Today we continued to check the circuit, a LED lamp was inserted into the circuit instead of oscilloscope to test the output. However, once the supply voltage was connected, the LED lamp changed to light and remained lighting. As a result, we thought there was mistakes in the circuit structure. On the one hand, we decided to re-build and embellish the circuit. On the other hand, we decided to divide the circuit into three parts and check them one by one.
After re-building the circuit, we tested the primary part and observed tiny pulse on the oscilloscope when hands passed in front of the PIR sensor, which proves that the primary part can work effectively (The time option is adjusted to 0.2s). However, when we tested the second part of the circuit, the waveform has no response and remained a straight line. We have checked the circuit for several times, but we cannot find the reason.
Then we decided to build the other circuit board to find if there will be some different. However, the fist part of the second board did not work as expected, so we had to check it again to find the problem.
After doing the experiment today, we decide to test the original output of the PIR sensor to find the amplification of the primary part of the circuit. Moreover, we will write part of the report tomorrow.
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