Hall effect sensor voltage

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
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rs2000
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Hall effect sensor voltage

Post by rs2000 »

Does anyone know if a bosch hall effect sensor, as found on a ford sierra, is a 12v or 5v sensor? It has ..232 written on the top and that is the only visable marking without taking the distributor apart

thanks
andrew
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rs2000
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Post by rs2000 »

To answer my own question its a 12V
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efahl
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Post by efahl »

That's been my experience with VW/Audi Bosch Hall sensors, too, every one I've checked is 12v (either by direct measurement from the sensor or by chasing the circuit diagrams to the supply).

Eric
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corsa_A
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Post by corsa_A »

rs2000 wrote:To answer my own question its a 12V
Yes all of my Bosch hall sensors from Vauxhall/Opel cars also have 12V suply voltage. I must mention that wiring the sensor backwards cause them to fried. I learned that hard way :oops:
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rs2000
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Post by rs2000 »

I've been told by someone else its a 5V sensor.. its no trouble to use 5V, should i just go for that? If i do use 5V then i still use 12V on my pullup resistor right? Or should i just use 12V and hope its ok, everyone here seems to think bosch sensors are 12V?
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newtyres

Post by newtyres »

The sensor probably requires a 12V supply, but probably outputs a 0V or 5V signal (to feed a 5V processor), so to be safe it might be best to first try a pullup resistor to 5V rather than 12V. I'm guessing here but I was playing with an optical cam sensor today that works as stated above.
Ian.
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FWarner
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Post by FWarner »

The hall effect sensors (I prefer switch) used on bmw motorcycles for a bosch EFI system are supplied by siemens.

They have a supply rating from something like 5 volts to over 17 volt. So they can be operated off any voltage in that range!

The output is open collector, a maximum voltage would be over 20 volts, and the maximum current is 20 milliamps. Meaning the output is lick a switch or points, but it can only withstand an open circuit voltage of 20 volts and when it is short circuit a maximum current of 20 milliamps.

More info from a different manufacture (but physically and electrically compatible) available from Honeywell; part No 2AV54 Search on www.honeywell.com/sensing/
Frank Warner
Sydney Australia
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