Turn on an LED with Watson Conversation

1.)  You will need to have node already installed on your Pi. You may find NPM's rpio-gpio site helpful for syntax.

2.)  Run the command npm install rpi-gpio in terminal.

3.) We started with the conversation.js file from Watson's TJBot example, and added the following lines before we instantiated our bot.

var gpio = require('rpi-gpio');
var pin = 7;
gpio.setup(pin, gpio.DIR_OUT);

The first parameter for setup() is the channel.  Make sure to reference the RPi pin number and not the GPIO.  The second parameter is the direction, DIR_OUT writes to pin #7.  You can also change the name of your bot to something different.  We picked "Bob" as it was less likely to be confused with other words.

// instantiate our TJBot!
var tj = new TJBot(hardware, tjConfig, credentials);
tj.configuration.robot.name ="Bob";

4.) After the utterances part of the code add the following code for speech recognition.

var containsOn = msg.indexOf("on") >= 0;
var containsOff = msg.indexOf("off") >= 0;
var containsLight = msg.indexOf("light") >= 0;

//turns on light
if (containsLight && containsOn ) {
  console.log("Turn on Light")
  gpio.write(pin,true);
};

// turns off light

if (containsLight && containsOff ) { 
  console.log("Turn off Light")
  gpio.write(pin,false);
};

5.) Setup for the pins.

6.) The complete node js code.