I've warned some of you that while I'm a grizzled old coder, I am somewhat of a novice at the hardware side of things. I am now trying to "fill in the blanks". As such I am starting at the basics and trying to better understand what I've simply excepted as fact before. One thing I've been reviewing is basic analog circuitry. Really basic. Like resistor circuits.
The resistance through a pair of paralleled resistors is defined as (R1 * R2) / (R1 + R2). If R1 is 1K and R2 is 2K, the circuit resistance is 666.67 ohms. Why do you have a resistance that is less than either of the resistors?