Circuit Documentation

Summary

This circuit is designed to monitor soil moisture levels and control a relay based on the moisture readings. It uses an Arduino UNO microcontroller to read data from a soil moisture sensor and display the readings on an LCD screen. Additionally, a relay is used to control a buzzer, which can be activated based on the moisture levels.

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. 5V Relay

   • Description: A relay module that operates at 5V.
   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC

3. SparkFun Soil Moisture Sensor

   • Description: A sensor to measure the moisture content in the soil.
   • Pins: VCC, GND, SIG

4. Soil Moisture Module

   • Description: A module to interface with the soil moisture sensor.
   • Pins: positive, negative, Analog, Digital, Ground, VCC

5. LCD Screen 16x2 I2C

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

6. 5V Battery

   • Description: A 5V power source.
   • Pins: +, -

7. Buzzer

   • Description: A simple buzzer for audio alerts.
   • Pins: PIN, GND

Wiring Details

Arduino UNO

• A0: Connected to Soil Moisture Module (Analog)
• A4: Connected to LCD Screen 16x2 I2C (SDA)
• A5: Connected to LCD Screen 16x2 I2C (SCL)
• D2: Connected to 5V Relay (In)

5V Relay

• In: Connected to Arduino UNO (D2)
• Normally Open: Connected to 5V Relay (VCC), Soil Moisture Module (VCC), LCD Screen 16x2 I2C (VCC), 5V Battery (+)
• Common terminal: Connected to Buzzer (PIN)
• GND: Connected to Soil Moisture Module (Ground), LCD Screen 16x2 I2C (GND), Buzzer (GND), 5V Battery (-)

SparkFun Soil Moisture Sensor

• VCC: Connected to Soil Moisture Module (positive)
• GND: Connected to Soil Moisture Module (negative)

Soil Moisture Module

• Analog: Connected to Arduino UNO (A0)
• positive: Connected to SparkFun Soil Moisture Sensor (VCC)
• negative: Connected to SparkFun Soil Moisture Sensor (GND)
• Ground: Connected to 5V Relay (GND)
• VCC: Connected to 5V Relay (Normally Open)

LCD Screen 16x2 I2C

• SDA: Connected to Arduino UNO (A4)
• SCL: Connected to Arduino UNO (A5)
• VCC: Connected to 5V Relay (Normally Open)
• GND: Connected to 5V Relay (GND)

5V Battery

• +: Connected to 5V Relay (Normally Open)
• -: Connected to 5V Relay (GND)

Buzzer

• PIN: Connected to 5V Relay (Common terminal)
• GND: Connected to 5V Relay (GND)

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:

}

Additional Documentation (documentation.txt)

This documentation provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and the code used in the Arduino UNO microcontroller.