Hall effect sensor connection on a microquirt

[pw36889]

Hi all,

currently trying to use an hall effect sensor from bosch part number 0 261 210 148 on my distributor for rpm input. This part has tree connectors: a ground, a shield and a signal output. According to the literature for the hall effect, we need a 5 volt reference, ground and an output. Not sure how's this work with this sensor. In addition, on the microsquirt wiring diagram, only 2 wires connection are used: output to pin 30 and a ground to pin 31. Is this pin 30 assumes a signal from a 5 volts reference from the hall effect sensor? Is the ground at pin 31 the same ground of the sensor ground?

thanks for clarification.

Alain

[Matt Cramer]

The MicroSquirt Hall/optical input is a double ended input so it can be triggered in one of two ways:

- Apply constant voltage to pin 30 and a ground triggered input on pin 31

- Apply a constant ground to pin 31 and a voltage based trigger to pin 30

The sensor can use VREF (pin 28) for voltage and the main sensor ground for its ground.

[pw36889]

Thansk Matt for you response.

I am not sure that this sensor from Bosch is an hall effect and should be connected to pin 30 and 31. I believe that it is a VR type sensor and pin 32 and 33. Have a look at the datasheet and drawing from this site. Look at the sensor 0 261 210 136, it is the same as the one that I intent to use http://www.bosch-motorsport.com/content ... l/2874.htm

[pw36889]

Ok I will build a sensor myself for my custom made distributor. No choice, the machining was done for this Bosch sensor and wish to use hall effect. My mistake, bough the bad sensor. I will use the hall effect sensor 1302 from Allergo which produce an output to half of the imput. My input will the V ref at 5 volts, thus producing a 2.5 volts at the input to the microsquirt EC. The circuit had the pull resistance into it so no need to add this 1k resistance, I think. Is this enough of a signal? Also I will add a LED on the circuit to help me to align my home made distributor on the shake down of the car.

Any comments are welcome.

Thanks

Alain

[Matt Cramer]

That is a VR sensor in the link.

The optoisolated circuit needs at least 10 mA to trigger reliably. I'd use a 470 ohm pull-up instead of 1K.

[pw36889]

Just to be sure 470 ohms from my 5 volts vref?

thanks

[Matt Cramer]

That is correct.

[pw36889]

Change my mind about the 1302 Allegro sensor, after I spoke to Allegro, decided to go with an ATS627LSG sensor instead, they suggest to use a pull out of 1K ohms. Since I will use the 5 volts supply from the Microsquirt I have made a heat sink block from copper. Here's the pictures. Waiting for the new sensor from Digi-key to build the housing.

[pw36889]

here's the link for the pictures.

http://imageshack.us/photo/my-images/713/img5046pn.jpg/
http://imageshack.us/photo/my-images/710/img5049g.jpg/