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Lishui LSW1702-1F STM32FEB Help with torque sensor connection
- Thread starter mhmt
- Start date
stancecoke
Minor legend
Strange, that's the first Lishui controller that I see, where the connector pins are not labelled properly on the PCB. Perhaps you can mark them as good as you can on a photo on basis of the wires with obvious functions.
So you have to identify the pin SP (Throttle) and/or AD1 (Torquesensor) on the remaining pins of the header. Both will have 0V to GND when the controller is switched on. If you check, which of the remaing pins are GND and 5V supply, there are not left many candidates, I guess.
So you have to identify the pin SP (Throttle) and/or AD1 (Torquesensor) on the remaining pins of the header. Both will have 0V to GND when the controller is switched on. If you check, which of the remaing pins are GND and 5V supply, there are not left many candidates, I guess.
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I replaced my motor with a TBK-100AD CST. My current controller has a speed limit, and the speed doesn't exceed 12 km/h. I couldn't solve the issue through the display settings. My display uses UART Protocol 2. I bought the LSW controller from a seller who deals in unclaimed customs goods. Luckily, there was no epoxy potting inside. The circuit board is in two pieces. The board housing the chip has 14-pin and 15-pin sockets, and half of them are empty. I figured I could connect my torque sensor to the empty pins. As you mentioned, there are no descriptive labels or markings on the board.
stancecoke
Minor legend
Identify the pins with GND and +5V supply first by a continuity test of the red and black wires of the PAS connector. Then search the pins with 0V on the remaining unidentified pins (see updated post above).
Does the blue wire go to the AD1 pin?
stancecoke
Minor legend
Which blue one, there are many blue wires 
Blue on the three pin JST SM connector is PAS1, TA (PB8)
Blue on the three pin JST SM connector is PAS1, TA (PB8)Do you have a link? This seems to be an intersting controller
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I just found this on AliExpress:Which blue one, there are many blue wires
Do you have a link? This seems to be an intersting controller
LSDZS E-Bicycle Accessories Brushless Motor Controller(customized) 36V 15A Electric Bike LSW1702-1F
stancecoke
Minor legend
Hm, this item is not available in Gemany.
Sadly most ebike parts are geo fenced for Germany meanwhile, I guess I would have to use a VPN to turkey
No products are coming in from abroad to Turkey anymore. To bring anything in, you have to go through official import procedures. There are a lot of expenses and legal obligations. Someone else bought it, but it got stuck at customs. Then another person bought this product from customs through an auction. They put it up for sale from within Turkey. That's how I was able to get itHm, this item is not available in Gemany.
Sadly most ebike parts are geo fenced for Germany meanwhile, I guess I would have to use a VPN to turkey
I couldn't do it. It turns out I don't have the necessary electronics knowledge. I don't have enough background to figure out something new. I couldn't identify the circuit board. However, if there were a step-by-step guide, I could get this done. Thank you for the software. I assume the Java interface is your design.
stancecoke
Minor legend
Don't you know google translate?!
You need only 4 wires of the 6.
- GND
-5V
- 2-Grün (Kadenz)
- 3-Gelb (Drehmoment)
controller --> torque sensor:
GND --> GND
5V --> 5V
TA-PAS --> 2-Grün (Kadenz)
AD1 -->3-Gelb (Drehmoment)
Have you identified the pins with 0V to GND whithin the unused pins on the header that are not GND nor +5V?
One of them is AD1. As the PCB is not potted, it should be quite easy, to follow the traces from the PB1 (AD1) pin of the processor to the header. There will be a resistor in the path, as far as I can see from your photo, you should test the continuity from the the marked resistor pad to the connector with your multimeter in "beep" mode.
You need only 4 wires of the 6.
- GND
-5V
- 2-Grün (Kadenz)
- 3-Gelb (Drehmoment)
controller --> torque sensor:
GND --> GND
5V --> 5V
TA-PAS --> 2-Grün (Kadenz)
AD1 -->3-Gelb (Drehmoment)
Have you identified the pins with 0V to GND whithin the unused pins on the header that are not GND nor +5V?
One of them is AD1. As the PCB is not potted, it should be quite easy, to follow the traces from the PB1 (AD1) pin of the processor to the header. There will be a resistor in the path, as far as I can see from your photo, you should test the continuity from the the marked resistor pad to the connector with your multimeter in "beep" mode.
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Thank you very much. I didn't even know how to do this. I have identified two empty GND traces and one 5V trace using the multimeter's continuity mode. I will try to determine the AD1 and TA-PAS pins using the method you suggested. I am learning this alongside you.
stancecoke
Minor legend
Often there is just one hardware filter (resistor in the track + capacitor to GND) so you can just check if you find a direct continuity from the resistor pad to one of the header pins.
If you don't have success, try to search for a tutorial on YouTube e.g., how to follow tracks on a PCB. But this PCB looks so tidy and simple, that you should manage it yourself quite easily.
As far as I could trace, I found the input next to the brake inputs. I hope it's the right one. I am going to connect the PAS cables + the input I found to the torque sensor and give it a try. I hope it works.
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