Speedo out to drive DC motor

tobmag · Post by **tobmag** » Fri Dec 28, 2012 12:33 am

Many Thanks Lance.

Yesterday I was checking all components that they really are in the right place and in the correct direction. All OK.

After that I just hooked it back up and switched it on....speedo just going crazy up and down, SP1 to follow the madness.
Just pulled the 12+ to SP1 and it all went back to normal...

I also found some soldering that looked a bit suspicius so re-welded them,
After that I had another good scrub with isopropyl and now been sitting over night to dry up.

I'll load the code later tonight but really think its hardware related now, I passed by a local tech-store and ordered a USB scope.
Will have it here on wednesday next week so then I can start to dig into this better.

Im not using the DC motor as load anymore, just hooked up a normal 12v lightbulb while testing

Thanks for your pation Lance.

BR//Tobmag

Bernard Fife · Post by **Bernard Fife** » Sat Dec 29, 2012 9:25 am

Tobmag,

We will get this sorted. I haven't been able to look at the hardware, because my test bench is tied up with microTCU testing. So I have been looking into the code with nothing found yet. However, I will try to get set up to test the sp1 output hardware in the next day or two.

Lance.

tobmag · Post by **tobmag** » Tue Jan 01, 2013 11:03 am

Lance

Ok I've tested the code and its counting up at each gearshift.
So I'll wait for the scope to arrive so I can trace things better.

Log attached

BR//Tobmag

Bernard Fife · Post by **Bernard Fife** » Tue Jan 01, 2013 2:42 pm

Great, thanks for checking that. I'll try to think of some other things I can do to the code to help troubleshoot. Lance.

tobmag · Post by **tobmag** » Wed Jan 02, 2013 1:18 am

Lance.

Below done with the stim:

When the SP1/2 are active I have problems with TS going off line, as soon as I set the values so they are disengaged its all OK.
I set all values all the same for SP1 and 2 using speed as index, at zero speed I measure 5V at SP1 and 7V at SP2....
Also when they are inactive (LED is out) I measure 10V on both SP1 and 2, that means to me that I get a positve signal from somewhere when the circuit should be only on negative side.

I did also bridged the "up" button in "pressed" position so now hopefully the code will think that the "manual" mode switch is active(wired according to the manual)

I also checked a bit on the speedo out circuit, I guess I need the scope to see the signal properly coming out but just measuring the hz its very jumpy, it does increase with speed though. I also expected a DC signal but can get any reading then, swithching over to AC I have about 5,5V.

BR//Tobmag

tobmag · Post by **tobmag** » Thu Jan 03, 2013 10:11 am

Oscilloscope on back-order, will only get it after the 12th.....

//Tobmag

tobmag · Post by **tobmag** » Mon Jan 21, 2013 1:00 pm

Got the scope finally and did some measuring directly on JP7, jumper removed.
pics showing outcoming signal 0-100% pwm.
Seems to be a very noisy jumpy signal....
PWM period 2ms

BR//Tobmag

Bernard Fife · Post by **Bernard Fife** » Tue Jan 22, 2013 1:57 pm

tobmag,

I didn't look at your scope shot (I don't open public compressed files of that sort - if you post the original, or a downsized version, I will have a look), but did you try different periods for the PWM to see if that had any effect?

Lance.