Circuit Documentation

Summary

This circuit is designed to measure soil moisture levels using a soil moisture sensor and an ESP8266 microcontroller. The circuit is powered by a 9V battery and includes a rocker switch to control the power supply. The ESP8266 reads the analog value from the soil moisture sensor and prints the value to the Serial Monitor.

Component List

1. 9V Battery

   • Description: Provides power to the circuit.
   • Pins: +, -

2. Rocker Switch

   • Description: Controls the power supply to the circuit.
   • Pins: input, output

3. ESP8266

   • Description: Microcontroller used to read the soil moisture sensor and communicate the data.
   • Pins: 3V, G, D8, D7, D6, D5, D4, D3, D2, D1, D0, A0, S3, S2, S1, SC, S0, SK, EN, VIN, RST, VU

4. Soil Moisture Sensor

   • Description: Measures the moisture level in the soil.
   • Pins: gnd, vcc, aout

Wiring Details

9V Battery

• Pin - is connected to:

  • ESP8266: Pin G

• Pin + is connected to:

  • Rocker Switch: Pin input

Rocker Switch

• Pin input is connected to:

  • 9V Battery: Pin +

• Pin output is connected to:

  • ESP8266: Pin VIN

ESP8266

• Pin G is connected to:

  • 9V Battery: Pin -
  • Soil Moisture Sensor: Pin gnd

• Pin VIN is connected to:

  • Rocker Switch: Pin output

• Pin A0 is connected to:

  • Soil Moisture Sensor: Pin aout

• Pin 3V is connected to:

  • Soil Moisture Sensor: Pin vcc

Soil Moisture Sensor

• Pin gnd is connected to:

  • ESP8266: Pin G

• Pin vcc is connected to:

  • ESP8266: Pin 3V

• Pin aout is connected to:

  • ESP8266: Pin A0

Code Documentation

Code for ESP8266

// Define the pin for the soil moisture sensor
const int soilMoisturePin = A0;

void setup() {
  // Initialize serial communication at 9600 baud rate
  Serial.begin(9600);
}

void loop() {
  // Read the analog value from the soil moisture sensor
  int soilMoistureValue = analogRead(soilMoisturePin);
  
  // Print the soil moisture value to the Serial Monitor
  Serial.print("Soil Moisture Value: ");
  Serial.println(soilMoistureValue);
  
  // Wait for 1 second before taking another reading
  delay(1000);
}

File Name: sketch.ino

This code initializes the ESP8266 to read the analog value from the soil moisture sensor connected to pin A0. The value is then printed to the Serial Monitor every second.