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The "TAG" is a motion detecting alarm system for laptop computers and other high-dollar valuable items. It includes a keychain transmitter and an alarm unit. Once armed, any motion will cause the alarm unit to sound a piercing alarm tone that can only be reset using the keychain transmitter.


The 315 MHz coded signal from the transmitter is decoded and validated by an embedded microcontroller. If motion is detected while in the armed state a 100 dB alarm tone is produced by a piezoelectric annunciator. The wire tether attaches the alarm unit to the merchandise and also serves as the receiving antenna. The alarm unit is powered by a single AA battery which provides over 1 week of continuous use.

Radio Informer View All Electronic Design Projects ANI Decoder, Display Unit

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