This is a node.js add-on which wraps around Mike McCauley's
bcm2835 library to allow mmap
access via /dev/mem to the GPIO pins.
If you want something more featureful then for now you should check out James
Barwell's rpio-gpio.js. The
reason for me writing this module instead of using James' is that his uses the
/sys interface which is too slow for my requirements.
Easily install the latest via npm:
$ npm install rpiovar rpio = require('rpio')
// Enable a pin and mark as read-only
rpio.setInput(11)
// Enable a pin and mark as read-write
rpio.setOutput(12)
// Read value of pin
console.log('pin 11 is set to ' + rpio.read(11))
// Set pin high (i.e. write '1' to it)
rpio.write(12, rpio.HIGH)/*
* Simple demo to flash pin 11 at 100Hz (assuming it's routed to an LED).
*/
var rpio = require('rpio')
// Set the pin for write mode
rpio.setOutput(11)
// Set the pin high every 10ms
setInterval(function() {
rpio.write(11, rpio.HIGH)
}, 10)
// Set the pin low every 10ms, offset by 5ms.
setTimeout(function() {
setInterval(function() {
rpio.write(11, rpio.LOW)
}, 10)
}, 5)## Authors and licenses
Mike McCauley wrote src/bcm2835.{cc,h} which are under the GPL.
I wrote the rest, which is under the ISC license unless otherwise specified.