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Speed sensor voltage
Posted: Fri Jun 27, 2014 1:34 am
by Danga81
Can anyone please tell me if the voltage that goes to the speed sensor input in an 808 ecu has to be 5 volts or can it handle 12 volts? I have an acewell reed switch I would like to use as a speed sensor which sends a 12 volt square wave compared to a Hall effect which I believe all have an output of 5 volts
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 6:35 am
by kojab
The 808 has 12V on A10 so your 12 volt square wave will work as long as it is pulled to ground as the vehicle moves.
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 10:35 am
by Danga81
So your saying a10 has a constant voltage on it?
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 11:29 am
by VL400
A10 has 12V ignition via a pullup resistor, it varies with battery volts but that does not matter. So like kojab said, if your switch pulls to ground you get a 12V square wave which is fine - the factory speed sensor gives a 12V square wave on A10.
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 11:34 am
by kojab
Danga81 wrote:So your saying a10 has a constant voltage on it?
Yes it has a constant 12V voltage on it but only when is is not being pulled to ground by the speed sensor.
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 11:38 am
by kojab
VL beat me to it.
Re: Speed sensor voltage
Posted: Fri Jun 27, 2014 12:36 pm
by Danga81
Thanks guys just what I needed to know, and quick with the replys