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A decoder from a motor has 2 square wave outputs that deliver 256 pulses/revolution (duty cycle 1:1). The two outputs are 90 degree out of phase for direction information. I want to count pulse, in one direction up, in the other down. Towards this aim I attach to the first decoder output following routine: void countStep(){ if(digitalRead(_CIN2)){_pos++;} else {_pos--;} } "_CIN2" is the second decoder output and "pos" the counter variable. This works well until up to approx. 16kHz. But for higher frequencies it counts in the wrong direction. I first guessed, that the phase r
