Control simple USB HID Relays using Node JS like this one:
npm i @josephdadams/usbrelayconst USBRelay = require("@josephdadams/usbrelay");
const relay = new USBRelay(); //gets the first connected relayTo use a specific relay, specify a HID path:
const relay = new USBRelay(path);Get connected relays:
USBRelay.Relays; //returns an array with HID data including pathsSet relay state:
relay.setState(1, true); // turns Relay 1 of the device on
relay.setState(1, false); // turns Relay 1 of the device offRelay numbers are NOT zero-based, so if you want to refer to Relay #1, use 1.
To turn all relays off:
relay.setState(0, false); // relay number 0 references all relays of the deviceTo turn a relay on, wait 1 second, and then turn off:
relay.setState(1, true);
setTimeout(function () {
relay.setState(1, false);
}, 1000);