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The microcontroller might be busy reconnecting to the wifi network and therfore does not recognise the sensors input. Therefore it's essential for me to use an interrupt, except.... I could use a timer to do this? As far as I know timers also run regardless of the current software "loop"...
@KlausST: Thank you very much for clearing things up with the SMPS, isolation and noise.
@FvM: Could you please point out a little bit more in detail how to disable the regular pin function temporarily if floating is detected ?
I would implement this the following way:
Inside the ISR, check...
Thanks for your comment.
Two questions:
- Probably a dumb question, but since we are in the elementary forum... Why is there a earth referece if I touch the wire. I think the switching pwer supply creates an isolated voltage using a transformer? So there is still an earth reference? Why does...
Hello,
I have a microcontroller (ESP8266 or Atmega328p) which has one GPIO pin configured as "INPUT" with external 4k7 pullup resistor.
If I check the voltage of this pin using an oscilloscope I can see that it's near VCC (5v) with very low ripple/noise.
A 10cm wire with open end is connected...
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