I would really appreciate your help and suggestions with the following circuit.
My existing set-up is an allegro A1302 Ratiometric Linear Hall Effect Sensor simply powered via an LM7805 regulator with two 0.01 uF filter capacitors The output from the A1302 is fed to a BNC socket so that I can read magnetic field strength directly from my scope.
Datasheet http://www.allegromicro.com/~/media/Files/Datasheets/A1301-2-Datasheet.ashx
Existing circuit schematic attached
What I would like to do is modify my existing circuit by adding two LEDs to indicate magnetic polarity e.g. Red & Green indicating S or N
The quiescent voltage with no magnetic field is 2.5 Volt and I would like to switch either LED on at 150 millivolt or greater above and below that.
I want to switch the LEDs on fully, irrespective of the magnetic field strength , output voltage limits would be maximum 0V to 2.35V (North Pole) or 2.65 V to 5.0V (South Pole)
It would also be really useful if I could get a little beeper to beep every time the output changed. switching speed is quite slow - 0.5 seconds max.
My existing set-up is an allegro A1302 Ratiometric Linear Hall Effect Sensor simply powered via an LM7805 regulator with two 0.01 uF filter capacitors The output from the A1302 is fed to a BNC socket so that I can read magnetic field strength directly from my scope.
Datasheet http://www.allegromicro.com/~/media/Files/Datasheets/A1301-2-Datasheet.ashx
Existing circuit schematic attached
What I would like to do is modify my existing circuit by adding two LEDs to indicate magnetic polarity e.g. Red & Green indicating S or N
The quiescent voltage with no magnetic field is 2.5 Volt and I would like to switch either LED on at 150 millivolt or greater above and below that.
I want to switch the LEDs on fully, irrespective of the magnetic field strength , output voltage limits would be maximum 0V to 2.35V (North Pole) or 2.65 V to 5.0V (South Pole)
It would also be really useful if I could get a little beeper to beep every time the output changed. switching speed is quite slow - 0.5 seconds max.
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