Lishui push button throttle to hall

[DanGT86]

I have an old Lishui controller from the late 20teens. It has a pushbutton for a throttle. Its all or nothing. When pressed the NO button connects solder pad VL to ground. There is 5v on VL.

Anybody know how to convert this to a normal ebike hall throttle? The Solder pads are labeled VP ZF VL HV HX POR

Some of these locations are grounds and others are either 2.5v or 4.5v or full 5v. Experimenting with shorting them to ground I get slightly different wheel speeds but most of them do seem to have something to do with the throttle. This leads me to believe a variable throttle is possible since the speed and voltage seem to be correlated. The label on the controller says the throttle range is approximately 1-4v.

I found some pics on the web of this same board with wires on VP and HV. I get 4.5v between those locations. None of the pics show where those wires go.

I have not had time to solder wires to those locations yet to try a throttle. I figured I would ask to see if anybody know what any of those letters actually mean.

 

[amberwolf]

It's possilbe that it doesn't have a variable throttle input, and that "VL" is just a walk mode button.

What's the controller from?


Anything that shows 2.5v is probably a serial data output.

Anything that shows 4.5v is probably a diode-protected 5v power source.

Most things that show 5v may have pullups from the signal line to the 5v power source. You can check for resistors (usually 1kohm to 10kohm) wired that way. When they are, it almost always means that's an active-low input triggered by grounding it.


A throttle input will normally have 0v on it with nothing connected, and may actually have a pulldown resistor of 5kohm to 20kohm from that signal to ground, to ensure it is never active unless a valid throttle signal is being input.

 

[DanGT86]

It is from a Clean Republic ebike kit. Its a handy little kit with a sensorless front hub. Controller and Battery are in a bag that velcros to the frame. Since its 24v and 15amps max it rides fine without a variable throttle so they just included a small tactile switch with a velcro strap to attach to the grip.

I have 2 of these full kits and this one extra controller. Since its easily interchangeable with the other kits I thought it would be nice to try it with a throttle. It would also make a nice little controller for a scooter if I could attach a throttle to it.

The tag that says throttle input 1-4v made me think the hardware is capable of this. But it wouldn't be the first Ebike controller with an ambiguous sticker on it. I have probably already spent to much time messing with it since a comparable controller from Amazon is $15. I am just really trying hard to keep this stuff out of the landfill, not give more money to the man, and get more people on ebikes.

 

[d8veh]

It is from a Clean Republic ebike kit. Its a handy little kit with a sensorless front hub. Controller and Battery are in a bag that velcros to the frame. Since its 24v and 15amps max it rides fine without a variable throttle so they just included a small tactile switch with a velcro strap to attach to the grip.

I have 2 of these full kits and this one extra controller. Since its easily interchangeable with the other kits I thought it would be nice to try it with a throttle. It would also make a nice little controller for a scooter if I could attach a throttle to it.

The tag that says throttle input 1-4v made me think the hardware is capable of this. But it wouldn't be the first Ebike controller with an ambiguous sticker on it. I have probably already spent to much time messing with it since a comparable controller from Amazon is $15. I am just really trying hard to keep this stuff out of the landfill, not give more money to the man, and get more people on ebikes.

View attachment 368255

It'll probably work with a normal throttle. A throttle has three wires: 5v , ground and signal. Try the signal wire to VL first. The other wire to the button is probably 5v, so you can use it. that leaves just a ground wire that you can splice in anywhere. There are three spare pads in the corner of the pcb for that.

Alternatively, get a new controller. They're not expensive. You can get a nice one with LCD for about $40, and you have the option of more power too if your battery can handle it, and pedal assist.

 

[DanGT86]

Got it figured out. Throttle is hooked to 5v and ground as usual and the green signal wire goes to the HV location on the board.

Also, connecting the BK1 and or BK2 to ground will stop power to the motor.

So this tiny controller just got a little more useful.