Circuit Documentation

Summary

This circuit involves an Arduino Nano microcontroller interfacing with various sensors and actuators, including a sound sensor, soil moisture module, relay module, DC motor, and an LED. The circuit is powered by a 7.4V battery regulated by a 7805 voltage regulator to provide a stable 5V supply.

Component List

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

Sound Sensor

• Description: A sensor module that detects sound and outputs a corresponding signal.
• Pins: 5V +, OUT, GND

SparkFun gator:soil

• Description: A soil moisture sensor that measures the volumetric content of water in soil.
• Pins: VCC, GND, SIG

Soil Moisture Module

• Description: A module used to measure the moisture level in the soil.
• Pins: positive, negative, Analog, Digital, Ground, VCC

Relay Module 5V-30V

• Description: A relay module that can switch higher voltage and current loads.
• Pins: common contact, normally open, normally closed, trigger, V-, V+

DC Motor

• Description: A motor that runs on direct current (DC) electricity.
• Pins: pin 1, pin 2

7805 Voltage Regulator

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

7.4V Battery

• Description: A battery providing a 7.4V power supply.
• Pins: +, -

LED: Two Pin (red)

• Description: A red LED with two pins.
• Pins: cathode, anode

Wiring Details

Arduino Nano

• D2 connected to Sound Sensor OUT
• D4 connected to Relay Module trigger
• VIN connected to 7805 Vout, Relay Module V+, Sound Sensor 5V +, Soil Moisture Module VCC
• GND connected to 7805 Gnd, Relay Module V-, Sound Sensor GND, Soil Moisture Module Ground, DC Motor pin 2, LED cathode
• A5 connected to Soil Moisture Module Analog
• D13/SCK connected to LED anode

Sound Sensor

• OUT connected to Arduino Nano D2
• 5V + connected to 7805 Vout, Relay Module V+, Arduino Nano VIN, Soil Moisture Module VCC
• GND connected to 7805 Gnd, Relay Module V-, Arduino Nano GND, Soil Moisture Module Ground, DC Motor pin 2, LED cathode

SparkFun gator:soil

• VCC connected to Soil Moisture Module positive
• GND connected to Soil Moisture Module negative

Soil Moisture Module

• positive connected to SparkFun gator:soil VCC
• negative connected to SparkFun gator:soil GND
• Analog connected to Arduino Nano A5
• Ground connected to 7805 Gnd, Relay Module V-, Sound Sensor GND, Arduino Nano GND, DC Motor pin 2, LED cathode
• VCC connected to 7805 Vout, Relay Module V+, Sound Sensor 5V +, Arduino Nano VIN

Relay Module 5V-30V

• trigger connected to Arduino Nano D4
• normally open connected to Relay Module V+, 7805 Vout, Arduino Nano VIN, Sound Sensor 5V +, Soil Moisture Module VCC
• V- connected to 7805 Gnd, 7.4V -, Arduino Nano GND, Sound Sensor GND, Soil Moisture Module Ground, DC Motor pin 2, LED cathode
• common contact connected to DC Motor pin 1

DC Motor

• pin 1 connected to Relay Module common contact
• pin 2 connected to 7805 Gnd, Relay Module V-, Sound Sensor GND, Soil Moisture Module Ground, Arduino Nano GND, LED cathode

7805 Voltage Regulator

• Vin connected to 7.4V +
• Gnd connected to 7.4V -, Relay Module V-, Arduino Nano GND, Sound Sensor GND, Soil Moisture Module Ground, DC Motor pin 2, LED cathode
• Vout connected to Relay Module V+, Arduino Nano VIN, Sound Sensor 5V +, Soil Moisture Module VCC

7.4V Battery

• + connected to 7805 Vin
• - connected to 7805 Gnd, Relay Module V-, Arduino Nano GND, Sound Sensor GND, Soil Moisture Module Ground, DC Motor pin 2, LED cathode

LED: Two Pin (red)

• cathode connected to 7805 Gnd, Relay Module V-, Sound Sensor GND, Soil Moisture Module Ground, Arduino Nano GND, DC Motor pin 2
• anode connected to Arduino Nano D13/SCK

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)