Make: Basic Arduino Projects by Don Wilcher
Author:Don Wilcher
Language: eng
Format: epub, azw3, pdf
ISBN: 9781449360665
Publisher: Maker Media, Inc.
Published: 2014-03-15T00:00:00+00:00
Figure 16-3. The Logic Tester testing the Arduino’s +5V source
Tech Note
An electrical tester used to check digital circuits is called a logic probe.
Circuit Theory
Pressing the pushbutton will close the switch and allow +5 volts DC electrical current to flow through the circuit. The Arduino reads digital pin 6 to determine if the pin is receiving +5 volts (i.e., set to HIGH), or if it is not receiving any voltage (i.e., set to LOW). The Arduino takes that information and sends it to the LCD display via digital pins D2, D3, D4, D5, D11, and D12. The LCD then displays “HIGH (1)” or “LOW (0)” depending on the state of digital pin 6.
The block diagram in Figure 16-4 shows the electronic component blocks and the electrical signal flow for the Logic Tester. A Fritzing electronic circuit schematic diagram of the tester is shown in Figure 16-5. Electronic circuit schematic diagrams are used by electrical/electronic engineers to design and build cool electronic products for society.
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