CHAPTER 9
Person Counter
This project uses an ultrasonic range finder and an LED display module to count people moving past the range finder and display the number (Figure 9-1).
FIGURE 9-1 Person counter.
Parts
This project uses a Protoshield and an RGB LED to indicate status and a power MOSFET transistor to switch the 12 V needed by the door latch.
To build this project, you will need the following:
Protoshield Layout
Figure 9-2 shows the ...
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