Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed using an Arduino UNO microcontroller. The circuit includes various sensors, an LCD display, a Bluetooth module, an LED, a relay, and a water pump. The purpose of this circuit is to monitor environmental conditions such as soil moisture, humidity, temperature, and rain, and to control a water pump based on these conditions. The data can be displayed on an LCD and transmitted via Bluetooth.

Component List

1. Arduino UNO

   • Description: A 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. DHT11 Humidity and Temperature Sensor

   • Description: A sensor for measuring humidity and temperature.
   • Pins: VDD, DATA, NULL, GND

3. SparkFun Soil Moisture Sensor

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

4. RAIN SENSOR

   • Description: A sensor for detecting rain.
   • Pins: AO, DO, GRD, VCC

5. LED: Two Pin (red)

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

6. 16x2 I2C LCD

   • Description: A 16x2 character LCD with I2C interface.
   • Pins: GND, VCC, SDA, SCL

7. HC-05 Bluetooth Module

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

8. Water Pump

   • Description: A small water pump.
   • Pins: positive, negative

9. 9V Battery

   • Description: A 9V battery for power supply.
   • Pins: +, -

10. 1 Channel Relay 5V

    • Description: A relay module for controlling high voltage devices.
    • Pins: VCC, GND, IN, NC, COM, NO

Wiring Details

Arduino UNO

• GND connected to:

  • SparkFun Soil Moisture Sensor (GND)
  • RAIN SENSOR (GRD)
  • LED: Two Pin (red) (cathode)
  • 16x2 I2C LCD (GND)
  • DHT11 Humidity and Temperature Sensor (GND)
  • 1 Channel Relay 5V (GND)
  • HC-05 Bluetooth Module (GND)

• 5V connected to:

  • SparkFun Soil Moisture Sensor (VCC)
  • RAIN SENSOR (VCC)
  • 16x2 I2C LCD (VCC)
  • DHT11 Humidity and Temperature Sensor (VDD)
  • 1 Channel Relay 5V (VCC)
  • HC-05 Bluetooth Module (VCC)

• D2 connected to:

  • DHT11 Humidity and Temperature Sensor (DATA)

• A0 connected to:

  • SparkFun Soil Moisture Sensor (SIG)

• A3 connected to:

  • RAIN SENSOR (AO)

• A4 connected to:

  • 16x2 I2C LCD (SDA)

• A5 connected to:

  • 16x2 I2C LCD (SCL)

• D11 connected to:

  • HC-05 Bluetooth Module (RXD)

• D10 connected to:

  • HC-05 Bluetooth Module (TXD)

• D8 connected to:

  • 1 Channel Relay 5V (IN)

• D4 connected to:

  • LED: Two Pin (red) (anode)

SparkFun Soil Moisture Sensor

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• SIG connected to:

  • Arduino UNO (A0)

RAIN SENSOR

• GRD connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• AO connected to:

  • Arduino UNO (A3)

LED: Two Pin (red)

• cathode connected to:

  • Arduino UNO (GND)

• anode connected to:

  • Arduino UNO (D4)

16x2 I2C LCD

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• SDA connected to:

  • Arduino UNO (A4)

• SCL connected to:

  • Arduino UNO (A5)

HC-05 Bluetooth Module

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• RXD connected to:

  • Arduino UNO (D11)

• TXD connected to:

  • Arduino UNO (D10)

Water Pump

• positive connected to:

  • 1 Channel Relay 5V (NC)

• negative connected to:

  • 9V Battery (-)

9V Battery

• + connected to:

  • 1 Channel Relay 5V (COM)

• - connected to:

  • Water Pump (negative)

1 Channel Relay 5V

• GND connected to:

  • Arduino UNO (GND)

• VCC connected to:

  • Arduino UNO (5V)

• IN connected to:

  • Arduino UNO (D8)

• NC connected to:

  • Water Pump (positive)

• COM connected to:

  • 9V Battery (+)

Documented Code

Arduino UNO Code (sketch.ino)

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

}

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

}

Documentation (documentation.txt)

This document provides a comprehensive overview of the circuit, including the components used, their wiring details, and the code for the Arduino UNO microcontroller.