105c driver testing?

Can only see one diode, on the output side of the board near the red power out wire…is that the one?

Appears to be open circuit using cheap DVM diode function

Battery voltage on one side of the diode …4 volt and 1.3 volt on other side of the diode and pin 8

OK, so it looks like the diode.
??

Found a diode that works and all good….but before I put it back i the pill…it looks like the pill, although the correct diameter, the shoulder interferes with the tops of the 7135’s and touches the outer tab . The 7135’s are too close to the edge of the board really.

Pill is just a hollow tube…the LED star is not connected to a heat sink, it is just sitting on the edge of the star.

No problem, those tabs are connected to batt-minus anyway :-)

Great, thanks.

Been back and edited my post you quoted…

Ok, so working great, but a question

What is the diode there for ? Is it merely reverse polarity protection.
That diode produces a voltage drop of approx 0.7 volts right? So does this not impact on run time?

The MCU will be detecting a cell voltage less that diode drop. ?

What am I missing? Could I run without that diode? Need to know the power requirement of the chip I suppose.

Yes you could run it without the diode, no reverse protection and the low voltage protection flashes or stepdown or whatever won’t be right, but yes…it is possible

Neil, the 105c has been dissected 6 ways from Sunday buy members here.

Check out the 2nd picture in this link for a clear view of the traces of the board.

Hah…that is one of the main images I use as a template for some of my designs

Comfychair is one of the drivah mastah’s here on the forum…

Edited

Oh yes of course, the MCU is programable, so the LVC setting will have been set to take account the drop. I went and grabbed the Atmel ATtiny13 pinout and went to Dr.Jomes page about his firmware and slave board wiring. I got my head around things a bit better now.

Oh yes of course, the MCU is programable, so the LVC setting will have been set to take account the drop.
I went and grabbed the Atmel ATtiny13 pinout and went to Dr.Jomes page about his firmware and slave board wiring. I got my head around things a bit better now.
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Look in on JohnnyC’s STAR firmware, you can tweak the level it goes into it’s low voltage mode…you would have to test it out w/o the diode set it from the stock 130 to say 120 or lower or something then compile but it is adjustable

I’ve been looking into firmware flashing and think I’ll pass.
On the e-bike controllers the job is very easy, TX/Rx pins on the board, nice GUI interface, adjust settings and hit the flash button, but that is only changing certain settings. Looks like changing making firmware on these is a little more complex. More than I need to get in to.

I finally repaired a farm tractor exhaust manifold the other day, bought the parts 18 years ago. Got a Harley in bits 4 years, and two e-bike builds on the go, plus Fordson Dexta restoration. I took 3 weeks holiday, now over, and all I have done is start a new project… flashlights… don’t need to get deeper into this !

Grrrr. What is it with this damn forum software that it had to hijack the first line of each post, use it as a subject line , and in doing so, screw up and quotes.

AAHHHhahahahha too late, bud :money_mouth_face:

I know :frowning:
Been looking up SOIC clips already

Here ya go….

I don’t see any pics on the link

Gee, thanks. !!

Here’s another.

one of us….one of us :smiley: