-Library: This repo is used for Arduino board + WisNode-LoRa RAK811 board.
Dear @carlrowan,
Thank you very much for your reply.
The Arduino Uno must have some specific scketch loaded to be able to apply the AT commands ?
Yes. You can actually create your own sketch. Or you can use the library link I posted above.
RAK811 signals are 3.3V signals. If you use a Arduino UNO, the Uart lines RX and TX are 5V. You need a level shifter between the RAK811 and the Arduino Uno.
@beegee and @carlrowan ,
I don’t have a level shifter, but I have an ESP8266 I think I could try with this one, it is already 3.3v.
I have made the following connection (see images) and loaded the script: WisNode-Arduino-Library/Arduino-RAK811-Library/examples/JoinNetworkOTAA at master · RAKWireless/WisNode-Arduino-Library · GitHub
ESP8266
RAK811
But I get the message: set work_mode failed, please reset module.
Few things you need to check.
at+set_config=device:uart:1:9600
command. The reason behind this is the SW serial library of Arduino UNO wont work at 115200 baud rate.Btw, at 9600 baud rate. You can use voltage divider on the RX side of the RAK811. UART lines are not bidirectional so you can just use voltage divider no mosfet or ic shifters. 9600 is not really fast as long as you don’t use too big resistors for the divider. 1k range should be fine.
The disadvantages of course are extra components and little power dissipation. Advantage is you can just use the Arduino UNO library directly.
That chestnut that maybe @carlrowan could remove from the repository is due to the library issuing a set work mode command which then requires the module to be reset but without a reset connection, that won’t happen and it all grinds to a halt.
I personally configure the basics using the Serial Tool and I don’t use that command in the script as the module will remember the settings.
PS, if you are getting stuck with that message, the connections should be OK