zlacker

>>1317+(OP)
Can someone explain why the EMI would cause a Bitflip and not always a high read? Why would a pulse invert the signal that’s read? Don’t the voltages effectively get added?

>>echoan+An1
You need to think of EMI as having a magnitude and a direction. Half the time you are adding a negative voltage.

>>missin+Ep1
Since he’s using a Piezo lighter, shouldn’t it be just a single DC pulse like discharging a capacitor?

>>echoan+Uq1
Even your example of discharging a capacitor can end up with a pulse both directions, caused by the inductance of the wires.

In this specific situation, there's no common reference level, and so the induced pulse will go both directions. You can think of this as being about the edges of the pulse being the parts that actually cause radio to be transmitted, and there's both a positive-going edge and a negative-going edge on a pulse.