TolpuddleSartre:
I wrote that you should increase the speed of Serial.
I wrote nothing about Serial3.
Oki. A baud rate of 300 can transmit 30 signs a second wikipedia says, so 9600 should be enough.
We don't have to transmit the final data in any high frequency later, its just that the calculation of the drawstring length must be correct!
TolpuddleSartre:
Does not match what your code suggests.float k=0.0025;
It does not no, 2.5 mm is correct.