Meet IOIO - I/O for Android

I'm very excited to announce the launch of a new product I've been working on for the past months!

IOIO (pronounced: yo-yo) is a product which lets you connect electronic circuits to an Android device and control them from an Android application.

It is comprised of a small (2.7x1.2" = 7x3cm) PCB that connects to an Android device with a USB cable and a software library (Java .jar file) that you use in your Android app which handles all communications with the board.

No firmware programming is required - only Android application authoring with a very simple API (see examples below) for controlling the pins on the board. No modification of the Android device is required - you avoid the complication of modification and the voiding of warranty.

IOIO is available for backorder online from SparkFun on this page.

The first few boards will ship within a couple of weeks. Around that time, the entire software and hardware are going to be 100% open-source with a permissive license.

Main features:

48 total I/O pins - all of which can function as digital inputs and outputs.

Up to 16 analog inputs (10-bit).

Up to 9 PWM outputs.

Up to 4 UART channels.

Up to 3 SPI channels.

Up to 3 TWI (I²C-compatible) channels.

On-board switch-mode regulator providing up to 1.5A of 5V supply. Can charge the Android device as well as power a couple of small motors.

Bootloader on the board pulls firmware off phone, enabling OTA firmware upgrades and application-specific firmware.

Pulse-width measurement, capacitance sensing and more (will be pushed with first OTA firmware upgrade).

Example Code

Just to give you a hint of how simple it would be to write apps using IOIO, here is a small snippet from an app, which controls a single servo motor (on pin 12) and reads a single potentiometer (on pin 40). Exception handling and proper closing have been omitted for clarity.

ioio.waitForConnect();

AnalogInput input = ioio.openAnalogInput(40);

PwmOutput pwmOutput = ioio.openPwmOutput(12, 100);  // 100Hz

while (true) {

  float reading = input.read();

  pwmOutput.setPulseWidth(1000 + Math.round(1000 * reading));

  sleep(10);

}

Read more: Microcontrollers, Electronics & Robotics

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