Actually im using a pnp type of metal sensor, so that whenever the sensor senses a metal object,a digital timer circuit connected to it starts running.
But what i want is that, the digital timer should be started whenever the sensor is not sensing.even i connected a npn type of metal sensor to achieve the above,but im not successful.......
is there any other sensor/method to solve the above problem????
But what i want is that, the digital timer should be started whenever the sensor is not sensing.even i connected a npn type of metal sensor to achieve the above,but im not successful.......
is there any other sensor/method to solve the above problem????