Hello.
I have a project in which I need to detect metallic objects (not magnetized). The distance from the sensor to the object will be about 5mm.
I am thinking of several systems, one would be using magnetic sensors from the Chinese, like those in the attached photo, another would be to build my own magnetic sensor, something similar to a metal detector with the PCB printed coil.
On the other hand, since I have to use hall sensors for other designs, in which I use neodymium magnets, it occurred to me if I could also use hall sensors to detect metallic objects. For example, by placing a small neodymium magnet between the hall sensor and the object to be detected, or the magnet near the sensor, so that by passing the metal object it alters the magnetic field of the magnet and is detected by the hall sensor.
I would prefer to use hall sensors, because it is simpler and cheaper than use magnetic sensors. I have seen some hall sensors that deliver an analog output that varies the voltage depending on the intensity of the detected magnetic field, these could help me.
Has anyone tried the use of hall sensors to detect non-magnetized metal objects?
Regards.