node-native-gpio is a sysfs General Purpose Input Output wrapper for node.js. It gives you the ability to control GPIO devices in a simple object orientated manner.
Install node-native-gpio with npm(1):
$ npm install node-native-gpio
var gpio = require('native-gpio'); var gpio22 = new gpio.GPIO(22); gpio22.direction(gpio.OUT) .value(gpio.HIGH) .value(gpio.LOW) .value(gpio.HIGH);
GPIO function prototype is a C++ add-on which abstracts a GPIO device as
instancable object. There are some class constants defined which should be used
for setting values (see below).
Direction constant used to determinate that our GPIO device listens for
incoming signals. While a device is set to
IN we can only read and not write
Direction constant used to determinate that our GPIO device writes outgoing
signals. While a device is set to
OUT we can read and set the current value.
Value constant for off state of a GPIO device.
Value constant for on state of a GPIO device.
var gpio36 = new GPIO(36);
if (gpio36.direction() == GPIO.OUT) gpio36.direction(GPIO.IN);
Returns the current GPIO direction mode if no arguments supplied else it will check if the first argument is a valid constant and then will set this as GPIO direction.
while (gpio36.value() != GPIO.HIGH) // wait until GPIO value changes to HIGH // use GPIO as output device gpio36.direction(GPIO.OUT).value(GPIO.LOW);
Returns the current GPIO value if no arguments supplied else it will check if the first argument is a valid constant and then will use this as GPIO value.
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