Search found 8 matches

by sergeyzwezdin
Fri Aug 11, 2017 1:55 am
Forum: Technical Discussion
Topic: Controlling brushed motors with PWM
Replies: 9
Views: 6113

Re: Controlling brushed motors with PWM

deshipu wrote:
Thu Jul 27, 2017 5:11 pm
One possible difference is that Arduino UNO is 5V, whicle OpenMV is 3.3V — perhaps your motor driver expects 5V signal?
In my case the root casus was broken driver.
by sergeyzwezdin
Mon Aug 07, 2017 11:27 am
Forum: Technical Discussion
Topic: Auto-calibration for find_blobs thresholds
Replies: 1
Views: 1375

Auto-calibration for find_blobs thresholds

Hello!

We're using find_blobs for line follower robot to detect the line. It works fine, but it's very sensitive for luminance intensity.

I just wonder if there are any auto-calibration alogrithms available for OpenMV cam? If you have any ideas I'll be glad to test it.
by sergeyzwezdin
Wed Jul 19, 2017 11:34 am
Forum: Technical Discussion
Topic: Controlling brushed motors with PWM
Replies: 9
Views: 6113

Re: Controlling brushed motors with PWM

I would suggest using machine module in micropython - https://docs.micropython.org/en/latest/esp8266/esp8266/tutorial/pwm.html. Haven't had such experience yet, hope this thing works well with openMV. The plan is to test it maybe tomorrow (my robot is not ready yet). "machine.PWM" is not available ...
by sergeyzwezdin
Wed Jul 19, 2017 11:34 am
Forum: Technical Discussion
Topic: Controlling brushed motors with PWM
Replies: 9
Views: 6113

Re: Controlling brushed motors with PWM

iabdalkader wrote:
Wed Jul 19, 2017 9:52 am
I don't have a motor to test, but it seems the cam is doing exactly what you want.
Yep, OpenMV works properly here. It seems problem with motor driver. I'll investigate it a bit more.
Thank you for your help and sorry for bothering.
by sergeyzwezdin
Wed Jul 19, 2017 2:33 am
Forum: Technical Discussion
Topic: Controlling brushed motors with PWM
Replies: 9
Views: 6113

Re: Controlling brushed motors with PWM

Hi!
Any luck with it yet?
by sergeyzwezdin
Tue Jul 18, 2017 7:59 am
Forum: Technical Discussion
Topic: Controlling brushed motors with PWM
Replies: 9
Views: 6113

Controlling brushed motors with PWM

Hello! I'm trying to control brushed motor with OpenMV's PWM and getting wierd result. Wiring scheme is following: TB6612FNG dirvier used as a motor driver. There are two pins to define mode and another one for PWM. Mode pins connected to P8 and P9 OpenMV's pin. P7 pin connected to driver's PWM pin....
by sergeyzwezdin
Thu May 25, 2017 1:36 am
Forum: General Topics
Topic: Higher FPS
Replies: 38
Views: 13192

Re: Higher FPS

I tuned it a bit. I've switchted to grayscale and decreased framesize. I also decresed size of roi.
So now it's around 80FPS.

Thank you very much for your work, guys.

3.png
3.png (29.15 KiB) Viewed 13111 times
by sergeyzwezdin
Thu May 25, 2017 12:12 am
Forum: General Topics
Topic: Higher FPS
Replies: 38
Views: 13192

Re: Higher FPS

I just flashed my OpenMV M7 with your firmware, but don't any changes in FPS. It's still around 16FPS with FB enabled and around 28-29FPS with FB disabled. What I did to flash the device: 1. Connected OpenMV to Windows laptop 2. Opened OpenMV IDE 3. Without connecting to the device: Tools → Run Boot...

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