Analog power meter reading TCRT 5000

[mikee]

Hi Guys,
Does somebody have working pulse meter with TCRT5000 on analog power meter (Aluminum rotating wheel). I´m fighting with it right now and I need some help. Do I need to modify the sketch? I´ve adjusted pulse count according to power meter specs. The sensor is on all the time (while white / Al part of wheel) and turns off during the black part of wheel. During on time sends the sensor loooot of impulses, so I had my consumption up to 300 kWh a day and usage up to 100kW. Had someone same issue? Thanks a lot

[mfalkvidd]

@mikee this part in the example sketch

      if (interval<500000L) {
        // Sometimes we get interrupt on RISING,  500000 = 0.5sek debounce ( max 120 l/min)
        return;   
      }

stops the sensor from triggering too often. Do you have this part in your sketch? If so, maybe increasing to 1 second or so will take care of the problem?

[mikee]

Yes I´m using example sketch. So my interval could be up to the fastest theoretical revolution ?

[mfalkvidd]

@mikee that's correct

[karlheinz2000]

Most of these cheap boards do not have any hysteresis and tend to oscillate during output switching.
Populate a resistor (100k...330k) for hysteresis and remove a capacitor. I my case this did help.
Unfortunately in German, see the picture:
https://forum.fhem.de/index.php/topic,54408.msg459962.html#msg459962

[mikee]

Thanks Guys!
I have edit the sketch and modified the sensor. Records made during night are finally closer to real situation. I need to correct pulse count.
@karlheinz2000 - are you using digital or analog output as on FHEM forum? (Danke, fuer Deine Anweisung)

[karlheinz2000]

I use digital output. The R&C modification works only with digital output.