The proximity switch circuit with integrated magnetic field sensor HMC1001

Published:2012/9/25 21:25:00 Author:Ecco | Keyword: proximity switch , integrated , magnetic field, sensor | From:SeekIC

As shown in figure, the proximity switch circuit is composed of HMC1001, operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator. When you move magnet with length being 6mm~12mm to HMC1001 in a predetermined position, the output voltage of MR bridge will reach 30mV, then the comparator flips, and output becomes a low level to light LED. If the magnet is removed, the comparator outputs high level to turn off LED. Obviously, the circuit is equivalent to the proximity switch of indicator light, and it can be used to detect displacement, rotate speed and other non-electricity. Adjusting R1 can set the threshold voltage of the switch.



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