I am using the following setup on my Arduino UNO to measure cpu fan RPMs:
The code is set to bring the trigger pin for each transistor high when it is checking that fan's RPM and FreqMeasure.h is then used to check the frequency of the signal on pin 8 which is then translated to RPM and sent to the LCD display.
I am experiencing reading issues and suspect that the signal is remaining on the measuring bus during the subsequent reads, however before revamping my code I simply wonder:
Is my circuit logic sturdy? I am just getting my feet back under me with microprocessors and have always found transistors to be a tricky subject, thanks in advance for your help!
If you'd like to see more info all can be found on GitHub.