SetPin(GPnn), FIN query

Author Message
carlschneider
Senior Member

Joined: 04/08/2023
Location: South Africa
Posts: 158
Posted: 03:43am 26 Aug 2023      

Thanks for the feedback @chopperp and TassyJim.

I have tried longer gate periods but the result is always an integer value, even printing str$(pin(GPnn),6,4).

I have used PULSIN to measure the period and using that to determined the frequency. It measures period in µs.


Sub Freq
TimeEnd=Timer
Period%=Pulsin(GP22,0,25000,25000)
Period2%=Pulsin(GP22,0,25000,25000)
Period3%=Pulsin(GP22,0,25000,25000)
Period%=(Period3%+Period%+Period2%)/3
DeltaTime=TimeEnd-TimeStart
Freq!=(1000000/Period%)/2 ' Measuring PWM 50% duty cycle so two edges
Frequency$=Str$(Freq!,6,2) ' used in the JSON string to talk to the graph
TimeStart=Timer
End Sub


This subroutine is called by a 1s Tick. Interestingly the DeltaTime is rarely 1000ms, usually under.



Frequency to 2 decimal places. Target frequency for the PWM output I'm measuring is 50.01Hz.




Using the Pin(GPNN),FIN would just have been far more elegant:)
Edited 2023-08-26 13:47 by carlschneider