liyin
Junior Member level 1
The circuit for the IgorPlugXP plugin for Girder has a 3.3KΩ pull-up resistor to keep the IR receiver output line high (5V).
If R1 is removed Girder doesn't recognize the circuit. If R1 is replaced with a wire Girder recognizes the circuit, but shows no activity when pressing the remote's buttons.
My question is why is this resistor necessary if the IR receiver has an internal 80KΩ pull-up resistor connecting the output line to the Vcc line.
If R1 is removed Girder doesn't recognize the circuit. If R1 is replaced with a wire Girder recognizes the circuit, but shows no activity when pressing the remote's buttons.
My question is why is this resistor necessary if the IR receiver has an internal 80KΩ pull-up resistor connecting the output line to the Vcc line.