Hi, I bought a motor controller. It's 24v 350W motor controller. I have an arduino, a 24v brushed motor and I would like to interfacing it with them. I would like to control the motor with arduino, for example connecting the throttle cable to arduino, instead of the manual throttle and regulate the speed with a software on my notebook. Is it possible? How can I connect all the items?
This is the image of the motor controller ImageShack - Best place for all of your image hosting and image sharing needs
Thanks Richard.
I googled, but I found nothing. The only things that I know about this motor controller are:
LANTIAN ELECTRON (I it is think the producer)
LK-03 (I think it is the model)
24v
350W
then there are two labels:
a label with typed 10 06 28 and then QC: ________
while the other label with typed Q03
All other words are in chinese. 
What can I try to do to understand how it works? what are the minimum number of cables that I must connect to try it?
If it's useful I can try to remove the case to see the circuits.
Thanks Richard!!! I read but it seems not be the same motor motor controller, the label is not the same. However inside could have the same circuits, also if is it produced by an other producer. On that motor controller that you show me I read on the label 1-4V, in your opinion, is it the voltage that the motor controller receive from the throttle to regulate the speed? I hope that my controller has the same circuit. Could I try to put 2V on my controller and see what happen, or is it to dangerous for the controller? If I put 2V on my controller the throttle cable has 3 contacts How I connect them?
No, It's not the same, my controller has 8 connectors, while that controller has 6 connectors. :-[
Hi, I also have this motor controller, and I think you are lucky because a few days ago I decide to disassemble it. I'm not sure that the wiring diagram is all correct, but I think that it could be useful to understand how it's work. As soon as possible I check it again and I search any mistake that may remain.
Richard:
The connectors are:
motor (2 wire)
battery (2 wire)
brake (2 wire)
brake lights (2 wire)
indicator (2 wire)
charge (2 wire)
to put (3 wire)
power locks (2 wire)
here ImageShack - Best place for all of your image hosting and image sharing needs there is the temporary wiring diagram, as soon as possible I complete also the list of components.
Update:
with blue motor & red battery there are also red charge & red power locks while with red brake lights and blue power locks there is also red indicator. I tried to connect a 24v supply to the battery cable and I tried to measure the voltage on the "to put" connector and it is 0V. Maybe I must connect something to the power locks to power on it. In your opinion to power on the controller should I connect together blue power locks and red power locks wires? when I power on the controller the voltage between two of the three wire of the "to put" connector should be 5V?
"to put" is on the label of the 3 wire connector. Since it is the only 3 wire connector and the other connector are know, I suppose it is the throttle connector.
Hi, today I tried to connect to a 24v power supply and a 24v small motor to the controller. I connected the two wires of power locks together and between the wires red and black of the "to put" connector I measured 5.3v. I tried to connect the third wire of the "to put" connector to the + of an other power supply and the - of this power supply with the black wire of the "to put" connector. With this other power supply I tried to vary the voltage between 1V and 2.5V, however the motor was stopped. Should I connect something else? should the brake connector connected with something?
I connect the red wire of the power locks with the blu wire of the power locks. The problem is that the shop hasn't the throttle and don't give me more information about it, I think he doesn't know what he sells.
Yes I must correct it. However some messages ago I said that red charge and red powerlocks are connected with blue motor and red battery (the second in the diagram) while red indicator is connected with red brake lights and blue powerlocks (the sixth in the diagram). I'm sorry as soon as possible I upload the new image. I measured between GND (3rd pin) and Vcc (13th pin) 11.8V only after the connection between the red powerlocks wire and the blue powerlocks wire (I think it is like the switch on/off). Between black indicator and red indicator 24.6V.
if it could be useful:
Z1 is a 1N4742A
Z2 is a 1N4734A
Few minutes ago I discovered an other error, C9 and R20 are in parallel.
here there is the new diagram, with the corrections:
as you can see I add also a connection between gnd of lm339n and the third sets of wires (black battery & black charge & black to put & black brake & black indicator), now the lm339n seems correctly powered.
I resolved the problem. I used a 10K potentiometer between the red and the blu wire and the motor spins and change the speed. 
Now I must replace the potentiometer with a out pin of arduino and regulate the speed via software. Is it correct to connect a analog output of arduino to the blue wire (throttle) and the gnd of arduino to the black wire (throttle)?