Parts List

• Arduino microcontroller
• MakerShield kit
• S1: pushbutton switch
• S2: pushbutton switch
• R1: 1KΩ resistor (brown, black, red stripes)
• R1: 330Ω resistor (orange, orange, brown stripes) for basic OR Logic Gate circuit
• R2: photocell
• R3: 1KΩ resistor (brown, black, red stripes)
• R4: 330Ω resistor (orange, orange, brown stripes) for Arduino OR Logic Gate
• LED1: red LED for basic OR Logic Gate Circuit (green LED for Arduino OR Logic Gate)

Figure 7-1. The assembled Arduino OR Logic Gate

TECH NOTE

When two or more electrical/electronic components are connected across one voltage source via separate paths, this is called a parallel circuit. In a parallel circuit, there are different ways that electricity can flow.