Hello people! I am doing a project , where a part of it consists in a metal detector. The terminals of the coil is usually with a sinusoidal signal of 1.4 V peak to peak, and when it feel the presence of metal, the sinusoidal signal drops to 1.26 V peak to peak or even less (if the metal is greater). What do I need to do is how can I compare the sinusoidal signals? To further send to a microprocessor and it indicates on the LCD.
Basically the process is this: If sinusoidal signal => 1.4 Vpp ==> LCD -> "None detected" if sinusoidal signal <= 1.26 Vpp ==> LCD-> "Metal detected."
I had to study using a comparator with hysteresis 741 opamp, but the theoretical values are very different from real, or else I'm doing some bad connections, I believe that this is basic, anyone can teach me how do I make a simple circuit to make this comparison ?
Thank you for your help,
Chaud
Basically the process is this: If sinusoidal signal => 1.4 Vpp ==> LCD -> "None detected" if sinusoidal signal <= 1.26 Vpp ==> LCD-> "Metal detected."
I had to study using a comparator with hysteresis 741 opamp, but the theoretical values are very different from real, or else I'm doing some bad connections, I believe that this is basic, anyone can teach me how do I make a simple circuit to make this comparison ?
Thank you for your help,
Chaud