See https://github.com/hzeller/rpi-rgb-led-matrix for how to use the LED-matrix and how to compile. If you are able to reproduce the examples there, copy the source from this repository into the main directory of rpi-rgb-led-matrix.
For wiring the LED-matrix see 32x32_matrix_wiring.png.
For building use ./my_make.sh <file>, without the file ending, e.g. ./my_make.sh mandelbrot. Run it via sudo ./mandelbrot.
For pngs, png++ needs to be installed. If I remember correctly I built it from source.
Make also sure that paths are set correctly.
Requirements: A powerbank with two usb-ports, one for the raspi, the other for the LED-matrix, similar to this. The thing on the raspi usb-port (gps receiver) is not required for the default setup.
Futurama's hypnotoad consists of three pngs with varying eyes. Bikers passing by from behind will obey.
- Raspberry pi model B
- NAVILOCK GPS NL-602U USB at usb-port closest to the raspi
- Libraries: gpsd, gpsd-client, python-gps
- First cronjob starts a bash-script which starts gpsd at boot up: gps.sh.
- Second cronjob starts a bash-script which runs a python-script readíng out the wanted gps-data and saves it to file:
- gpsspeed.sh and gpsspeed.py save in speed.txt;
- gpstime.sh and gpstime.py save in time.txt.
- Optional: Third cronjob starts the led-binary which reads out file containing the gps-data.
- It might take some time until the NAVILOCK finds the gps signal. Won't work well in a closed room.
Found no other, more elegant way to get speed or time from gps yet. Clearly, speed needs not to be shown on the LED-matrix, it can also be used for controlling the speed of the shown programs, e.g., pong runs faster for higher gps-speeds. Moreover, via gpxlogger (included in gpsd or gps-client) it is possible to record the covered distance.
sudo apt-get install gpsd gpsd-client python-gps
sudo dpkg-reconfigure gpsd
This is my configuration and might be unnecessary together with the corresponding cronjob (see below).
sudo crontab -e
@reboot cd /home/pi/<path>/rpi-rgb-led-matrix; ./gps.sh &
@reboot cd /home/pi/<path>/rpi-rgb-led-matrix; ./gpsspeed.sh &
The last command creates and updates /home/pi/<path>/rpi-rgb-led-matrix/speed.txt. Then reboot:
sudo shutdown -r now
Compile via ./my_make.sh gps.
Requirements: A rucksack. Tested with Salomon Trailrunning rucksack 12L or 20L. I recommend the 20L rucksack because of higher volume. If you plan to use the setup during rainy weather, make sure to seal the contacts via a plastic bag or similar.
The battery goes into the inside, the raspi and the gps receiver are stored in the mesh pocket at the left or right outside of the rucksack. Zipper is closed where the cables of the battery leave the rucksack.
