いいかんじ

iikanji.js

var GPIO = require('./gpio.js');

var watcher = GPIO.watcher(50);

watcher.watch('P9_23');

watcher.on(GPIO.high('P9_23'), function(){
	console.log('High!!!');
});

watcher.on(GPIO.low('P9_23'), function(){
	console.log('Low!!!!');
});