In SX Microcontrollers, SX/B Compiler and SX-Key Tool, uptonryan wrote:

Hi Robert,

Great suggestion. I followerd it using the code below.

DO

   MOVE_Mini

   TOGGLE Led
   PAUSE 100

LOOP 

Where MOVE_MINI sends commands to the pololu to move the servo back and forth.

When I Connect it to the PC via SXKey and USB the servo motors works and the LED blinks. 

When I disconnect the sxkey and usb the LED still blinks but the servo motors stop. 

I think this proves the fault is with the pololu chip or more precisely the connection between the pololu chip and SXKit. The polulu chip may be drawing cxurrent from the SXTech kit via the connection somehow and when the powered usb is disconnected this changes the signal from the sxkit to the pololu enough for the pololu to stop working.


I brought and oscilliscope today and hopefully when  hook that up that should tell me what the waveform looks like. I was thinking if I connect a 100pf cap and 100 ohm resitor in series across the pololu logic input and pololu ground that may clean up the signal. I may also twist wires together to stop them acting like antennas.

What do you think?

Ryan

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