Giveaway wireless sensors for large-group interaction

We have developed a small, handheld or wearable, wireless motion sensor that sends out a short RF pulse whenever it is jerked. The hardware is minimal, as it mainly includes only a piezoelectric foil accelerometer, a CMOS timer, and a single-transistor 300 MHz RF transmitter. As such, the onboard battery should last for many years, and the cost is

• Type: Conference
• Year: 2004
• Where: CHI
• Authors: Mark Feldmeier, Joseph A. Paradiso
• Keywords: CHI 2004, Human Computer Interaction, MHz RF Transmitter, Piezoelectric Foil Accelerometer, Short Rf Pulse