d1miniradiohead
Tests of two radio modules. I two sets of Wemos d1 min - radio to be able to test communication between them.
- Radio modules
- Adafruit RFM95W LoRa Radio Transceiver - https://www.adafruit.com/product/3072
- nrf24l01+ - http://www.ebay.com/itm/2pcs-NRF24L01-2-4GHz-Antenna-Wireless-Transceiver-Module-Microcontrol-/251044600998
- Controlled by wemos d1 mini - https://www.wemos.cc/product/d1-mini.html
- Software driver: Radiohead - http://www.airspayce.com/mikem/arduino/RadioHead/index.html
- software development environment: PlatformIO in Atom editor
2.4GHz radio nRF24l01+
Wiring
| Wemos d1 mini | nRF24l01+ |
|---|---|
| 3v3 | VCC |
| G | GND |
| D8 | CSN |
| D7 | MOSI |
| D6 | MISO |
| D5 | CLK |
| D2 | CE |
| -- | IRQ |
Software
I started with
- http://www.airspayce.com/mikem/arduino/RadioHead/nrf24_reliable_datagram_client_8pde-example.html
- http://www.airspayce.com/mikem/arduino/RadioHead/nrf24_reliable_datagram_server_8pde-example.html.
In both programs I specified my pin assigments for EN and CSN by replacing the row
RH_NRF24 driver;
with
RH_NRF24 driver(D2, D8);
resulting in the project folders nrf24rx and nrf24tx.
- Install PlatformIO
- clone this repo
- open nrf24tx and nrf24rx in PlatformIO
- Upload to each d1 mini - radio set
- Connect the nrf24rx set to your PC, open a serial monitor and reset it. It should not say init failed.
- Connect the nrf24rx set to a power supply
- Connect the nrf24tx to your PC, and open a serial monitor and reset to see that it initilizes correctly
- Now you should see something like this:
➜ nrf24rx git:(master) pio -f -c atom serialports monitor --port /dev/cu.wchusbserial1410
--- Miniterm on /dev/cu.wchusbserial1410 115200,8,N,1 ---
--- Quit: Ctrl+C | Menu: Ctrl+T | Help: Ctrl+T followed by Ctrl+H ---
Sending to nrf24_reliable_datagram_server
got reply from : 0x2: And hello back to you
Sending to nrf24_reliable_datagram_server
got reply from : 0x2: And hello back to you
...
868MHz Lora radio RFM95W
Wiring
| Wemos d1 mini | RFM95W |
|---|---|
| 3v3 | Vin |
| G | GND |
| D8 | CS |
| D7 | MOSI |
| D6 | MISO |
| D5 | SCK |
| D2 | G0 (IRQ) |
| -- | EN not connected makes it enabled |
Software
I started with
- http://www.airspayce.com/mikem/arduino/RadioHead/rf95_reliable_datagram_client_8pde-example.html
- http://www.airspayce.com/mikem/arduino/RadioHead/rf95_reliable_datagram_server_8pde-example.html.
In this case I changed two lines in both programs:
RH_RF95 driver;
with
RH_RF95 driver(D8, D2);
and as I live in Sweden I added the following line to set the allowed frequency:
driver.setFrequency(868.0);
resulting in the project folders lorarx and loratx.