Hello all. Thanks for taking up your time to read my post.
I have an Arduino based circuit that performs a mechanical job and I’d like the circuit to turn on when it detects a magnetic field for HMR3400 as the datasheet of http://www.kynix.com/uploadfiles/pdf8827/HMR3400.pdf . I want to use a magnet as a trigger for the circuit. When a magnet is attached to something like say a stick and put near the circuit board I’d like it to detect the magnetic field and turn on.
I have learnt that an operational amplifier can be used for this purpose but need guidance on how to do it as I am a novice in embedded systems & electronics.
Can anyone help me ? I am very puzzled about this question. I do need your help.
thanks in advance.