Ballon detachment code for http://www.bluesat.unsw.edu.au/

Requirements

• Raspberry pi
• rtl-sdr dongle
• *nix based OS (eg Debian deriv)
• deps: rtl-fm multimon python bash & the python GPIO libraries for raspi

This codes hardcodes a couple of locations. Grep for /home/pi if you want to change this for personal use.

Function and code overview

master.sh runs all of the components. Currently there are two:

• dtmf_seperation -- Seperated the satellite from the balloon. RTL-SDR, Raspi, DTMF decoding
• namuru -- Logs GPS data over serial link

dtmf_seperation

To use:

• ./compile.sh (binary for signal_detect.c not included)
• run ./manager

Each of the components chain onto each other via pipes or fifos. From start to beginning is:

• rtl-fm (not included) -- reads raw data from RTL-sdr dongle
• multimon (not included) -- processes raw RF data -> finds DTMF codes
• multimon_processing -- strips prefixing "DTMF: " text from multimon output
• signal_detect -- looks for a pattern of DTMF tones and executes setPin.py when an expected pattern is found
• setPin.py -- toggles Raspberry Pi GPIO pins

Issues

• setPin.py ignores pin owernership, so warnings will spew
• master.sh runs everything on the same terminal, so messages will overlap

Licence

Todo. Probably going to be public domain (as there is nothing here worth 'protecting'), but I will check with the team and other authors.