Example 14-1 displays a variety of characters, letters, and numbers based on C language programming instructions. The sketch is programmed to test all segments of the LCD as it cycles through the Arduino program. The Arduino sketch uses digital data pins D2, D3, D4, D5, D11, and D12 of its microcontroller chip to send text message information to the LCD. Time delays programmed into the sketch allow the characters, letters, and numbers to be displayed continuously on the LCD. The 10K potentiometer lets you adjust the contrast of the display.
The block diagram in Figure 14-7 shows the building blocks and the electrical signal flow for the LCD News Reader. Circuit schematic diagrams are used by electrical engineers to quickly build cool electronic devices. The equivalent circuit schematic diagram for the LCD News Reader is shown in Figure 14-8.
Figure 14-7. The LCD News Reader block diagram
Figure 14-8. The LCD News Reader circuit schematic diagram
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