Inductive anti-theft alarm circuit using TWH9248 module
Source: InternetPublisher:赔钱虎 Keywords: Inductive anti-theft alarm circuit BSP antenna Updated: 2021/05/21
It is actually a human body sensor switch, which can be used for anti-theft alarms, automatic
hand washers, hand dryers, showers, etc. It uses the TWH9248 radar detection module Ai (which emits
microwave signals with a frequency of about 1000MHz). And the TWH9249 module Az is used for power amplification to drive the relay KA
to work.
The antenna can be a whip antenna , and the inductance L can be +0.6mm high-strength enameled wire wound around a 5mm magnetic rod for several turns.
Its detection distance can reach 10m. Adjust the potentiometer RP to change the sensitivity of the device.
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