#Relay Driver for the relay-mono Tessel relay module. The hardware documentation for this module can be found here.

If you run into any issues you can ask for support on the Relay Module Forums.

###Installation

npm install relay-mono

###Example

/*********************************************
This relay module demo toggles both relay
channels every two seconds, logging the new
values to the console upon latching.
*********************************************/

var tessel = require('tessel');
var relaylib = require('../'); 

var relay = relaylib.use(tessel.port['A']);  

// Wait for the module to connect
relay.on('ready', function relayReady () {
  console.log('Ready! Toggling relays...');
  setInterval(function toggle() {
    // Toggle relay channel 1
    relay.toggle(1, function toggleOneResult(err) {
      if (err) console.log("Err toggling 1", err);
    });
    // Toggle relay channel 2
    relay.toggle(2, function toggleTwoResult(err) {
      if (err) console.log("Err toggling 2", err);
    });
  }, 2000); // Every 2 seconds (2000ms)
});

// When a relay channel is set, it emits the 'latch' event
relay.on('latch', function(channel, value) {
  console.log('latch on relay channel ' + channel + ' switched to', value);
});

###Methods # relay.getState( relayChannel, callback(err, state) )
Gets the state of the specified relay channel: "true" for on and "false" for off.

# relay.toggle( relayChannel, callback(err) )
Switches the state of the specified relay channel: on if it's off; off if it's on.

# relay.turnOff( relayChannel, callback(err) )
Switches off the specified relay channel.

# relay.turnOn( relayChannel, callback(err) )
Switches on the specified relay channel.

###Events # relay.on( 'error', callback(err) )
Emitted upon error.

# relay.on( 'latch', callback(channel, state))
Emitted when the latch state (boolean on or off ) is changed for a channel.

# relay.on( 'ready', callback() )
Emitted upon first successful communication between the Tessel and the module.

###License MIT or Apache 2.0, at your option