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

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/**
* Copyright 2013,2014 IBM Corp.
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*
* 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.
**/
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module.exports = function(RED) {
"use strict";
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var util = require("util");
var ArduinoFirmata = require('arduino-firmata');
var fs = require('fs');
var plat = require('os').platform();
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// The Board Definition - this opens (and closes) the connection
function ArduinoNode(n) {
RED.nodes.createNode(this,n);
this.device = n.device || null;
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this.repeat = n.repeat||25;
//node.log("opening connection "+this.device);
var node = this;
var pre = "\\\\.\\";
if (!plat.match(/^win/)) { pre = ""; }
node.board = new ArduinoFirmata();
if (!fs.existsSync(pre+node.device)) {
node.warn("Device "+node.device+" not found");
}
else {
node.board.connect(node.device);
node.board.on('connect', function(){
node.log("version "+node.board.boardVersion);
});
}
node.on('close', function() {
if (node.board) {
try {
node.board.close(function() {
node.log("port closed");
});
} catch(e) { }
}
});
}
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RED.nodes.registerType("arduino-board",ArduinoNode);
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// 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;
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var node = this;
node.status({fill:"red",shape:"ring",text:"connecting"});
node.board.on('connect', function() {
node.status({fill:"green",shape:"dot",text:"connected"});
//console.log("i",node.state,node.pin);
if (node.state == "ANALOG") {
node.board.on('analogChange', function(e) {
if (e.pin == node.pin) {
var msg = {payload:e.value, topic:"A"+e.pin};
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node.send(msg);
}
});
}
else {
node.board.pinMode(node.pin, ArduinoFirmata.INPUT);
node.board.on('digitalChange', function(e) {
if (e.pin == node.pin) {
var msg = {payload:e.value, topic:e.pin};
node.send(msg);
}
});
}
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});
}
else {
util.log("[Firmata-arduino] port not configured");
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}
}
RED.nodes.registerType("arduino in",DuinoNodeIn);
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// 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;
node.status({fill:"red",shape:"ring",text:"connecting"});
node.board.on('connect', function() {
node.status({fill:"green",shape:"dot",text:"connected"});
//console.log("o",node.state,node.pin);
node.board.pinMode(node.pin, node.state);
node.on("input", function(msg) {
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if (node.state == "OUTPUT") {
if ((msg.payload == true)||(msg.payload == 1)||(msg.payload.toString().toLowerCase() == "on")) {
node.board.digitalWrite(node.pin, true);
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}
if ((msg.payload == false)||(msg.payload == 0)||(msg.payload.toString().toLowerCase() == "off")) {
node.board.digitalWrite(node.pin, false);
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}
}
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);
}
}
});
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});
}
else {
util.log("[Firmata-arduino] port not configured");
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}
}
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RED.nodes.registerType("arduino out",DuinoNodeOut);
RED.httpAdmin.get("/arduinoports",function(req,res) {
ArduinoFirmata.list(function (err, ports) {
//console.log(JSON.stringify(ports));
res.writeHead(200, {'Content-Type': 'text/plain'});
res.write(JSON.stringify(ports));
res.end();
});
});
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}