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Timers and
Counters Circuits, Page 3b Timers & Counters:
#-AB-ENext F-L
Previous F-LM-S T-Z Last Updated on:
Monday, October 03, 2011 06:08 PM
Circuits Designed by Dave Johnson, P.E. :
HONEYBEE
COUNTER
I designed a circuit similar to this one a long time ago to help a beekeeper count
the number of bees going into or out of a hive. The low power circuit uses a slotted
opto-sensor to detect the passing bees. The circuit advances an electronic counting
module whenever a honeybee passes through the sensor. The device only counts the
number of bees going through the sensor. A different circuit would be needed to
count the number of bees only going out or only coming into the hive.
LONG
PERIOD COMPUTER WATCH DOG TIMER
This circuit uses a simple 4060 IC oscillator/timer which is reset periodically by a
computer. Should the computer fail to send a pulse, the output changes state. The
time can easily be set from seconds to hours.
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