I think you need to look here: Pulse monitoring on a Pi - #3 by pb66
Paul’s script there appears to be using pins 13 & 15.
If the software is applying a pull-down, you connect the SO output between the GPIO pin and the 3.3 V power.
I think you need to look here: Pulse monitoring on a Pi - #3 by pb66
Paul’s script there appears to be using pins 13 & 15.
If the software is applying a pull-down, you connect the SO output between the GPIO pin and the 3.3 V power.