Circuit Documentation

Summary

This circuit is designed to interface various sensors and modules with an Arduino Mega 2560 microcontroller. The components include a DHT11 temperature and humidity sensor, an MQ-2 gas sensor, an HC-05 Bluetooth module, a 5V relay, a water pump, a 12V battery, a rain/snow sensor, a soil moisture sensor, and a soil moisture interceptor. The Arduino Mega 2560 serves as the central controller, reading data from the sensors and controlling the relay and water pump.

Component List

1. Arduino Mega 2560

   • Description: A microcontroller board based on the ATmega2560.
   • Pins: IOREF, RESET, 3V3, 5V, GND, VIN, A0-A15, D0-D53, AREF, SDA, SCL

2. DHT11

   • Description: A temperature and humidity sensor.
   • Pins: DATA, GND, VCC

3. MQ-2

   • Description: A gas sensor for detecting LPG, i-butane, propane, methane, alcohol, hydrogen, and smoke.
   • Pins: GND, VCC, ANALOG, Digital

4. HC-05 Bluetooth Module

   • Description: A Bluetooth module for wireless communication.
   • Pins: Key, VCC, GND, TXD, RXD, State

5. 5V Relay

   • Description: A relay module for switching high voltage devices.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

6. Water Pump

   • Description: A pump for moving water.
   • Pins: VCC, GND

7. Battery 12V

   • Description: A 12V battery for powering the water pump.
   • Pins: +, -

8. Rain/Snow Sensor - Board

   • Description: A sensor board for detecting rain or snow.
   • Pins: 1, 2, A0 (Analog), D0 (Digital), GND, VCC (5V)

9. YL-83 Rain Sensor - Detection Board

   • Description: A detection board for the rain sensor.
   • Pins: POS, NEG

10. SparkFun Soil Moisture Sensor

    • Description: A sensor for measuring soil moisture.
    • Pins: VCC, GND, SIG

11. Soil Moisture Interceptor

    • Description: A module for interfacing with the soil moisture sensor.
    • Pins: AO, DO, GND, VCC

Wiring Details

Arduino Mega 2560

• 5V: Connected to VCC (5V) of Rain/Snow Sensor - Board, VCC of DHT11, VCC of Soil Moisture Interceptor, VCC of MQ-2, VCC of HC-05 Bluetooth Module, VCC of 5V Relay
• GND: Connected to GND of Rain/Snow Sensor - Board, GND of DHT11, GND of MQ-2, GND of HC-05 Bluetooth Module, GND of Soil Moisture Interceptor, GND of 5V Relay
• D2 PWM: Connected to DATA of DHT11
• D3 PWM: Connected to Digital of MQ-2
• D4 PWM: Connected to DO of Soil Moisture Interceptor
• D5 PWM: Connected to D0 (Digital) of Rain/Snow Sensor - Board
• D6 PWM: Connected to In of 5V Relay
• D10 PWM: Connected to TXD of HC-05 Bluetooth Module
• D11 PWM: Connected to RXD of HC-05 Bluetooth Module

DHT11

• DATA: Connected to D2 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• VCC: Connected to 5V of Arduino Mega 2560

MQ-2

• Digital: Connected to D3 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• VCC: Connected to 5V of Arduino Mega 2560

HC-05 Bluetooth Module

• TXD: Connected to D10 PWM of Arduino Mega 2560
• RXD: Connected to D11 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• VCC: Connected to 5V of Arduino Mega 2560

5V Relay

• In: Connected to D6 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• VCC: Connected to 5V of Arduino Mega 2560
• Common terminal: Connected to + of Battery 12V
• Normally Closed: Connected to VCC of Water Pump

Water Pump

• VCC: Connected to Normally Closed of 5V Relay
• GND: Connected to - of Battery 12V

Battery 12V

• +: Connected to Common terminal of 5V Relay
• -: Connected to GND of Water Pump

Rain/Snow Sensor - Board

• VCC (5V): Connected to 5V of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• D0 (Digital): Connected to D5 PWM of Arduino Mega 2560
• 1: Connected to POS of YL-83 Rain Sensor - Detection Board
• 2: Connected to NEG of YL-83 Rain Sensor - Detection Board

YL-83 Rain Sensor - Detection Board

• POS: Connected to 1 of Rain/Snow Sensor - Board
• NEG: Connected to 2 of Rain/Snow Sensor - Board

SparkFun Soil Moisture Sensor

• VCC: Connected to VCC of Soil Moisture Interceptor
• GND: Connected to GND of Soil Moisture Interceptor

Soil Moisture Interceptor

• DO: Connected to D4 PWM of Arduino Mega 2560
• GND: Connected to GND of Arduino Mega 2560
• VCC: Connected to 5V of Arduino Mega 2560

Documented Code

sketch.ino

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

}

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

}

documentation.txt