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Control 5v dcttech.com relay using node.js
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| var HID = require('node-hid'); | |
| var _ = require("lodash") | |
| var device | |
| device = setup() | |
| setInterval(function() { | |
| setState(!getState()) | |
| console.log("Relay enabled? " + getState()) | |
| }, 1000) | |
| function setup() { | |
| relay = _.find(HID.devices(), function(item) { | |
| return item.product.indexOf("USBRelay") != -1 | |
| }) | |
| if (relay) { | |
| console.log("Found relay!") | |
| return new HID.HID(relay.path); | |
| } else { | |
| console.log("No relay found!") | |
| return false | |
| } | |
| } | |
| function getState() { | |
| // Byte 8 = State. 3 = on, 0 = off | |
| return device.getFeatureReport(0x00, 0x10)[8] !== 0 ? true : false | |
| } | |
| function setState(state) { | |
| // Byte 0 = Report ID | |
| // Byte 1 = State | |
| // Byte 2 = Relay | |
| // Bytes 3-8 = Padding | |
| var ON = [0x00, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00] | |
| var OFF = [0x00, 0xFC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00] | |
| device.sendFeatureReport(state ? ON : OFF) | |
| } |
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