node-red/nodes/hardware/35-arduino.js

/**
 * Copyright 2013 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 **/

var RED = require("../../red/red");
var util = require("util");
var firmata = require("firmata");
var arduinoReady = false;
var thisboard = null;

// The Board Definition - this opens (and closes) the connection
function ArduinoNode(n) {
	RED.nodes.createNode(this,n);
	this.device = n.device;
	this.repeat = n.repeat||25;
	util.log("[firmata] Opening "+this.device);
	var node = this;

	node.toun = setInterval(function() {
		if (!arduinoReady) {
			if (thisboard == null) {
				node.board = new firmata.Board(node.device, function(err) {
					if (err) {
						console.log("[firmata] error: ",err);
						return;
					}
					arduinoReady = true;
					thisboard = node.board;
					clearInterval(node.toun);
					util.log('[firmata] Arduino connected');
				});
			}
			else {
				node.board = thisboard;
				node.board.removeAllListeners();
				arduinoReady = true;
				clearInterval(node.toun);
				node.toun = false;
				util.log("[firmata] Arduino already connected");
			}
		} else { util.log("[firmata] Waiting for Firmata"); }
	}, 10000); // wait for firmata to connect to arduino

	this.on('close', function() {
		//this.board.sp.close(function() { console.log("[firmata] Serial port closed"); arduinoReady = false; });
		arduinoReady = false;
		if (node.toun) {
			clearInterval(node.toun);
			util.log("[firmata] arduino wait loop stopped");
		}
		util.log("[firmata] Stopped");
	});
}
RED.nodes.registerType("arduino-board",ArduinoNode);


// The Input Node
function DuinoNodeIn(n) {
	RED.nodes.createNode(this,n);
	this.buttonState = -1;
	this.pin = n.pin;
	this.state = n.state;
	this.arduino = n.arduino;
	this.serverConfig = RED.nodes.getNode(this.arduino);
	if (typeof this.serverConfig === "object") {
	this.board = this.serverConfig.board;
		this.repeat = this.serverConfig.repeat;
		var node = this;

		node.toui = setInterval(function() {
			if (thisboard != null) {
				node.board = thisboard;
				clearInterval(node.toui);
				node.toui = false;
				//console.log(node.state,node.pin,node.board.MODES[node.state]);
				node.board.pinMode(node.pin, node.board.MODES[node.state]);
				node.board.setSamplingInterval(node.repeat);
				var oldrdg = "";
				if (node.state == "ANALOG") {
					node.board.analogRead(node.pin, function(data) {
						var msg = {payload:data, topic:"A"+node.pin};
						if (data != oldrdg) {
							node.send(msg);
							oldrdg = data;
						}
					});
				}
				else {
					node.board.digitalRead(node.pin, function(data) {
						var msg = {payload:data, topic:node.pin};
						node.send(msg);
					});
				}
			}
			else { node.log("Waiting for Arduino"); }
		}, 5000); // loop to wait for firmata to connect to arduino

		this.on('close', function() {
			if (node.toui) {
				clearInterval(node.toui);
				util.log("[firmata] input wait loop stopped");
			}
		});
	}
	else {
		util.log("[firmata] Serial Port not Configured");
	}
}
RED.nodes.registerType("arduino in",DuinoNodeIn);


// The Output Node
function DuinoNodeOut(n) {
	RED.nodes.createNode(this,n);
	this.buttonState = -1;
	this.pin = n.pin;
	this.state = n.state;
	this.arduino = n.arduino;
	this.serverConfig = RED.nodes.getNode(this.arduino);
	if (typeof this.serverConfig === "object") {
		this.board = this.serverConfig.board;
		var node = this;

		this.on("input", function(msg) {
			//console.log(msg);
			if (thisboard != null) {
				if (node.state == "OUTPUT") {
					if ((msg.payload == true)||(msg.payload == 1)||(msg.payload.toString().toLowerCase() == "on")) {
						node.board.digitalWrite(node.pin, node.board.HIGH);
					}
					if ((msg.payload == false)||(msg.payload == 0)||(msg.payload.toString().toLowerCase() == "off")) {
						node.board.digitalWrite(node.pin, node.board.LOW);
					}
				}
				if (node.state == "PWM") {
					msg.payload = msg.payload * 1;
					if ((msg.payload >= 0) && (msg.payload <= 255)) {
						//console.log(msg.payload, node.pin);
						node.board.servoWrite(node.pin, msg.payload);
					}
				}
				if (node.state == "SERVO") {
					msg.payload = msg.payload * 1;
					if ((msg.payload >= 0) && (msg.payload <= 180)) {
						//console.log(msg.payload, node.pin);
						node.board.servoWrite(node.pin, msg.payload);
					}
				}
			}
			//else { console.log("Arduino not ready"); }
		});

		node.touo = setInterval(function() {
			if (thisboard != null) {
				clearInterval(node.touo);
				node.touo = false;
				node.board = thisboard;
				node.board.pinMode(node.pin, node.board.MODES[node.state]);
			}
			else { util.log("[firmata] waiting for arduino to connect"); }
		}, 5000); // loop to wait for firmata to connect to arduino

		this.on('close', function() {
			if (node.touo) {
				clearInterval(node.touo);
				util.log("[firmata] output wait loop stopped");
			}
		});
	}
	else {
		util.log("[firmata] Serial Port not Configured");
	}
}
RED.nodes.registerType("arduino out",DuinoNodeOut);