It works with HELTEC and TTGO boards with sx1276 RF chip for 868/915MHz
The quickest board to run is the T-Beam from TTGO as it includes GPS, RF chip, battery circuit and holder, optionally as well a small OLED display. Yout to solder BMP280 or BME280 pressure/temperature/humidity sensor.
To see the console output and thus to check if the ESP32 is alive
```
minicom
```
For minicom setup use 115200bps /dev/ttyUSB0 serial port and turn hardware and software handshake OFF. It is important, otherwise if you type something it won't be sent to the ESP32.
Press *Ctrl-C* to list the internal state and parameters. To change parameters, use $POGNS like this:
Wiring is fairly flexible, as the ESP32 can easily redefine the I/O signals. You need to avoid pins which are already used: the list normally comes with every ESP32 module. You can choose the pins after their placement on the board, for example such, that all wires are soldered on one side. Wiring for various modules has been chosen but if needed can easily be changed.
### HELTEC v1 and TTGO boards without GPS
For the original HELTEC board and similar TTGO boards without the GPS you need to wire the UART GPS follow the pins defined in the hal.cpp