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@ -35,13 +35,15 @@ Great pcb reverse enginering work was made by [joyel24](https://github.com/joyel
There are 2 variants of GPS modules, both of them are supported.
## New GPS (NMEA)
In newer M20 sondes u-blox MAX-M10M that uses NMEA protocol.
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/gps_new.jpg?raw=true)
## Old GPS (XM1110)
In older M20 sondes XM1110 GPS module was used. It transmits data over UART but with custom firmware that transmits only binary protocol data.
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/gps_old.jpg?raw=true)
Data format:
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/GPS.jpg?raw=true)
![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/GPS.png?raw=true)
# Barometer and temp sensor
LPS22HB sensor is used with SPI interface. File lps22hb.c and lps22hb.c are a library for this sensor.