'use strict'; const i2c = require('../'); const i2c1 = i2c.openSync(42); const address = 0x50; i2c1.deviceId(address, (err, id) => { if (err) { console.log('error', err); } else { console.log('id for address', '0x' + address.toString(16), id); } i2c1.closeSync(); });