Awesome
Connect Ra-01 module base on LoRaTM SX127x chip to ESP8266/ESP32 under MicroPython
Notes
- This is experimental example, not software product ready for use
- This this free and open source software
- Author: Alex Zorg azorg(at)mail.ru
- Licenced by GPLv3
- Some sources based on:
- https://github.com/Wei1234c/SX127x_driver_for_MicroPython_on_ESP8266
- https://wei1234c.blogspot.tw/2017/08/sx127x-lora-transceiver-driver-for.html
Download Micropython firmware
Go to:
-
"Getting started with MicroPython on the ESP8266" http://docs.micropython.org/en/latest/esp8266/esp8266/tutorial/intro.html
-
"Firmware for ESP8266/ESP32 boards" http://micropython.org/download
Install esptool.py - ESP8266 & ESP32 ROM Bootloader Utility
$ sudo apt-get install python-pip
$ sudo pip install esptool
OR
$ sudo apt-get install python-serial
$ sudo apt-get install python-ecdsa ecdsautils
$ sudo apt-get install python-slowaes
$ git clone https://github.com/espressif/esptool.git
$ cd esptool
$ sudo python setup.py install
Flash firmware on ESP8266/ESP32 board
ESP8266:
$ esptool.py --port /dev/ttyUSB0 erase_flash
$ esptool.py --port /dev/ttyUSB0 --baud 115200 write_flash --flash_size=detect 0 firmware.bin
ESP32:
$ esptool.py --chip esp32 --port /dev/ttyUSB0 erase_flash
$ esptool.py --chip esp32 --port /dev/ttyUSB0 write_flash -z 0x1000 firmware.bin
Connect LoRa module to ESP8266/ESP32
| GPIO | DOIT ESP32 | NodeMCU v3 | Signal | SX1278 (color) |
|---|---|---|---|---|
| 0 | - | D3 | ||
| 2 | D2 | D4 | Blue LED | |
| 4 | D4 | D2 | IRQ | DIO0 (yellow) |
| 5 | D5 | D1 | HARD RESET | RESET (magenta) |
| 9 | - | S2? | ||
| 10 | - | S3/SK? | ||
| 12 | D12 | D6 | MISO | MISO (blue) |
| 13 | D13 | D7 | MOSI | MOSI (green) |
| 14 | D14 | D5 | SCK | SCK (white) |
| 15 | D15 | D8 | CS | NSS (grey) |
| 16 | RX2 | D0 | DATA* | DIO2* (brown) |
| - | - | - | DCLK** | DIO1** (orange) |
| 3V3 | 3V | 3.3V | 3.3V (red) | |
| GND | G | GND | GND (black) |
Note (*): DIO2(DATA) is optional and may used in continuous FSK/OOK mode
Note (**): DIO1(DCLK) unused
Build mpy-cross
$ sudo apt-get install build-essential libreadline-dev libffi-dev git
$ git clone --recurse-submodules https://github.com/micropython/micropython.git
$ cd ./micropython/ports/unix
$ make axtls
$ make
$ sudo cp ./micropython /usr/local/bin
$ cd ../../mpy-cross
$ make
$ sudo cp ./mpy-cross /usr/local/bin
Install ampy - Utility to interact with a MicroPython board over a serial connection
$ sudo pip install adafruit-ampy
OR
$ sudo apt-get install python-click
$ git clone https://github.com/adafruit/ampy.git
$ cd ampy
$ sudo python setup.py install
Read and edit "main.py" and "sx127x.py", compile "sx127x.py"
$ vim sx127x.py
$ vim main.py
$ mpy-cross -O3 sx127x.py
Load python examples to ESP module
$ ampy --port /dev/ttyUSB0 put sx127x.mpy
$ ampy --port /dev/ttyUSB0 put main.py
Run terminal (minicom, picocom or screen)
$ minicom -D /dev/ttyUSB0 -b 115200
$ picocom /dev/ttyUSB0 -b 115200
$ screen /dev/ttyUSB0 115200