oPossum Posted 11 March 2012 – 01:37 AM
Frequency Counter using Launchpad & Nokia 5110 LCD
This is a simple frequency counter with a range of 1 Hz to 16 MHz. It uses the 32 kHz watch crystal so the accuracy is good enough for many applications. Gate time is automatically set to 250 ms or 1 second.
There is no signal conditioning (front end), so it is limited to 3V logic levels signals only! It is intended to be used with digital circuits like another MSP430 or 74HCxx circuits. It is not a substitute for a proper commercial frequency counter.
How a frequency counter works: Fundamentals of Electronic Counters by Agilent
counter430.png 30.73KB 1837 downloads