Elixir code for a cat feeder that receives interrupts from a proximity sensor and triggers a stepper motor to turn an augur to deliver a small amount of food. It then waits 20 minutes before it can be activated again.
See related blog posts on http://wsmoak.net
The proximity sensor is a VCNL4010 from Adafruit https://www.adafruit.com/product/466 https://cdn-shop.adafruit.com/product-files/466/vcnl4010.pdf
The stepper motor is controlled by a PCA9685 (among other things) on the Adafruit Stepper Motor HAT https://www.adafruit.com/products/2348 http://www.adafruit.com/datasheets/PCA9685.pdf
Initially:
- Install dependencies with
mix deps.get - Create firmware with
mix firmware - Burn to an SD card with
mix firmware.burn
Subsequently:
- Create firmware with
mix firmware - Burn to an SD card with
mix firmware.burn --task upgradeto avoid overwriting the appdata partition
To set the time:
Connect a monitor and keyboard to the RPi. After it boots, hit enter to get an iex prompt if one is not visible. Enter System.cmd("date",["MMDDHHMMYYYY"]) for the current time in UTC.