clojure-gpiod

Clojure adapter for libgpiod, a library for controlling GPIO on linux using the GPIO character device.

Usage

Currently only basic adapters for the gpiod command line tools are implemented. Make sure you have libgpiod installed on your system, on rasbpian the library including the command line tools is installed by default.

A few basic examples are available as babashka tasks. Run bb tasks to list them out.

The adapters are available in the com.msladecek.gpio.libgpiod-cli-adapter namespace.

;; Example script that copies signal from pin 3 to pin 17
;; 1. Connect an LED between pin 17 and ground.
;; 2. Connect a button between pin 3 and ground.
;; 3. Run the script, repeatedly press the button.
;; The LED should light up whenever the button is pressed

(require '[com.msladecek.gpio.libgpiod-cli-adapter :as gpio])

(defn copy-signal [event]
  (gpio/set-lines-once {"GPIO17" (= :falling (:event-type event))}))

(gpio/monitor-lines copy-signal ["GPIO3"])

The adapters are meant to be compatible with babashka and I tested them only as part of a babashka script running on NixOS on a raspberry pi 400. However, there is no reason why they shouldn't be usable also from regular JVM clojure. If you run into any issues with them, feel free to submit a bug report.