hi there i have a hall sonsor that i woud like to intergrate into one of my project
here is what i have: http://www.digikey.co.uk/product-detail/en/ATS682LSHTN-T/620-1327-1-ND/2042757
so what i'm trying to do is measure the wheel speed on a vehicle so im stuck to a max voltage around about 12v.
so far i have tried connecting +12v to pin 1 of the sensor and pin 4 to ground through 470ohm resistor which seems to work i get a variation between 6.06 - 9.48 volts on pin 4 of the sensor which also if i connect a 1mohm resistor i can get that down to 2.8 - 4.6 volts to go into the arduino.
i also had a play with running the sensor off a 5v supply and had no joy im presuming thats down to the minimum voltage rating of this sensor compared the the resistor size on the neutral leg. my concern is the 12v supply of the car isnt going to be very smooth so dont know if the sensor will handle some rubbish going down the line to it or do i need to do something to regulate it before?
also im presuming it might be safer to run an octocoupler inbetween the sensor and the arduino or something similar?
or am i completely barking up the wrong tree and does anybody have any better ways of going about this sensor.
any help will be appreciated thanks