Circuit Documentation

Summary

This circuit is designed to monitor soil moisture, water level, and temperature/humidity using various sensors. The data is processed by an Arduino UNO, which also controls a 5V relay. The circuit is powered by a 18650 Li-ion battery.

Component List

1. Capacitive Soil Moisture Sensor V1.2

   • Pins: GND, VCC, AOUT
   • Description: Measures soil moisture levels.
   • Purpose in Circuit: Provides analog output corresponding to soil moisture.

2. DHT22

   • Pins: +, Out, -
   • Description: Measures temperature and humidity.
   • Purpose in Circuit: Provides digital output for temperature and humidity data.

3. Water Level Sensor

   • Pins: SIG, VCC, GND
   • Description: Measures water level.
   • Purpose in Circuit: Provides analog output corresponding to water level.

4. Arduino UNO

   • 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
   • Description: Microcontroller board.
   • Purpose in Circuit: Central processing unit for the circuit.

5. 5V Relay

   • Pins: Normally Open, Common terminal, Normally Closed, In, GND, VCC
   • Description: Electromechanical switch.
   • Purpose in Circuit: Controls high-power devices.

6. 18650 Li-ion Battery

   • Pins: -, +
   • Description: Rechargeable battery.
   • Purpose in Circuit: Powers the circuit.

7. Resistor

   • Pins: pin1, pin2
   • Description: 200 Ohms resistor.
   • Purpose in Circuit: Current limiting.

Wiring Details

Capacitive Soil Moisture Sensor V1.2

• GND connected to Arduino UNO GND
• VCC connected to Arduino UNO 5V
• AOUT connected to Arduino UNO A0

DHT22

• - connected to Arduino UNO GND
• + connected to Resistor pin1
• Out connected to Arduino UNO D2
• Resistor pin2 connected to Arduino UNO 5V

Water Level Sensor

• GND connected to Arduino UNO GND
• VCC connected to Arduino UNO 5V
• SIG connected to Arduino UNO A1

Arduino UNO

• GND connected to 18650 Li-ion Battery -
• Vin connected to 18650 Li-ion Battery +
• D3 connected to 5V Relay In

5V Relay

• GND connected to Arduino UNO GND
• VCC connected to Arduino UNO 5V
• In connected to Arduino UNO D3

18650 Li-ion Battery

• - connected to Arduino UNO GND
• + connected to Arduino UNO Vin

Resistor

• pin1 connected to DHT22 +
• pin2 connected to Arduino UNO 5V

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 microcontroller.