Control LED Light Color Via an Arduino and an IPhone Over BLE

This tutorial will show you how to control an RGB LED via an Arduino and an iOS device. It will utilize the LightShow app which lets you set a single color or create a light show with a sequence of colors.

If you want to control a Light Strip check out this tutorial instead.


  • 3 x 220-ohm resistors
  • nRF8001 BLE board
  • Arduino Uno
  • iOS device

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Step 1: Attach the RGB LED

Use a common cathode RGB LED and three 220-ohm resistors.

  • The longest pin of the LED is the cathode and should be connected to the common ground.
  • Connect a 220-ohm resistor between each of the LED's anodes and the Arduino.
  • Connect the Red, Green, and Blue pins to digital pins 3,5, and 6 respectively.

Step 2: Connect the Bluetooth Low Energy Board

Connect the nRF8001 Bluetooth LE breakout board to your breadboard. Connect the BLE pins to the Arduino as follows:

  • SCK - 13
  • MISO - 12
  • MOSI - 11
  • REQ - 10
  • RST - 9
  • RDY - 2

Further information on the using the nRF8001 BLE board is available here.

Step 3: Upload the Sketch to the Arduino

Clone or download the LightShow GitHub repository at

  1. Copy and paste the Adafruit_BLE_UART folder located in the libraries directory into your Arduino/libraries/ folder.
  2. Launch the Arduino IDE and open the LightShow/LightShowArduino/LightShowArduino.ino sketch. Upload it to your Arduino board.

Step 4: Download and Install the LightShow App

Download and install the iOS LightShow app from the iTunes App Store.

Launch the app and press the Action button on the top right. Locate your bluetooth device, named "HSLight" by default, and connect to it. Go back one screen and you should be able to remotely control the color of your LED.

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    7 Discussions


    9 months ago

    The article is helpful to some degrees, but when it comes to download the app. iTune says it is not available in the US store. Why can't you upload the app codes to Github?


    2 years ago


    I use a common anode RGB LED , Is that possible , what should I change in the Arduino code please

    Kind regards


    3 years ago

    Did you write something from scratch for the iOS or did you use a toolkit like that above? and is it work for HM-10 Blue tooth

    my mail id is


    3 years ago

    Interesting - however not having the source code to the iOS app detracts from the project. How can I use the techniques you show to do something else?

    3 replies

    Reply 3 years ago

    Thanks for the reply. Did you write something from scratch for the iOS or did you use a toolkit like that above?


    Reply 3 years ago

    I started by using the Nordic code base, getting that to work, then building my custom UI on top of it. In the end I only ended up keeping the UARTPeripheral class.