25$ 1500w controller wiring question

carlhook · Sep 18, 2019

Hey there, new to this forum - amazing knowledge and info all in one place - neat!

As this is a no-name. no brand type of controller I don't know how to find the answers for my questions except to create a post.

I have a K type motor kit+ LCD3 on my bike now, recently the original controller blew the f up when I tried to reflash its FW (reflashed the wrong version) and it blew out the LM317 and bunch of other stuff.

As the controller had been through years of abuse and I most probably had killed the MCU, I just grabbed this bad boy from Aliexpress https://www.aliexpress.com/item/33052713173.html?spm=a2g0s.9042311.0.0.27424c4dZ0Ig5u

Problem is it uses some random 1 wire speedometer interface which, off course, wont work with my lcd3.
As I am in works of building my own speedometer unit thing, I am in the search of any info regards the protocol this one line speedo could be using.

Also...can anyone drop some links or photos of the speedometer that should fit this controller?

I do know that this is a shit controller but it should work wonderful for what I am doing now - building a test bed for a project of mine.

Later on I am thinking of using the QS 3kw motor and their SVMC controller, so no hate regards the cheapness of this controller is needed

E-HP · Sep 18, 2019

You'll probably just need to get a regular bicycle speedometer rather than go through the controller. The controller has no way of knowing what size wheel it's driving and what speed the bike is going, whereas your old controller had an ability to program in those parameters.

EDIT: Welcome to the forum, by the way. :thumb:

Voltron · Sep 18, 2019

I looked at your link, but couldn't tell what wire you meant...

E-HP · Sep 18, 2019

Voltron said:
I looked at your link, but couldn't tell what wire you meant...

I think he means the one marked: "a: Instrument plug"

Voltron · Sep 18, 2019

Yeah, that would be a weird one. The single wire thing is strange, as it would have to hook to something grounded back to the controller, right?

And I've thrashed several of those generic, cheap ass, not meant for display control, three speed, dual mode suckers, and aways gotten a high money to fun ratio out of them, so no hating here! There's always threads on here where, instead of being out riding, people have been trying to figure out their sophisticated, but complicated controllers... for months or years at a time!

amberwolf · Sep 18, 2019

The "speedometer" wire is almost certainly either a full-voltage motor phase output (common enough on random controllers I've had and seen here on ES), or a motor hall sensor output.

You can easily trace the wire inside the controller on the circuit board to which one of those it connects to.

It would require a ground reference, so my guess is that it assumes you're powering the rest of the speedo display (like on a scooter) from either direct battery power or a non-isolated DC-DC, so the battery ground is the system ground.

carlhook · Sep 19, 2019

Wow I am impressed by the rapid responses from all of you.
Huge thanks for the input, will take it apart and check out the wiring + upload photos here tomorrow.

:flame:

pullin-gs · Sep 19, 2019

Good cheap controller......I have two of the 38amp (1000W) versions.

carlhook · Sep 20, 2019

Here are some photos of the controller.

As amberwolf stated - the speedo output is full voltage motor phase output - could do some filtering and with usage of another mcu turn that into rpm - then into speed. Not a super fan of that.

It uses the Sinowealth SH79F1611U MCU and has a place for flashing (looks like JTAG)...yet no idea if the existing opensourcebikefirmware software would support this.

From what you can see, any ideas if its possible to get a something like I2C or other usable output of things like voltage, speed, rpm, temp, throotle input?

Or to retrofit a K LCD3 on it?

25$ 1500w controller wiring question

carlhook

1 µW

E-HP

10 GW

Voltron

1 MW

E-HP

10 GW

Voltron

1 MW

amberwolf

Administrator

carlhook

1 µW

pullin-gs

1 kW

carlhook

1 µW

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