3-digit frequency meter for SwissFlow flowsensor
This schematic is ment to digitally display the output of my electronic Swissflow SF800 flow sensor. This sensor puts out an open collector square wave signal (like a fan RPM monitoring signal) between 50Hz and 2000Hz . By dividing the measured frequency by 10 and putting the decimal point at the right place you get directly a display in liter/minute.
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