PAS sensor connected to wheel

TommyCat said:

Just from miswiring to something you shouldn't have...



To avoid confusion, I would refer to the brake cable's RED wire or signal wire going to the brake connector as "signal". Not 5vdc...
I.E. Red is signal, Black is ground.


This is what I would do.



Review Beemac's wiring instructions in the other thread, as I found them accurate and helpful.

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Mm ok.
So the brake wires are called signal and ground. Understand. The red one is a signal wire. Makes sense.

Yeah I like his drawing and his idea about hooking up the gear sensor to one of those brake wires via the signal wire, and then hook up its ground and 5v-wire to the pas
.
I just can't get a hold of him anymore. So I don't know if I thought I should back off from the project after doing the readings with the multimeter. As I understood him he meant that if the voltage went above 1,5 and all the way up to 3-5v this could potentially create shorts in this entire operation, since that was too high of a voltage, to do this whole thing. But I am not sure if he thinks I could try anyway. Despite the high voltage. I haven't got a hold of the dude but asked him in the other thread.

That is why I am a bit wary about trying it before I get an answer.

But if I don't do it this way I should be able to splice two extra brake wires into the two esisting ones. Putting the magnets at the shift lever. Creating a kind of homegrown "shift sensor" that works like a brake sensor along the ordinary ones on the brake handles. But instead these will cut power off when moving the shift sensor with my thumb. Kind of like this picture (Sorry about the drawing it is not pretty I know ). That would give me four magnets and four sensors in total if you know what I mean.

Cyclomania said:

I just can't get a hold of him anymore. So I don't know if I thought I should back off from the project after doing the readings with the multimeter. As I understood him he meant that if the voltage went above 1,5 and all the way up to 3-5v this could potentially create shorts in this entire operation, since that was too high of a voltage, to do this whole thing. But I am not sure if he thinks I could try anyway. Despite the high voltage. I haven't got a hold of the dude but asked him in the other thread.

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Hopefully he will return soon to put your mind at ease. Always a good idea to get opinions and agreement from more than one person.


As I don't know how your shifting system works exactly, I can't say about your homegrown solution. Seems a bit messy and un-needed.

But I have total confidence that the store-bought gear sensor will work.



Whilst we wait, did you have success on the speed sensor? If you have it wired, does turning the wheel by hand and giving it a spin give you some numbers on the display?

TommyCat said:

Hopefully he will return soon to put your mind at ease. Always a good idea to get opinions and agreement from more than one person.


As I don't know how your shifting system works exactly, I can't say about your homegrown solution. Seems a bit messy and un-needed.

But I have total confidence that the store-bought gear sensor will work.



Whilst we wait, did you have success on the speed sensor? If you have it wired, does turning the wheel by hand and giving it a spin give you some numbers on the display?

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Yes it works! Although it is hard to know how well it works because right now I have the front sprocket removed from the bike to be able to splice and fix wires. But I see that it lights up in red when the wheel is turned so it is definately active. This one is connected via the white signal wire from the halls and via the throttles 5v and ground.

It is supposed to be a poles per revolutions setting in P7, on the sw900 display that I have, according to this thread: Factory setting on SW900 display for P07 Parameter?

Since it is only one magnet attached to the wheel right now, that goes by the sensor every time the wheel turns one revolution, I guess this setting should be set to one ?
Or it could be that it should be set to 16, since that is the number of magnets inside a bbs02-motor, underneath the cover. But I think it should be set to one. What do you think?

Cyclomania said:

But I see that it lights up in red when the wheel is turned so it is definitely active.

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Sounds like a start but I would be more satisfied if you were actually getting a speed reading on the display.

Cyclomania said:

But I think it should be set to one. What do you think?

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E-HP said:

The one for you Bbs02 should work. It will need a 5v and ground, and the signal wire would go to the white wire on the hall sensor connector as the speed input (assuming it’s a speed input and not temperature). Magnet count would be 1.

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I agree with you both.
A reminder, you also have to set P06 for correct wheel size to get accurate speed reading.

I hope this all works out for you. During my testing questions I was trying to get you to verify these programming changes before you went to the trouble of wiring up the speed sensor. So I have my fingers crossed.