Pedal sensor voltage

[betisbikes]

Hi Guys

I apologise if this question has been answered loads of times, but I have searched the forums and haven't found the answer.

What should the signal voltage coming out of a candice pedal sensor be ?

I have a new KT controller and a KT pedal sensor.

The input voltage is 5 volts as expected, but the output when turning the pedal is only 2 volts, and I am I right in thinking it isn't enough, as the pedal assist isn't working.

It could possibly be a duff pedal sensor ?

The throttle works fine, and it is a older Raleigh bike that I am getting rid of the torque sensor system as I can't get parts.

Thanks. Ian

 

[saneagle]

Hi Guys

I apologise if this question has been answered loads of times, but I have searched the forums and haven't found the answer.

What should the signal voltage coming out of a candice pedal sensor be ?

I have a new KT controller and a KT pedal sensor.

The input voltage is 5 volts as expected, but the output when turning the pedal is only 2 volts, and I am I right in thinking it isn't enough, as the pedal assist isn't working.

It could possibly be a duff pedal sensor ?

The throttle works fine, and it is a older Raleigh bike that I am getting rid of the torque sensor system as I can't get parts.

Thanks. Ian

You can't always measure it directly. Some need a pull-up resistor to switch properly. the pull-up resistor can be in the controller between the 5v and signal. if you disconnect the signal wire to measure it, you get a low result. If you measure it while connected to and powered by the controller, and it's only 2v, there's something wrong with it.

Also, just to be sure, you have to move the pedals very slowly when you measure so that you can see it switching on and off. with 5v. If you turn the pedals at normal speed, your voltmeter will give the average, which is about 2v.

Finally, check that it's not working when you pedal backwards with the new controller, which is quite common.

 

[betisbikes]

Thanks Saneagle. Turning the pedals slowly gives an even lower reading. I have tried turning it backwards and there is no output signal then.

I have checked the output from the controller and there is 5 volts

I have tried it disconnected from the controller, with a small plug in transformer giving 5 volts, which does not drop when turning the pedal.

The output is only 2 volts when turning the pedal fast and even lower when doing it slowly.

Thanks. Ian

 

[saneagle]

Thanks Saneagle. Turning the pedals slowly gives an even lower reading. I have tried turning it backwards and there is no output signal then.

I have checked the output from the controller and there is 5 volts

I have tried it disconnected from the controller, with a small plug in transformer giving 5 volts, which does not drop when turning the pedal.

The output is only 2 volts when turning the pedal fast and even lower when doing it slowly.

Thanks. Ian

I don't think you're doing it correctly. You set your voltmeter to DC, then you should see the voltage going on and off as each magnet passes, so 0v, 5v,0v 5v......

 

[betisbikes]

I am doing exactly what you are saying except I am getting 2 volts if I turn the pedal fast and less if I do it slowly.

So in answer to my question, you are saying that the output to the controller should be the full 5 volts ?

Thanks. Ian

 

[saneagle]

The controller should have 4.5v to 5v between the red and black wires. You still haven't confirmed whether you see the 2v going on and off with each magnet or whether it just stays on. Nor did you say what happens when you turn the pedals backwards.

 

[betisbikes]

I am sorry but you have really confused me now.

The wires are not red and black, but as I have a multi meter, I know which wires are 5 volt zero volts and the signal wire - the Chinese love changing wire colours depending on what wires they have on a particular day I think and they don't always put them in the same order, I have seen a white used as a positive and a red used for zero volts, so you can't be sure without testing as there do not seem to be any standards.

All I am asking is 5 volts going into the pedal sensor and 5 volts coming out when the magnet passes over it ?

Or is 2 volts okay or 1.5 volts ?

Or does the sensor take some of the voltage to drive it, so I will see a reduced output voltage and the controller would have a voltage range that would be acceptable for it to function ? Say 2 to 5 volts or something similar ?

Thanks. Ian