myojs-busyarm

A plugin for Myo.js that detects when your arm is busy.

See it in action here (requires a myo!)

busyarm.myo.js will emit a arm_busy event when the arm becomes busy and a arm_rest event when the arm is at rest. The variable myo.isArmBusy is a boolean that tracks what state the arm is in.

The library uses a Exponential moving average to smooth the gyroscope data. If the EMA goes above a certain threshold, the arm is considered busy.

Myo.on('arm_busy', function(){
	console.log('You are quite the hand talker');
});
Myo.on('fist', function(){
	if(!this.isArmBusy){
		this.trigger('calm_fist');
	}
})

Check out the demo for an example of how to use it.

configuration

Myo.plugins.busyarm = {
	threshold : 80,     //The threshold the EMA has to pass to be considered busy
	ema_alpha : 0.05,   //The coefficient for smoothing the EMA of the gyro data
};

You can use the demo to get an idea of a good threshold for you while doing different actions.