24/2/2012 Week 4

Today, we checked and neaten the board again. In addition, we connected a LED to the output terminal, which can show result visually.

The modified board is shown as below, when someone enter the detection range (about 3m), the LED will go out immediately. 

At the same time, the oscilloscope displays square wave when someone moves in front of the sensor. We have test several times under different conditions, such as different distance, different person, and different movement speed. The amplitudes of the result are same approximately, which is shown as below,