node-red-contrib-smartnode-dfrobot
Version:
this project dependences the node-red-contrib-smartnode package for basic function. based on the smartnode package, this package provide some sersor nodes for DFRobot sensors.
88 lines (75 loc) • 3.38 kB
JavaScript
/**
* Copyright 2015, 2015 MakerCollider.
*
* 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.
**/
module.exports = function(RED) {
var checkPin = require("node-red-contrib-smartnode/extends/check_pin");
var m = require("mraa");
function pwmFan(config) {
RED.nodes.createNode(this, config);
this.pwmPin = config.pwmPin;
var node = this;
node.pwmPin = node.pwmPin>>>0;
var key = 'P'+node.pwmPin;
if (checkPin.getDigitalPinValue(key)==1){
node.status({fill: "red", shape: "dot", text: "pin repeat"});
console.log('PwmFan pwm pin ' + node.pwmPin +' repeat');
return;
}
else if (checkPin.getDigitalPinValue(key)==0){
checkPin.setDigitalPinValue(key, 1);
node.status({fill: "blue", shape: "ring", text: "pin check pass"});
}
else{
node.status({fill: "blue", shape: "ring", text: "Unknown"});
console.log('unknown pin' + node.pwmPin + ' key value' + checkPin.getDigitalPinValue(key));
return;
}
var pwm;
function setPwmto0(pin) {
var mraa =require("mraa");
var exec = require('child_process').exec;
var gpio = new mraa.Gpio(pin);
var cmd1 = "echo " + pin + " > /sys/class/gpio/unexport";
var cmd2 = "echo " + pin + " > /sys/class/gpio/export";
gpio.dir(mraa.DIR_OUT);
exec(cmd1,0);
gpio.write(0);
exec(cmd2,0);
}
this.on('input', function(msg){
var pwmValue = parseInt(msg.payload);
if (pwmValue>0)
{
if(pwmValue>255)
pwmValue = 255;
pwm = new m.Pwm(node.pwmPin);
pwm.enable(true);
pwm.write(pwmValue/255);
console.log("pwm value is: "+pwmValue/255);
}
else if (pwmValue<=0)
{
//pwm.write(0);
setPwmto0(node.pwmPin);
}
});
this.on('close', function() {
checkPin.initDigitalPin(); //init pin
//pwm.write(0);
setPwmto0(node.pwmPin);
});
}
RED.nodes.registerType("DF-Fan", pwmFan);
}