50 MHz range frequency counter using AT90S2313
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A wide range frequency meter is an useful tool for an electronics lab. This projects describes a frequency meter based on AT90S231 microcontroller that can measure input frequencies up to 50 MHz. The measured frequency is displayed on 6 digit multiplexed seven segment displays.
It uses two external high-speed 8-bit counters (74HC590) in cascade to count the incoming pulses. Depending upon the input frequency, the counting interval for the external counter circuit is changed by the microcontroller for getting better accuracy. The firmware for AT90S231 is provided in C.
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To measure the electrical energy used, one needs a power monitor. Power meters and panel meters come in handy, too. One of the mainstays of electronics engineering is electronic test equipment, also known as testgear or benchtop.