Find the PDF tutorial here: PDF

Video of the robot in action: YouTube, and another YouTube

Video showcasing the circuit: YouTube

Test video: MP4

APK Testapp: APK (Android)

App Inventor Files for Testapp: AIA (App Inventor)

APK for remote receiver: APK (App Inventor)

APK for remote sender: APK (App Inventor)

App Inventor Files for remote and receiver: ZIP (App Inventor)

MIT App Inventor and Smartphone Robot coding guide: PDF