Micro PEsT Scarer by Mark Stuart

Everyday Practical Electronics, July 1997
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Micro PEsT Scarer keeps pe(s)ts away from gardens, flower beds,
newly-sown areas etc.
 
MicroPEsT is a 12C508 microcontroller-based project which drives
a 32kHz ultrasonic transmitter with short, high-power pulses at
random intervals of between 1- 4 seconds.

The 12C508 is an 8-pin d.i.l. one-time programmable device with
internal clock and up to 6 I/O pins.

Last updated 4th June 1997.