CubeSatSim/README.md

CubeSatSim

The CubeSat Simulator https://github.com/alanbjohnston/CubeSatSim/wiki is a low cost satellite emulator that run on solar panels and batteries, transmits UHF radio telemetry, has a 3D printed frame, and can be extended by additional sensors and modules. This project is sponsored by the not-for-profit Radio Amateur Satellite Corporation, AMSAT®.

Requires:

• wiringpi
• git
• libasound2-dev
• pi-power-button
• Direwolf
• rpitx

See the Wiki Software Install page for more details: https://github.com/alanbjohnston/CubeSatSim/wiki/Software-Install. To build and run the software on a Raspberry Pi 3B, 3B+, or Pi Zero W:

sudo apt-get install wiringpi, git, libasound2-dev

git clone http://github.com/alanbjohnston/CubeSatSim.git

git checkout aprs-rpitx-v4

cd CubeSatSim

Edit the afsk/main.c file to set your amateur radio callsign, then

make rebuild

git clone https://www.github.com/wb2osz/direwolf

cd direwolf

make -j

(takes a while)

sudo make install

make install-rpi

cd ~/CubeSatSim

git clone https://github.com/F5OEO/rpitx.git

cd rpitx

./install.sh

(Takes a while). It will prompt you if you want to modify /boot/config.txt file. Type a y and the script will complete.

cd ~/CubeSatSim

git clone https://github.com/Howchoo/pi-power-button.git

cd pi-power-button

cp ../python/listen-for-shutdown.py listen-for-shutdown.py

./pi-power-button/script/install

Now reboot for all the changes to take effect:

sudo reboot now

After rebooting, to hear AFSK telemetry (X.25 data), tune your radio or SDR to 434.9 MHz FM, and you should receive telemetry from the CubeSat Sim:

CubeSatSim/radioafsk

This code uses the Brandenburg Tech Digital Transceiver, based on DigitalTxRxRP https://brandenburgtech.wordpress.com/ If you don't have the SPI Interface enabled and the board plugged in, you will get an error.

This repository contains:

• afsk - Code that sends telemetry in 1k2 AFSK X.25 format
• arduino - Sample Arduino sketches to show how payload sensors can be interfaced to CubeSat Simulator
• ax5043 - Source for a library of functions to communicate with the AX5043 and configure the AX5043.
• cw - Code that sends telemetry in CW (Morse code) using AO-7 format
• libs - External libraries
• python - Python code for reading I2C sensors for current and temperature
• spreadsheet - Spreadsheets for decoding and analyzing the Simulator telemetry (see https://github.com/alanbjohnston/CubeSatSim/wiki/Decoding-Telemetry for details)
• wav - Wave audio files of CW or AFSK telemetry for listening or transmitting usng a CubeSat Simulator Lite
• demo.sh - a shell script to run the Simulator on boot using systemd (see https://github.com/alanbjohnston/CubeSatSim/wiki/Software-Install#autoboot-configuration for how to configure the Pi)

See the Wiki for more details https://github.com/alanbjohnston/CubeSatSim/wiki