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Motors causing power disturbance?

userHead anonymous 2014-11-30 07:18:36 15392 Views30 Replies
Hi All,

I'm building up this kit [url=http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2157124_-1]http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2157124_-1[/url]

when i run the robot, i see the activity light in the ultrasound sensor keeps lit instead of periodic flashing and the servo is showing spurious activity. This happens only when the wheel drive motors are running. I tried the motors to run in series and parallel combination. I tried removing the vin=m_vin jumper and individually powered (motors from battery pack and romeo from usb). still whenever the motors are running the sensor activity keeps lit (or high frequency blinking not as expected from the code).

Does this point to a faulty board? any other suggestions please.

Thanks in advance
2025-10-18 01:27:51

Hey there, that sounds like a tricky problem! It definitely points to some kind of electrical interference from the motors affecting the ultrasound sensor. Have you tried adding any decoupling capacitors close to the motor terminals? That can sometimes help smooth out voltage spikes. It kind of reminds me of fine-tuning settings in a game like Drift Hunters – small adjustments can make a big difference to performance! Hopefully, you can isolate the issue and get it working smoothly. Good luck! 

https://drifthunters3d.io
 

 userHeadPic Robert.Nevarez
2014-12-09 09:05:44 i tried connecting that to a different pin without pwm and observed same result. and BTW i have to add, the motors doesn't have capacitors across the terminal. userHeadPic anonymous
2014-12-09 09:05:44 i tried connecting that to a different pin without pwm and observed same result. and BTW i have to add, the motors doesn't have capacitors across the terminal. userHeadPic anonymous
2014-12-09 09:05:44 i tried connecting that to a different pin without pwm and observed same result. and BTW i have to add, the motors doesn't have capacitors across the terminal. userHeadPic anonymous
2014-12-08 07:58:46 Hello akgalp,

Sorry for the late, I'll test it on Monday. And if you get anything, please let me know.
 userHeadPic Grey.CC
2014-12-08 07:58:46 Hello akgalp,

Sorry for the late, I'll test it on Monday. And if you get anything, please let me know.
 userHeadPic Grey.CC
2014-12-08 07:58:46 Hello akgalp,

Sorry for the late, I'll test it on Monday. And if you get anything, please let me know.
 userHeadPic Grey.CC
2014-12-06 16:45:15 can someone (or dfrobot) can confirm this behaviour of romeo?
i need to make sure the romeo board is not faulty

thanks
 userHeadPic anonymous
2014-12-06 16:45:15 can someone (or dfrobot) can confirm this behaviour of romeo?
i need to make sure the romeo board is not faulty

thanks
 userHeadPic anonymous
2014-12-06 16:45:15 can someone (or dfrobot) can confirm this behaviour of romeo?
i need to make sure the romeo board is not faulty

thanks
 userHeadPic anonymous
2014-12-04 13:09:20 [quote="Grey"]
Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device.
[/quote]

I not sure i understand you correctly. The sensor is already connected to D9 userHeadPic anonymous
2014-12-04 13:09:20 [quote="Grey"]
Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device.
[/quote]

I not sure i understand you correctly. The sensor is already connected to D9 userHeadPic anonymous
2014-12-04 13:09:20 [quote="Grey"]
Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device.
[/quote]

I not sure i understand you correctly. The sensor is already connected to D9 userHeadPic anonymous
2014-12-04 12:35:19 Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device. userHeadPic Grey.CC
2014-12-04 12:35:19 Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device. userHeadPic Grey.CC
2014-12-04 12:35:19 Hi,

Have you changed the other pin to drive the Ultrasonic sensor? Like D9 and D11?
D5&D6 PWM output will use timer 0, it will interfere other device. userHeadPic Grey.CC
2014-12-03 18:16:37 Please see the videos to see the problem
[url=http://youtu.be/HICrEOkCk-U]http://youtu.be/HICrEOkCk-U[/url]  shows the expected ping sensor activity light. The motors are off


[url=http://youtu.be/gQFT_hFvopI]http://youtu.be/gQFT_hFvopI[/url]  shows the activity while motors are running

any suggestions?
 userHeadPic anonymous
2014-12-03 18:16:37 Please see the videos to see the problem
[url=http://youtu.be/HICrEOkCk-U]http://youtu.be/HICrEOkCk-U[/url]  shows the expected ping sensor activity light. The motors are off


[url=http://youtu.be/gQFT_hFvopI]http://youtu.be/gQFT_hFvopI[/url]  shows the activity while motors are running

any suggestions?
 userHeadPic anonymous
2014-12-03 18:16:37 Please see the videos to see the problem
[url=http://youtu.be/HICrEOkCk-U]http://youtu.be/HICrEOkCk-U[/url]  shows the expected ping sensor activity light. The motors are off


[url=http://youtu.be/gQFT_hFvopI]http://youtu.be/gQFT_hFvopI[/url]  shows the activity while motors are running

any suggestions?
 userHeadPic anonymous
2014-12-03 05:13:26 power supply is 7.5v. No i didn't try changing the servo pins. as i observed the condition is not related to servo, but related to the wheel drive dc motors. it condition happen only when these dc motors are attached, irrespective of servo connection.  I have also tried using separate power for dc motor (7.5v) and controller (from usb, jumper off)

EDIT - Romeo is 1.2 not 1.1. Also i disabled the servo entirely and still the problem exists userHeadPic anonymous
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