This is my code for a darkroom timer using:
- RaspberryPi
- IoT Relay (power switch)
- 8x8 x4 LED Matrix
- USB Numpad
The SPI and IoT device should be connected before the software is installed
The IOT device should be connected to GPIO 18 (aka PI Pin number 12)
- Enable SPI launch
sudo raspi-config
and into5 Interface Options
setP4 SPI
toYes
- Launch
sudo raspi-config
and into3 Boot Options
thenB1 Desktop / CLI
and setB2 Console Autologin
- Add user to proper groups
sudo usermod -a -G spi,gpio pi
- Install luma pre-reqs
sudo apt update && sudo apt install -y build-essential python3-dev python3-pip python3-venv libfreetype6-dev libjpeg-dev libopenjp2-7 libtiff5 git
- Checkout darkroom
cd ~ && git clone https://github.com/cdgriffith/darkroom && cd darkroom
- Create a virtual env
python3 -m venv venv
- Activate env
source venv/bin/activate
- Update pip
python -m pip install --upgrade --ignore-installed pip setuptools
- Install requirements
pip install -r requirements.txt
- Test the program
python -m darkroom
- Add it to bashrc
echo "PYTHONPATH=/home/pi/darkroom /home/pi/darkroom/venv/bin/python -m darkroom" > ~/.bashrc
Once added to the bashrc file, it will automatically launch when the user logs in. This will "take over" the console, even on SSH connections, so remember if you need to switch back to console to hit E or Ctrl+C first.
* Start key capture (to input time via number keys, hit "*" again to accept)
+ Add a tenth of a second
- Remove a tenth of a second
/ "Focus" - Turn the enlarger on
ENTER "Print" - Enlarger on, timer counts down to zero then turns the enlarger back off
e Pressing E or Ctrl+C Will exit the program
It is possible to customize a few things with environment variables
- X_OFFSET (default 0)
- Y_OFFSET (default -2)
- BLOCK_DIR (default -90)
- ENLARGER_PIN = (default 18)
- STARTUP_MESSAGE = (default 'LOVE U')
- FONT_FILE = (default "darkroom/fonts/scoreboard.ttf")
This is MIT Licensed, view the LICENSE file for details.
This is using the Free for personal use Scoreboard font available at https://www.ffonts.net/Score-Board.font