Parts List

• Arduino microcontroller
• MakerShield kit
• R1: 330 ohm resistor (orange, orange, brown stripes)
• R2: 330 ohm resistor (orange, orange, brown stripes)
• R3: 10K ohm potentiometer
• R4: photocell
• R5: 1K ohm resistor (brown, black, red stripes)

Figure 4-1. Variety of LEDs

Figure 4-2. Twin LEDs block diagram