3/2/2012 Week 1

Today, we have built the circuit according to the design circuit. In the design circuit, two 1.2M resistors are required. However, there are no exact ones in the laboratory, so we choose two resistors 1M and 220k in series instead.

This is the original circuit without embellishment, so the wires seem not neat. Though we connected the circuit, the output wave does not display as expected. When hands passed in front of the PIR sensor, the waveform remained a straight line. We have checked the circuit but cannot find the reason. Next time, we will check the whole circuit in part to find the reason.