2dof - another in da' house ;)

Thx for replay Pit. I think I understand. I've got multimeter and I can measure the voltage or current with it but not the power.
At the moment my pots are not mounted to the motor. They are connected only to the Arudino and MM. BTW they are 10k linear pots.

As You said I will try:

1. Check the voltage A1-B1 while turning the pot (maybe the current also)
2. Upload 0.63 and try one more time

Now I know how should it work. Maybe I should also check my Arduino UNO chinese clone and chinese MM are they OK, but I dont know how.
It's strange for me that with RacingMat code motor is turning. I cant control it at the moment but is alive. With SMC3 code something is wrong with my hardware, couse motor is dead... I'm not Sherlock Holmes but I think that motor is OK, MM is OK and maybe there is something wrong with Arduino that should control the movement.

if RacingMat's code is working fine you should go this way first?
You need only to check out the voltage. Current is not needed. Yesterday I checked your wire but could not find any faults. The MM, The Ard and the pots are connected by +5V and GND of the Ard I assume? And the pot is wired correctly as well? You know + and - are the outer in- or outputs...

Thx for checking. I have checked it for hundred times and couldn't find any problems... My pots are also seems to be right connected. SMC Utility recognizes them well.

RacingMat's code is ok, but I rather to start with SMC3. It seems to be better IMO and from what I have heard. Besides I wasn't tested RacingMat's code deeper, so maybe there will be different problems. I started with SMC3 and I really want to make it work. There must be some way with all Your help!

Now I have made measurements:

Utility is showing:



I startred from PWMmax=0 to PWMmax=73

Voltage was incresing form 0 to 0,26V at PWMmax=73 it's obvious that my motor have no power to start. At this voltage my chip was so hot that I had to turn off my PSU. Voltage at the input of MM is 12,5V all the time.

Ok, there MUST be something wrong, because I can use the MMs without cooler only for testing with especially when no motors are connected. They stay cool so if they became hot - this is no good sign. Can you check out the board of the MM if somewhere is some solder or a very thin wire where it not should be...you can help us better if you take some more photos, one detailed photo from the bird eye's perspective (high resolution), from each board, but please from the whole board...again look very exactly if somewhere is some metal which can be responsible of a short circuit.

I can't see any shorts or unwanted connections. I chcecked with the multimeter - anly pins connected are 2 GND on MM. Maybe screw cennections for wires are too close the chips on MM? But A1B1 and A2B2 are not shortened.

Here are the pictures:

Obviously damaged!

BTW you should improve your soldering skill...what is your soldering bolt?

Hey I think I found something at last!

I disconnected my motor and I checked if MM will get hot, but he won't. So I mesured resistance between + and - of unconnected motor wires and it is 0 - ZERO. Does it mean that my motor is broken and makes short circuit?

Whats more voltage between A1B1 is about 10V when no motor is connected. When I connect my motor voltage go near zero (0,3V). Looks like my motor is broken?

I dont have any other motor to check at the moment. Can I try with computer fun?

My soldering skills are not the best I know ;/ but most the time it works Tommorow I will show You pictures of my soldering bolt. The pin You showed is ok - I checked it twice with multimeter.

No, your MM is damaged.

My MM? Pit I just found small computer fan and connected it to MM. And... it works! Just like You said. Starts when I put PWMmax =3 and reacts on pot. Are You sure that my MM is broken? I'm really confused ;(

Sure - I hope not Why I resume that the MM could be damaged: first the photo which I have uploaded shows you a white spot, a wire on the board itself seems to be broken. Second if you have not 12v output without any motors connected and no power (volts) if motors are connected the MM has been damaged. A very small motor like a fan works well, but that says nothing. I hope I am mistaken but I am rather sure.

Ok, thx very much Pit for all Your help. Something is broken that's for sure... but it would be better for me if my MM was broken then my motor. Motor has cost me 6 times more ;/ Now I will wait for my next MM that is coming to me. Could You advice me how to not damaged another MM? I really dont know what I did that damaged it.

Here is my stuff. I know... there is nothing to be proud of

Recommend that you connect your motor directly to your 12V DC power supply, if the motor turns then your motor is OK. All the solder splatter and board delamination points to too much heat (or left in place too long) from the soldering iron. Are you using a temperature controlled soldering iron? Edit - seems you do - maybe it is turned up too high (picture shows it on max - not required when soldering small wires onto a circuit board) or you are leaving it on the job too long? Practice makes perfect. I like to use a iron that has a closed loop tip temperature gauge - removes the guess work.

Ok, thx for the advices I will improve my soldering skills.

I connected my motor directly to my PSU and there is also some problem... look at the video:



Motor is trying to strat but can't do it.for some reason. On the psu yellow led is on - it means a problem and probably some protection is on.

But.. if I connected my motor through multimeter (in current measurement mode) my motor works... what is going on here guys???

video with multimeter in the circuit:

@gorzasty be cautious we are mixing now different things! We did the test without motors and the MM seems to be faulty.

Your motor is fine. When you stop the motor using the volt meter the PSU is shuttung down for a second, then comes back to life...you have a too weak or damaged PSU (or you did not connected all lines of the 12V)

Perhaps you can try an other PSU?

What you can do furthermore: please check the case of the motor if somewhere the power inputs of the motor are connected with the case of the motor by accident...

So maybe all my problems come from PSU...

I used this manual to mod it

and I took volatge form two pins inside like on this picture:



Tommorow I'll try to use my car battery and we'll see.

Car battery should work anyway.

Did you enable the 12v line by placing a resistor across the sense lines? If you did then the supply is going into overload protection, if not then you need to add the resistor.

Ok I tried connect my motor directly to the car battery and it works. Motor is OK, as Pit said. Next I tried it with computer PSU and the same thing - motor works. Then I also connected it the the Ard+MM and same problems - MM is getting hot very quickly, but now motor works.

Conclusion:

1. Motor is OK
2. MM is broken
3. Ard is OK
4. PSU is broken or not properly moded

Thx Alexey, You right. I forget to add the resistor. I enabled 12V with short connection, but no resistor and voltage is maybe to high (12,8V). I disconnected it and my voltage went 11,7V. With this voltage motor connected directly to the PSU sometimes starts, but not always. I read that I need 470 ohm resistor there. Do You think this is the problem with my PSU, or I have to look somewhere else? I think 12V motor should have some tolerance and should work with the range 11,5V-12,5V.

The range is absolutely no issue and standard. I am happy you have sorted it out. BTW your matter was a big support effort Hope next time you will success.