3 Replies Latest reply on Jun 8, 2018 1:20 AM by bob.marlowe

    measurements with Hall Sensor SAR ADC

    harald.hermann_2860291

      Hey dear specialists,

      my project is defined as follow:

       

      requirements:

      1) Measure brushless rotor (north south pole´s gauss) and showing  +-value on LCD

      2) would be fine that LCD can offset to zero at the beginning

      3) platinum version --storage max values.....

       

      technical details

      Hall sensor ist feeded with 5V and deliver about 2,3V if there is no influens with magnetic field.

      with 1600 gauss magnet there is a range of 0.5V to 4.1V.

      the sensor give 1,3mVolt per gauss

       

      what happen until now

       

      Hall_PSOC_V4.PNG

      set LCD to zero is working with potentiometer, but if value goes under zero LCD show a positive value 65535 of a 16 bit code.

       

      My question so far:

      1) is there a nice hardware solution to fulfill my requirements, hence im too stupid for this 

       

      SAR decription on page 8 shows a lot of "single ended result formats", which I´m not able to match in my tons of versions on this project

       

      2) software solution

      - meaning-

      read start value of Hall sensor -storage it in a register or variable then subtract it from the measurement-

       

       

      very best regards and thanks in advance

      Harry

       

      sorry my electronics are 30 years ago and i never played with micro controller, but i HAVE  FUN with this small things, which are smarter than ME