Circuit Documentation

Summary

This circuit integrates various sensors and modules to collect environmental data and display it on an LCD panel. The main components include a DS18B20 temperature sensor, a BME280 environmental sensor, a SIM800L GSM module, a piezo buzzer, a 20x4 I2C LCD panel, and an ESP32 microcontroller. The circuit is powered by a 5V battery.

Component List

1. DS18B20 Module

   • Description: Digital temperature sensor.
   • Pins: VCC, DQ, GND

2. SIM800L

   • Description: GSM/GPRS module for communication.
   • Pins: NFT, RING, VCC, DTR, RST, MIC +, RXD, MIC-, TXD, SPK+, GND, SPK-

3. Piezo Buzzer

   • Description: Audio signaling device.
   • Pins: pin 1, pin 2

4. 20x4 I2C LCD Panel

   • Description: Display panel for showing data.
   • Pins: GND, VCC, SDA, SCL

5. Adafruit BME280

   • Description: Environmental sensor for temperature, humidity, and pressure.
   • Pins: VCC, 3.3V, GND, SCK/SCL, SDO/ADR, SDI/SDA, CS

6. 5V Battery

   • Description: Power source for the circuit.
   • Pins: positive, negative

7. ESP32 (30 pin)

   • Description: Microcontroller for processing and control.
   • Pins: EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, GND, Vin, D23, D22, TX0, RX0, D21, D19, D18, D5, TX2, RX2, D4, D2, D15, 3V3

Wiring Details

DS18B20 Module

• VCC connected to 5V Battery positive
• GND connected to ESP32 GND

SIM800L

• VCC connected to 5V Battery positive
• GND connected to 5V Battery negative
• RXD connected to ESP32 TX2
• TXD connected to ESP32 RX2

Piezo Buzzer

• pin 1 connected to ESP32 GND
• pin 2 connected to ESP32 D25

20x4 I2C LCD Panel

• GND connected to 5V Battery negative
• VCC connected to ESP32 3V3
• SDA connected to ESP32 D21
• SCL connected to ESP32 D22

Adafruit BME280

• VCC connected to 5V Battery positive
• GND connected to ESP32 GND
• SCK/SCL connected to ESP32 D22
• SDI/SDA connected to ESP32 D21

5V Battery

• positive connected to DS18B20 Module VCC, Adafruit BME280 VCC, SIM800L VCC, ESP32 Vin
• negative connected to SIM800L GND, ESP32 GND, 20x4 I2C LCD Panel GND

ESP32 (30 pin)

• Vin connected to 5V Battery positive
• GND connected to 5V Battery negative, DS18B20 Module GND, Adafruit BME280 GND, Piezo Buzzer pin 1
• D21 connected to Adafruit BME280 SDI/SDA, 20x4 I2C LCD Panel SDA
• D22 connected to Adafruit BME280 SCK/SCL, 20x4 I2C LCD Panel SCL
• TX2 connected to SIM800L RXD
• RX2 connected to SIM800L TXD
• D25 connected to Piezo Buzzer pin 2
• 3V3 connected to 20x4 I2C LCD Panel VCC

Documented Code

DS18B20 Module

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

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

SIM800L

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

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

20x4 I2C LCD Panel

/*
 * This Arduino Sketch reads pressure from a BME280 sensor and temperature
 * from a DS18B20 sensor, then displays these readings on a 20x4 I2C LCD panel.
 */

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>

#define BME280_ADDRESS 0x76
#define ONE_WIRE_BUS 4

Adafruit_BME280 bme;
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(115200);
  if (!bme.begin(BME280_ADDRESS)) {
    Serial.println("Could not find a valid BME280 sensor, check wiring!");
    while (1);
  }
  sensors.begin();
  lcd.init();
  lcd.backlight();
}

void loop() {
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);
  float pressure = bme.readPressure() / 100.0F;

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");
  lcd.setCursor(0, 1);
  lcd.print("Pressure: ");
  lcd.print(pressure);
  lcd.print(" hPa");

  delay(2000);
}

Adafruit BME280

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

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

5V Battery

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

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

ESP32 (30 pin)

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

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