---
title: "Control an LED over the Internet via Arduino with Teleduino"
url: "https://maker.wiznet.io/WIZnet/projects/control-an-led-over-the-internet-via-arduino-with-teleduino/"
markdown_url: "https://maker.wiznet.io/WIZnet/projects/control-an-led-over-the-internet-via-arduino-with-teleduino/md"
type: "UCC: User Created Content"
author: "nathanknz"
author_url: "https://www.instructables.com/Control-an-LED-over-the-Internet-via-Arduino-with-/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "nathanknz"
original_url: "https://www.instructables.com/Control-an-LED-over-the-Internet-via-Arduino-with-/"
published: "2023-01-31"
language: "en"
hardware: ["Arduino Ethernet Shield", "Arduino UNO"]
likes: 2
views: 456
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Control an LED over the Internet via Arduino with Teleduino

> This tutorial will guide you through the process of attaching an LED to your Arduino and provide some example Teleduino API calls.

Original author: nathanknz (source: https://www.instructables.com/Control-an-LED-over-the-Internet-via-Arduino-with-/)

## Components

- **Arduino Ethernet Shield** x 1 ([docs](https://docs.arduino.cc/retired/shields/arduino-ethernet-shield-without-poe-module))
- **Arduino UNO** x 1 ([docs](https://www.farnell.com/datasheets/1682209.pdf))

## Documents and links

- [API reference manual](http://www.teleduino.org/rtfm/api/328.php)

## Article

This tutorial will guide you through the process of attaching an LED to your Arduino, and provide some example Teleduino API calls to:

- Define the pin mode of a pin

- Turn on the LED

- Turn off the LED

- Set the brightness of the LED (using one of the PWM supported pins on the Arduino)

**Step 1: Prepare an LED**

In this step we put together an LED that we can easily connect to our Arduino.

**Parts needed:**

- An LED (we decided to use a 10mm white LED because they look neat)

- A 1K Resistor (or similar)

- Some hookup wire (we chose to use some single strand ethernet cable because it's cheap, and connects well to the Arduino pin sockets)

- Some heat shrink (optional, but makes it look nice and tidy)

**Steps:**

- Take the LED and shorten the lead on the flat-edge side (the shortest lead).

- Shorten one of the leads on the resistor.

- Solder the short lead of the resistor to the short lead of the LED.

- Shorten the other lead on the resistor so that it's the same length as the remainder lead on the LED.

- Solder the hookup wire to the two leads, and apply heatshrink. Take note of which lead is soldered to the resistor (we chose the white wire for this).

- Strip the other end of the hookup wires and connect to the Arduino. The white wire (the wire connected to the resistor) connects to a GND pin, and the other (our green wire) connects to a digital pin (we chose pin 3 because it also supports PWM).

**Step 2: Control LED Via the Teleduino API**

Here are some example API calls that you can use to control your LED. You need to replace {key} with the unique API key you obtained when you completed the instructable Arduino Control via a Web Service with Teleduino. Just chuck the URLs into your browser's address bar and you should see some magic happen on that LED.

Define the pin mode of digital pin 3 (Must be done once per boot prior to setting digital outputs. 'pin=3' mean pin 3, 'mode=1' means OUTPUT):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=definePinMode&pin=3&mode=1

Set the output of digital pin 3 to HIGH ('pin=3' means pin 3, 'output=1' means HIGH):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=setDigitalOutput&pin=3&output=1

Set the output of digital pin 3 to LOW ('pin=3' means pin 3, 'output=0' means LOW):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=setDigitalOutput&pin=3&output=0

Toggle the output of digital pin 3 ('pin=3' means pin 3, 'output=2' means toggle):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=setDigitalOutput&pin=3&output=2

Set the PWM value of pin 3 to 32 (LED will glow dull. 'pin=3' means pin 3, 'output=32' means PWM value):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=setPwmOutput&pin=3&output=32

Set the PWM value of pin 3 to 255 (LED will glow bright. 'pin=3' means pin 3, 'output=255' means PWM value):
http://us01.proxy.teleduino.org/api/1.0/328.php?k={key}&r=setPwmOutput&pin=3&output=255

**Step 3: Further Reading**

Controlling an LED is just a very simple example of what can be achieved by using the Teleduino Arduino library/sketch.

---

Source: https://maker.wiznet.io/WIZnet/projects/control-an-led-over-the-internet-via-arduino-with-teleduino/