A simple app to visualize analog sensor input with Android and IOIO.  The example uses a rotary potentiometer, but could easily be used with other sensor inputs such as temperature or ambient light.

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

Android + IOIO + Simple Digital Output

Android + IOIO + Simple Digital Input

Android + IOIO + Simple Analog Output

Android + IOIO + Simple Analog Input

Background on Android development, IOIO, and electronics:


IOIO for Android Beginners Guide


Android Developer’s Guide


Parts needed:

  • Android Device (1.6+, 2.1 for Bluetooth)

  • IOIO (available at Sparkfun)

  • Rotary potentiometer

  • Breadboard

  • Power supply

  • Hook-up wire


Connect one side of the potentiometer to +3.3V, the opposite side to GND, and the center wiper to the desired analog input pin on the IOIO. The example uses pin 34, but can be used with any other pin that supports analog input (pins 31 – 46 on the IOIO). Here is a diagram of the completed circuit (created with Fritzing):


Get the source

With the circuit assembled, the next step is to get the demo application on the Android device. You can either download the pre-built .apk or checkout the source from Github:

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

If you are building from source, you will also need to import the IOIO Library project, and optionally the IOIO Bluetooth library projects, both available here:

git clone git://github.com/ytai/ioio.git

Install, connect, profit!

Finally, upload the app to the Android device (or browse to this page on the device and download the apk above). Connect the device to the IOIO, and start up the app.

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