Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with various sensors and actuators, including two Tower Pro SG90 servos, a photocell (LDR), a rain sensor, and a 7805 voltage regulator. The circuit is powered by a 18650 Li-Ion battery and includes a rocker switch for power control. The Arduino Nano reads data from the sensors and controls the servos based on the sensor inputs.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. Tower Pro SG90 servo

   • Description: A micro servo motor used for precise control of angular position.
   • Pins: Signal, +5V, GND

3. Photocell (LDR)

   • Description: A light-dependent resistor that changes its resistance based on the light intensity.
   • Pins: pin 0, pin 1

4. Resistor

   • Description: A 10k Ohm resistor used to limit current.
   • Pins: pin1, pin2
   • Properties: Resistance: 10k Ohms

5. 7805

   • Description: A voltage regulator that outputs a stable 5V.
   • Pins: Vin, Gnd, Vout

6. RAIN SENSOR

   • Description: A sensor used to detect the presence of rain.
   • Pins: AO, DO, GRD, VCC

7. 18650 Li-Ion

   • Description: A rechargeable lithium-ion battery.
   • Pins: Positive, Negative

8. Rocker Switch

   • Description: A switch used to control the power supply.
   • Pins: 1, 2

Wiring Details

Arduino Nano

• GND connected to:

  • 7805 (Gnd)
  • 18650 Li-Ion (Negative)
  • RAIN SENSOR (GRD)
  • Tower Pro SG90 servo (GND)
  • Resistor (pin2)
  • Tower Pro SG90 servo (GND)

• D9 connected to:

  • Tower Pro SG90 servo (Signal)

• D10 connected to:

  • Tower Pro SG90 servo (Signal)

• VIN connected to:

  • 7805 (Vin)
  • Rocker Switch (2)

• 5V connected to:

  • Photocell (LDR) (pin 0)

• A1 connected to:

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

• A0 connected to:

  • RAIN SENSOR (AO)

Tower Pro SG90 servo

• Signal connected to:

  • Arduino Nano (D9)
  • Arduino Nano (D10)

• +5V connected to:

  • 7805 (Vout)

• GND connected to:

  • Arduino Nano (GND)

Photocell (LDR)

• pin 0 connected to:

  • Arduino Nano (5V)

• pin 1 connected to:

  • Resistor (pin1)
  • Arduino Nano (A1)

Resistor

• pin1 connected to:

  • Photocell (LDR) (pin 1)
  • Arduino Nano (A1)

• pin2 connected to:

  • Arduino Nano (GND)

7805

• Gnd connected to:

  • Arduino Nano (GND)
  • 18650 Li-Ion (Negative)

• Vin connected to:

  • Rocker Switch (2)
  • Arduino Nano (VIN)

• Vout connected to:

  • RAIN SENSOR (VCC)
  • Tower Pro SG90 servo (+5V)

RAIN SENSOR

• GRD connected to:

  • Arduino Nano (GND)

• AO connected to:

  • Arduino Nano (A0)

• VCC connected to:

  • 7805 (Vout)

18650 Li-Ion

• Positive connected to:

  • Rocker Switch (1)

• Negative connected to:

  • 7805 (Gnd)
  • Arduino Nano (GND)

Rocker Switch

• 1 connected to:

  • 18650 Li-Ion (Positive)

• 2 connected to:

  • 7805 (Vin)
  • Arduino Nano (VIN)

Documented Code

Arduino Nano Code (sketch.ino)

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

}

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

}

Additional Documentation (documentation.txt)