This is a simple Android app that uses the light and proximity sensors on a mobile device to count push-ups. The app is designed to be easy to use and can help users track their progress as they work ...

A light source and photosensor combine for effective, reliable, non-contact proximity detection of nearby objects. Part 1 of this article looked at the principles and three basic approaches to optical ...

Disclaimer: This is not an officially supported Google product. The board uses two IR LEDs with a modulated signal (both either 38KHz or 56KHz, depending on the receiver type) whose light reflects off ...