Update README.md

README.md

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 # m20-custom-firmware
-The goal of the project is to reverse engineer the Meteomodem M20 radiosonde and build custom firmware for it for use in ham radio baloons. Work is currently underway to make individual modules work such as GPS, radio etc. Once this is achieved, the full firmware will be built. In this state, the code only tests individual elements.
+The goal of the project is to reverse engineer the Meteomodem M20 radiosonde and build custom firmware for it for use in ham radio baloons. Work is currently underway to make individual modules work such as GPS, radio etc. Once this is achieved, the full firmware will be built. In this state, the code only testing individual elements.
 # What works
 - GPS: :heavy_check_mark:
 - Radio: only CW
@@ -14,8 +14,16 @@ The goal of the project is to reverse engineer the Meteomodem M20 radiosonde and
 ![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/bottom.jpg?raw=true)
 ![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/sticker.jpg?raw=true)
 
+# Schematics
+Great pcb reverse enginering work was made by [joyel24](https://github.com/joyel24/M20-radiosonde-firmware-alt), [PDF link](https://www.egimoto.com/dwld/17528ed1858138.pdf)
+
+# Code
+Code is writen in C using stm32CubeIDE.
+
 # GPS
 M20 uses xm1110 gps module that transmits data over UART but with custom firmware that transmits only binary protocol data.
 Data format:
 ![alt text](https://github.com/sq2ips/m20-custom-firmware/blob/main/img/GPS.png?raw=true)
 
+# Radio
+TODO