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ESP32-Based Water Quality Monitoring System with SIM900A Communication

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Circuit Documentation

Summary

This circuit is designed to monitor water quality using various sensors connected to an ESP32 Devkit V1. The sensors include a DS18B20 temperature sensor, a turbidity sensor, a water level sensor, a PH meter, an MQ135 air quality sensor, and a SIM900A module for communication. The ESP32 reads data from these sensors and can communicate the results via the SIM900A module.

Component List

  1. ESP32 Devkit V1

    • Description: A microcontroller with Wi-Fi and Bluetooth capabilities.
    • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN

  2. DS18B20 Temperature Sensor

    • Description: A digital temperature sensor.
    • Pins: GND, VCC, OUT

  3. Turbidity Sensor

    • Description: A sensor to measure the turbidity (cloudiness) of water.
    • Pins: OUT, VCC, GND

  4. Water Level Sensor

    • Description: A sensor to measure the water level.
    • Pins: SIG, VCC, GND

  5. SIM900A

    • Description: A GSM/GPRS module for communication.
    • Pins: GND, DB9-3 (RXD), DB9-2 (TXD), 5V, 3VR, 5VR, 3VT, 5VT, VCC, Ring, RESTART, RESET, STATUS

  6. MQ135

    • Description: An air quality sensor.
    • Pins: VCC, GND, A0, D0

  7. PH Meter

    • Description: A sensor to measure the pH level of water.
    • Pins: Signal, VCC, GND

Wiring Details

ESP32 Devkit V1

DS18B20 Temperature Sensor

Turbidity Sensor

Water Level Sensor

SIM900A

MQ135

PH Meter

Code Documentation

/*
 * This Arduino Sketch is designed to check water quality using various sensors
 * connected to an ESP32 Devkit V1. The sensors include a DS18B20 temperature
 * sensor, a turbidity sensor, a water level sensor, a PH meter, an MQ135 air
 * quality sensor, and a SIM900A module for communication.
 */

#include <OneWire.h>
#include <DallasTemperature.h>

// Pin definitions
#define DS18B20_PIN 13
#define TURBIDITY_OUT_PIN 32
#define WATER_LEVEL_SIG_PIN 27
#define PH_SIGNAL_PIN 39
#define MQ135_A0_PIN 15
#define MQ135_D0_PIN 2

// OneWire and DallasTemperature instances
OneWire oneWire(DS18B20_PIN);
DallasTemperature sensors(&oneWire);

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize sensors
  sensors.begin();
  pinMode(TURBIDITY_OUT_PIN, INPUT);
  pinMode(WATER_LEVEL_SIG_PIN, INPUT);
  pinMode(PH_SIGNAL_PIN, INPUT);
  pinMode(MQ135_A0_PIN, INPUT);
  pinMode(MQ135_D0_PIN, INPUT);
}

void loop() {
  // Read temperature from DS18B20
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  // Read turbidity sensor
  int turbidity = analogRead(TURBIDITY_OUT_PIN);
  Serial.print("Turbidity: ");
  Serial.println(turbidity);

  // Read water level sensor
  int waterLevel = analogRead(WATER_LEVEL_SIG_PIN);
  Serial.print("Water Level: ");
  Serial.println(waterLevel);

  // Read PH meter
  int phValue = analogRead(PH_SIGNAL_PIN);
  Serial.print("PH Value: ");
  Serial.println(phValue);

  // Read MQ135 sensor
  int mq135A0 = analogRead(MQ135_A0_PIN);
  int mq135D0 = digitalRead(MQ135_D0_PIN);
  Serial.print("MQ135 A0: ");
  Serial.println(mq135A0);
  Serial.print("MQ135 D0: ");
  Serial.println(mq135D0);

  // Delay before next reading
  delay(2000);
}

This code initializes the sensors and reads data from them in a loop, printing the results to the serial monitor. The delay of 2000 milliseconds ensures that the readings are taken at regular intervals.