The Logic Tester is an easy-to-build Arduino microcontroller device. The RGB has three individual color LEDs that allow binary data to be seen visually. The RGB LED pinout is shown in Figure 15-2. Only the red and green LEDs will be used to show the binary logic values of “0” and “1”. To ensure proper operation of the RGB LED, the flat side of the LED should be facing the Test pushbutton switch. See Figure 15-2 for the proper orientation of the RGB LED. Some LEDS may have the blue and green leads swapped. If yours is like that, you may need to move the G wire to the pin labeled B.
TECH NOTE
Base 2 is the number format for binary data.
Figure 15-2. Fritzing diagram for a logic tester with an RGB LED
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