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1 Overview

In this lesson, we’ll learn how remote to control a relay switch to turn on/off a led.

2 Hardware Preparation

UNO R3 board 1
Ethernet Shield W5100 1
USB cable 1
1K resistor 1
Relay 1
Jumper wires several
Breadboard 1

3 Hardware connection

Connect the relay with UNO as following diagram:

4 Add new Device

Log in Cayenne IOT platform, Add new…->Device/Widget


Click Relay Switch, and set the datasheet as followed:

Please note: if V13 was used by other widgets, you can select other pins, then set the virtual pin in sketch to the pin number you have selected.

In your dashboard, click”Step 1:Sketch File”, the sample sketch will be displayed, copy and paste the sketch into Arduino IDE

Choose the Board type Arduino Uno and correct Port, remember to use your authentication token. upload the sketch to Uno board, in your Cayenne dashboard click”Step 2 :Add Actuators” then you should see the Relay Switch was added on your dashboard:

Now you can remote control the replay switch to turn on/off a LED by clicking the button on your smart phone or web browser.