Forum >Cherokee causing feedback to arduino
Cherokee causing feedback to arduino
jdelcamp0 2017-05-22 15:32:32 2638 Views3 Replies I have a Cherokee 4wd run by a DUE.
They are powered independently, 7.4 lipo for DUE, 5x NiMH for Cherokee.
I am getting some kind of feedback when I run the motors.
as soon as I power up the motors at >50/255 PWM signal my sharp IR (GP2Y0D810Z0F) triggers an interrupt. I have added the 10uF capacitor recommended by pololu - no improvement.
If I disable the sharp I can run the motors at 100/255 pwm but at 150 it causes other sensors and the wifi to cut out.
If I leave the Cherokee switched off, the program runs for hours (I can set the motors pwm to any value without issue).
There is a common ground between the DUE and Cherokee and the 4 motor control pins - no other connections.
Any ideas on what is causing the feedback? It almost looks like the Cherokee is drawing amps from the DUE for the pwm signal. Would putting resistors inline with each of the motor signals help?
They are powered independently, 7.4 lipo for DUE, 5x NiMH for Cherokee.
I am getting some kind of feedback when I run the motors.
as soon as I power up the motors at >50/255 PWM signal my sharp IR (GP2Y0D810Z0F) triggers an interrupt. I have added the 10uF capacitor recommended by pololu - no improvement.
If I disable the sharp I can run the motors at 100/255 pwm but at 150 it causes other sensors and the wifi to cut out.
If I leave the Cherokee switched off, the program runs for hours (I can set the motors pwm to any value without issue).
There is a common ground between the DUE and Cherokee and the 4 motor control pins - no other connections.
Any ideas on what is causing the feedback? It almost looks like the Cherokee is drawing amps from the DUE for the pwm signal. Would putting resistors inline with each of the motor signals help?
2017-05-25 00:43:46 Normally you can put a 100nf cap across the motor pins, also from each pin to the motor body (hard in general as it does not stick very well). manufwi
manufwi 2017-05-24 20:34:36 Thanks, I tried this and it is much better (not 100%, but much improved).
I twisted the leads to the motors and re-routed my other wiring away from them. I may also try to add capacitors to the motors.
Again thanks. jdelcamp0
I twisted the leads to the motors and re-routed my other wiring away from them. I may also try to add capacitors to the motors.
Again thanks.
jdelcamp0 2017-05-24 13:00:48 I'd say the motor EMI is causing this. You might want to twist long cables by pairs (so they do not transform into antennas picking up the motor EMI) and put all electronics as far as possible from the motors. Maybe someone else has better motors for this job.
HTH manufwi
HTH
manufwi 