Firmware for RS41 for HAM use It is posible to recycle RS41-SGP sondes for amateur radio use without any electrical changes. You just have to build a new firmware (this one) and apply it via a cheap adaptor "ST-Linkv2". Modified sonde now transmits on defineable frequenca in 70cm band GPS and telemetry data in FSK RTTY format which is used by HAB projects and additionally it transmits APRS packets on a seperately defineable TX frequency.

Released under GPL v2

Use: https://www.wyzbee.com/download/Utilities/Software/CoIDE-1.7.8.exe

And: https://launchpad.net/gcc-arm-embedded/5.0/5-2016-q3-update/+download/gcc-arm-none-eabi-5_4-2016q3-20160926-win32.exe

cd into main folder

cmake .

make

All configs in config.h

• CALLSIGN RTTY callsign
• APRS_CALLSIGN APRS callsign, 6 characters. If your callsign is shorter add spaces
• APRS_SSID APRS SSID
• APRS_COMMENT APRS comment
• RTTY_TO_APRS_RATIO number of RTTY frames between each APRS frame
• RTTY_FREQUENCY RTTY frequency in MHz
• APRS_FREQUENCY APRS frequency in MHz
• RTTY_DEVIATION RTTY shift configurable in 270Hz steps
• RTTY_SPEED RTTY speed in bauds
• RTTY_7BIT Use 7 bit RTTY
• RTTY_USE_2_STOP_BITS use 2 stop bits
• TX_POWER Power 0-7, (7 means 42.95 [email protected] MHz measured on E4406A)
• TX_DELAY Delay between frames in milliseconds
• ALLOW_DISABLE_BY_BUTTON Allow disabling device using button

Have a nice day ;)

#Changelog

• 14.12.2016 - Reverse engineeded connections, initial hard work, resulting in working RTTY by SQ7FJB
• 07.01.2017 - GPS now using proprietiary UBLOX protocol, more elastic code to set working frequency by SQ5RWU
• 23.01.2017 - Test APRS code, small fixes in GPS code by SQ5RWU
• 06.06.2017 - APRS code fix, some code cleanup
• June 2017 - starting with Linux support, making configuration more flexible by DF8OE

#TODO

• Adding support for EmbiTZ IDE
• Adding support for platform independent IDE Eclipse
• More APRS config options
• Temperature and moisture sensor
• Pressure sensor
• implementing protocol for using external devices on extension header
• Configuration via extension header (serial connection) without need for reflashing firmware
• Possibly add configuration "wireless" using RFID loop present in sonde