Circuit Documentation

Summary

This circuit involves an Arduino UNO microcontroller interfacing with multiple components including resistors, photocells (LDRs), micro servos, a solar panel, a Li-ion battery, a rocker switch, and an LED. The circuit is designed to read light levels using photocells, control servos, and manage power using a solar panel and battery.

Component List

1. Arduino UNO

   • Description: Microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. Resistor

   • Description: 200 Ohms resistor.
   • Pins: pin1, pin2

3. Photocell (LDR)

   • Description: Light-dependent resistor.
   • Pins: pin 0, pin 1

4. Micro servo 9G

   • Description: Small servo motor.
   • Pins: GND, +5V, PWM

5. Qwiic Cable - Breadboard Jumper (4-pin)

   • Description: 4-pin jumper cable.
   • Pins: GND, 3.3V, SDA, SCL

6. Solar panel

   • Description: Solar panel for power generation.
   • Pins: +, -

7. Li-ion battery 18650-2000mAh 3.7V 7.4WH

   • Description: Rechargeable lithium-ion battery.
   • Pins: +, -

8. Rocker Switch

   • Description: On/Off switch.
   • Pins: 1, 2

9. LED: Two Pin (green)

   • Description: Green LED.
   • Pins: cathode, anode

Wiring Details

Arduino UNO

• 5V is connected to:

  • pin 0 of all Photocells (LDRs)
  • +5V of both Micro servos
  • 3.3V of both Qwiic Cables

• GND is connected to:

  • pin2 of all Resistors
  • GND of both Micro servos
  • GND of both Qwiic Cables

• A0 is connected to:

  • pin1 of a Resistor
  • pin 1 of a Photocell (LDR)

• A1 is connected to:

  • pin1 of a Resistor
  • pin 1 of a Photocell (LDR)

• A2 is connected to:

  • pin1 of a Resistor
  • pin 1 of a Photocell (LDR)

• A3 is connected to:

  • pin1 of a Resistor
  • pin 1 of a Photocell (LDR)

• D9 is connected to:

  • SCL of a Qwiic Cable
  • PWM of a Micro servo

• D8 is connected to:

  • SCL of a Qwiic Cable
  • PWM of a Micro servo

Resistors

• pin1 of each Resistor is connected to:

  • pin 1 of a Photocell (LDR)
  • A0, A1, A2, or A3 of the Arduino UNO

• pin2 of each Resistor is connected to:

  • GND of the Arduino UNO
  • GND of a Qwiic Cable

Photocells (LDRs)

• pin 0 of each Photocell is connected to:

  • 5V of the Arduino UNO

• pin 1 of each Photocell is connected to:

  • pin1 of a Resistor
  • A0, A1, A2, or A3 of the Arduino UNO

Micro servos

• GND of each Micro servo is connected to:

  • GND of the Arduino UNO

• +5V of each Micro servo is connected to:

  • 5V of the Arduino UNO

• PWM of each Micro servo is connected to:

  • D9 or D8 of the Arduino UNO

Qwiic Cables

• GND of each Qwiic Cable is connected to:

  • GND of the Arduino UNO

• 3.3V of each Qwiic Cable is connected to:

  • 5V of the Arduino UNO

• SCL of each Qwiic Cable is connected to:

  • D9 or D8 of the Arduino UNO

Solar panel

• + is connected to:

  • pin 1 of the Rocker Switch
  • • of the Li-ion battery

• - is connected to:

  • cathode of the LED
  • • of the Li-ion battery

Li-ion battery

• + is connected to:

  • pin 1 of the Rocker Switch
  • • of the Solar panel

• - is connected to:

  • cathode of the LED
  • • of the Solar panel

Rocker Switch

• pin 1 is connected to:

  • • of the Solar panel
  • • of the Li-ion battery

• pin 2 is connected to:

  • anode of the LED

LED: Two Pin (green)

• cathode is connected to:

  • • of the Solar panel
  • • of the Li-ion battery

• anode is connected to:

  • pin 2 of the Rocker Switch

Documented Code

Arduino UNO Code

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

This code is a basic template for the Arduino UNO. The setup() function is where you initialize your components, and the loop() function is where you place the main code that runs repeatedly.