pulseIn does not return 0 on timeout (it returns 1 or timeout value depending on pin state)

[darkskiez]

In core_esp8266_wiring_pulse.c, it seems to return duration=timeout rather than duration=0 on a timeout, or, because it resets the start time after a timeout, it can also return duration=1.

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[darkskiez]

Whilst you're in that file, you could remove the pinMode setting, I may have set PULLUP etc.

[framb00s]

I have the same problem
const int dustPin= D2;
pinMode(dustPin,INPUT_PULLUP);
int i=0;
void loop() {
duration = pulseIn(dustPin, LOW);
if(duration!=0){ // number positive readings
i++;
}
lowpulseoccupancy = lowpulseoccupancy+duration;
.....
give with nothing attached after 30 seconds 30 reads (i==30)
and a total pulse-low_time between 30 and 35

[devyte]

@igrr the referenced PR was merged quite some time ago. Can this be closed, or is there something pending?

[devyte]

@me-no-dev I just realized this is assigned to you, maybe you're the right person to ask?

[me-no-dev]

Yeah I have no clue how and when I assigned this to myself. I guess it should be closed, unless the current implementation also does not work

[devyte]

Alright, closing. If there is still a problem, let's handle it in a new issue.