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LED Control from Android™ Device

This example shows you how to control Raspberry Pi® LED from an Android device.

Introduction

Android phones and tablets provide wireless access and graphical user interface. You can create compelling projects by using an Android device as a front end to control hardware and peripherals attached to a Raspberry Pi board wirelessly. In this example, you will configure and run two Simulink models onto Raspberry Pi hardware and Android device respectively. You will be able to control the LED on/off on Raspberry Pi board from Android device.

You will learn how to:

  • Set up network connection between Raspberry Pi hardware and Android device

  • Configure and run a Simulink model for Raspberry Pi hardware to receive UDP packets from Android device

  • Configure and run a Simulink model for Android device to send UDP packets to Raspberry Pi hardware

Prerequisites

Required Hardware

To run this example you need the following hardware:

  • Raspberry Pi board

  • Android phone or tablet

Task 1 - Install Simulink Support Package for Android Devices

You need Simulink Support Package for Android Devices to run Simulink model on Android devices.

1. Install Simulink Support Package for Android Devices.

Click link below to

Download and Install Simulink Support Package for Android Devices

2. (Recommended) Complete the Getting Started with Android Devices example in Simulink Support Package for Android Devices you just installed.

Task 2 - Configure Network Connection

In this task, you will set up network connection between Raspberry Pi board and Android device. The communication protocol used in this example is UDP.

1. Connect Raspberry Pi board to the network with Ethernet cable through Ethernet port.

2. Connect Android device to the same network through Wi-Fi. Check Settings -> Wi-Fi -> [Wi-Fi network connected] to find the IP address of your Android device.

3. Verify the connection between your Raspberry Pi board and Android device.

Execute the following command on the MATLAB command prompt:

r = raspberrypi

This command returns an object with IP address info for the Raspberry Pi board.

Run command system(r, 'sudo ping [Android_IP_Address] -c 10') with the Android device IP address found in step 2 to verify the connection. e.g.

system(r, 'sudo ping 172.31.205.40 -c 10')

Task 3 - Run Simulink Models on Raspberry Pi Board and Android Device

1. Open preconfigured Raspberry Pi Model and configure it with the IP address of your Raspberry Pi board. Build and run this model on Raspberry Pi board by clicking on the Deploy to Hardware button.

2. Open preconfigured Android Model. Double-click on the UDP Send block. Open the block mask and enter the IP address of your Rapsberry Pi board in the Remote IP address edit box. Click OK to save and close the block mask. Build and run this model on your Android device by clicking on the Deploy to Hardware button. An Android app will run on your Android device.

3. Once the Android app runs, press the switch button in the Android app and observe the LED on/off.

Summary

This example showed you how to create Simulink models that allow communication between a Raspberry Pi hardware board and Android device using UDP protocol.

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