Android + Arduino + USB Host + Sensor Graph

  

A simple app to visualize analog sensor input with Android and Arduino.

For additional background information on interfacing Android with the real world, check out my other introductory tutorials:

Simple Digital Input
Simple Digital Output
Simple Analog Input
Simple Analog Output

 

Hardware

Parts needed:

  • Android Device (1.6+)
  • Potentiometer
  • Breadboard
  • Power supply
  • Hook-up wire
  • Android ADK Board*
  • – OR –
  • Arduino compatible and USB Host shield

*Supported boards include:

Google ADK boardFreeduino ADK board Seeed Studio ADK board, and DIY Drones ADK board

 

Assembly

Connect the two sides of the potentiometer to 5v and ground, and the center wiper to analog input pin A0. Here is a diagram of the completed circuit (created with Fritzing):

 

Software

Arduino Firmware

Next, upload the Arduino sketch to the microcontroller. The sketch uses the Microbridge implementation by Niels Brouwers. Microbridge uses Android Debug Bridge (ABD) forwarding over TCP, rather than the official Google Android ADK. You can checkout the source for the Arduino sketch from Github, or just copy and paste the following into the Arduino IDE.

 

Android App

Finally, install the Android Demo application onto the device. You can either download the pre-built .apkor checkout the source from Github:

git clone git://github.com/mitchtech/android_adb_sensor_graph.git

Finally upload the app to the device (or browse to this page on the device and download the apk above). Connect the Android device to the USB Host board/shield, and start up the app.

 

1 Comment

  1. I’ve a dumb question: why is the usb shield necessary? will the USB on the Arduino not provide the required interface to ones tablet?

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