Arduino Open Source X-PID firmware incl.360°option

[Tombo]

Hi,
power offset is set to 0. The noise and led lighting begins after converter is startet. And the pot signal gets rough until i switch the powersupply on. This happens with both h bridges so i think there is a converter problem.
http://www.youtube.com/watch?v=m14Rnoo3Qf8&feature=youtu.be

[ericRacer]

Hi.
@sirnoname,
I have a question for you ! I want to change your code because i wish to use 4 motors and later 7 motors (maybe) and i want to use the USO output of X-Sim. There are some thing i don't understand about the PID in your program. I know that the PID must be called at an interval of time very constant. Last year i had problems with my code when i was using the USO output. The communication was breaking the interval of time of the PID. Then i wonder what is your trick with your code ?

[sirnoname]

-inline parser with no break from serial port / asynchron to serial port
-tested about five PID algorithm out of the robotic section and this was the best one with floating point unit at MCU
Yes the intervall must be exact, else you could not outtake the time value from the formula.

Tell me more about 4 motors??? The arduino do not have 4 equal PWM outputs.

[ericRacer]

-Tell me more about 4 motors??? The arduino do not have 4 equal PWM outputs.

You're right, but i was thinking about the arduino Mega2560.

thanks for your explanation
Eric

[Tombo]

Hi,
anyone has tried this H-bridge? For me it looks good and need no code changes or i'm wrong?
http://www.ebay.de/itm/High-Current-Dual-Motor-Driver-Module-Board-with-Heat-Sink-PWM-Signal-NEW/221197919764?_trksid=p2045573.m2042&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D15813%26meid%3D589735515760674518%26pid%3D100033%26prg%3D7513%26rk%3D3%26rkt%3D4%26sd%3D200951683458%26

[ericRacer]

Hi,
anyone has tried this H-bridge? For me it looks good and need no code changes or i'm wrong?
http://www.ebay.de/itm/High-Current-Dual-Motor-Driver-Module-Board-with-Heat-Sink-PWM-Signal-NEW/221197919764?_trksid=p2045573.m2042&_trkparms=aid%3D111000%26algo%3DREC.CURRENT%26ao%3D1%26asc%3D15813%26meid%3D589735515760674518%26pid%3D100033%26prg%3D7513%26rk%3D3%26rkt%3D4%26sd%3D200951683458%26

I bought the same one and very easy to wire, just to follow the picture on the first post. I didn't try yet with a big motor but it is works fine with a little one (for testing). For me i needed to add an optoisolator between the arduino and the INA1 (input) of the driver.

ps.: here is the optoisolator i used : https://www.sparkfun.com/products/9118

[RafBR]

I have noticed that some people use the arduino with Synaptrix and others with USO...
What are the advantages and disvantages of using one or other of this two methods for output?

And if I want to drive three motors (3dof) with two arduinos, does it matter if I use USO or Synaptrix? Both can handle it?

Today I will finish my optocoupler board so Im planning to test the arduino with DSMHB
Ill will keep the progress posted.

my regards,
Rafael.

[RacingMat]

Hi !

@ Rafael :You need only 1 arduino for 3 DOF but H-bridge accordingly to motors number.

I'm using USO and i have never used Synaptrix : sorry !

@ ericRacer : could you tell us what happens without optoisolator ? And why only INA1 ?
Thks

[RafBR]

most people say one arduino would be slow for more than two motors.

[RacingMat]

Ah, ah ! I would be very interested in seeing any harness test...