- Mon Dec 25, 2017 4:29 am
#72687
and if you supply the esp and your sensor from different sources you have to connect all the gnd's,
not only the "signals"!
not only the "signals"!
- Mon Dec 25, 2017 4:40 pm
#72700
A zero return from the pulseIn means you didn't get a pulse, probably caused by the lack of common ground, as schufti says. I usually power my sensors from the board, which avoids that issue. If your dev board is plugged in to USB, then you can power the sensor from the VIN/5V pin and a GND pin. Most of the NodeMCU boards are 5V tolerant on input, so then you'd be good to go.
- Wed Dec 27, 2017 3:55 am
#72722
I had similar problems and it looked like the 'pulseIn(echoPin, HIGH)' command caused it, replaced it with the Bitfrost libray. Perhaps this solves your problem too.
