Do-It-Your self Frequency Counter – Open Electronics
This challenge permits you to create a frequency counter with glorious precision and low consumption due to using a 32768Hz quartz.
The challenge is predicated on a BluePill with STM32 microcontroller. The latter receives a 10MHz clock which is multiplied to 70MHz by the inner circuit of the microcontroller and makes use of a 32768Hz clock to depend the pulses. Because of the precision of the quartz at 10MHz and the inner compensation circuit, the clock at 32768Hz will likely be corrected so as to acquire glorious precision. Alternatively, a DS3231 might be used which has an output clock on the identical frequency however temperature compensated.
The graphic show is entrusted to a 16×4 character show and there’s a rotary encoder to have the ability to differ some parameters.
