Say like automotive relays
True.Use an hall effect sensor.
Thanks Tom. There are some cool apps ( and installed some) but no luck for what I want.check to see if one of your phone apps can do it.
on android, there is smart tools (multifunction application)
Great! Thanks ebeowulf17 you put me in a good position to start experimenting. I will check this out and comment later on. Thanks again!Here's a version of my circuit with the unnecessary bits trimmed out. This one was for external 5VDC power supply, so I'm not entirely sure what it would take to adapt it to battery power.
[EDIT:] U1 isn't properly called out in the drawing, but it's a Honeywell SS495A.
View attachment 77493
My phone does'nt take this app, but I do have a compass, I will try with it. Good point. Thanks Alec t.Do you have a compass app? That will detect nearby magnetic fields.
If you use my circuit with the linear, proportional SS495A, the sensor will only do a good job detecting your magnetic field in one orientation, with the face of the sensor perpendicular to the field lines, either face up or face down depending on whether it reads positive or negative gauss....you need to watch the part number as there are unipolar, bipolar and latch.
Max.
by Duane Benson
by Don Wilcher
by Aaron Carman
by Jake Hertz