Omega’s new series of 2-wire DC inductive proximity sensors has a sensing distance range of 2 to 20 mm (0.08 to .79"). It comes in shielded and unshielded models with short barrel or standard lengths.

Now that we have discussed the theory about the sigma-delta modulator, let us design a simple proximity sensor that will detect an approaching hand and switch on an LED. A 0.5 mm 2 wire, 10 cm long, ...