Motorbike Alarm

electronic sentry

The principle is a very simple one: once the bike has been set on its stand, three carefully-positioned mercury switches give position information to a microcontroller, which it then memorizes when it is powered up. The surveillance starts right away; any change in the bike’s position will upset the configuration of the three switches and set off the alarm.

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Materials

120106-11.zip

Component list

Resistors
R1 = 22kOhm
R2 = 1kOhm

Capacitors
C1,C2 = 10µF 16V, radial

Semiconductors
D1 = 1N4148
T1 = BC547C
IC1 = ATTINY13-20PU (Atmel, DIP-8, Elektor # 120106-41)
IC2 = 78L05

Miscellaneous
S1,S2,S3 = tilt switch, 90 degrees, e.g. RBS040200