Grumpy_Mike:
anyone dealt with this before
You are not the first by any means. Assuming your servo powering PSU has it's ground common with the arduino, you need decoupling on each motor's supply. You can try with just capacitors but you might need two capacitors and an inductor in a Pi configuration on each motor.
You could also try a pull down resistor of about 4K7 on each of the servo's input lines close to the servo itself.
I notice you are using pin 1 for one of the servos, this is a bad idea as this gets used by the serial communications used to upload code to the board. The same goes for pin 0.
Hello
Thanks for the suggestions
Im curious why you suggest a cap.
You mean a cap on the signal line?
Interesting. I don't think i have ever experimented with caps on a square wave signal. Normally i would say it would have no effect but because there is oscillation in the signal it may. Im not sure if it will do any good though.
Any recommendations on cap size and type?
electrolytic? disc? ceramic?
How is a pull down going to help? The PWM is Constant
Can you please explain ur theory?
Thanks for the ideas