Last week, we drew the circuit simulation layout which is based on a voltage comparator (LM393). This week, we began to connect the circuit on the breadboard. As can be seen on the following figure, we added a LED in the circuit. When the LED turns on, it indicates there is a high output and one person has entered the door. At first, we did not connect the IR transmitter and receiver in the circuit. In consequence, we adjusted the magnitude of resistor ourselves to achieve the high and low output voltage. We also loaded the program in the ARM, so that the screen could show the current number of the people on the LCD when the output voltage is high.
Then we started to connect the IR transmitter and receiver circuit. The simulation layout looks simple, however, we failed in this part. The IR receiver was not capable of receiving the signal transmitted by the IR transmitter. We tried many times but the result was the same. The reason we finally figured out was that the signal power was low. There are two methods to solve this problem. The first one is to change a higher power transmitter. Another way is to add an amplifier in the circuit. We chose the second solution and began to design the amplifying circuit this week.
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