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.

Want to back this issue? Post a bounty on it! We accept bounties via Bountysource.

[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