Building this tester requires the use of an LCD. If this is your first time using an LCD, I suggest reading. For help adding the 16-pin male header to the LCD, see Figure 14-2 and Figure 14-3. The 10KΩ potentiometer’s center pin is wired to pin number 3 of the LCD. The potentiometer’s remaining pins should be wired to +5VDC and ground. Place the LCD onto the solderless breadboard, as shown in Figure 16-2. LCD pin numbers 1 and 2 are wired to ground and +5VDC, respectively. Adjust the 10KΩ potentiometer contrast control for the LCD for proper pixel-square visibility. For reference on how to do this, see Figure 14-4.
Complete the rest of the tester wiring using the Fritzing diagram shown in Figure 16-2.
Figure 16-2. Fritzing diagram for a Logic Tester with an LCD
TECH NOTE
Want to learn more about digital logic? Read Experiment 19 in Charles Platt’s Make: Electronics.
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