monitor an input pulse train

Posted on Feb 5, 2014

This circuit is a missing pulse detector. It is used in the_ General Purpose Controller Board with Basic Stamp 1. This circuit is used to monitor an input pulse train, and when a pulse is missed the 555 timer output will switch low. For the General Purpose Controller Board the input pulses are provided from an IR sensor salvaged from an old VCR. A

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n "All In One Remote" is used to trigger the IR sensor continuously by clamping one of the remote buttons down, which causes the remote to transmit continuously. When the IR beam is broken by someone walking past it the missing pulse circuit produces an output to the Basic Stamp. R2 must be adjusted differently for different buttons on the remote.

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