Troubleshooting Circuit

After we completely done all the hardware of the Body Detector circuit, we found that the project did not function well as what we expect the result. Even though the circuit connection seem right from outside view but we cannot find the real problem which part that did not work proper since the circuit already completely done constructing and soldering. It is hard to troubleshoot the circuit that already completely done because at this stage the circuit already combine with other parts, so that any error or signal that occur in the frequency will be quiet difficult to detect. 

Therefore, it is better if we construct the circuit first on the breadboard before directly construct it on the PCB board. The reason why it is necessary to constructing the circuit on the breadboard first because by using breadboard, we can directly check it part by part using multimeter or other tools. However if we already construct it on PCB board with complete soldering it, then it be difficult for us. First we need to suck the solder ion first, then we need to take it off one by one to check each part of the circuit. That is why we have to do the proper preliminary test and calibration before completely the complete circuit. 

For this circuit, the possible reason why it did not fully function may be because of the DIP switch that we changed. Even though supposedly the real function is once the metal sensor sense any metal approaching it, it will automatically switch On the buzzer to trigger and at the same time the red l.e.d also will turn On. However, the real function just partly operate not like what we expected for the result. We make the troubleshooting lab level 2 with the guide of the technician Abg Shahrul, however we cannot find the real problem either. So that, we just assuming that the result as partly operate only.