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Arduino-Based Health Monitoring System with GSM and LCD Display

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Circuit Documentation

Summary

This circuit is designed to monitor various physiological parameters using multiple sensors and display the data on an LCD screen. It also includes a GSM module for sending SMS alerts and a relay module to control a steam generator. The circuit is built around an Arduino UNO microcontroller, which reads data from the sensors and controls the other components.

Component List

  1. Arduino UNO

    • Description: 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. GSR Sensor

    • Description: Galvanic Skin Response sensor to measure skin conductivity.
    • Pins: GND, VCC, OUT

  3. AD8232 HeartRate Monitor

    • Description: Heart rate monitor sensor.
    • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

  4. DFrobot DHT22 Temperature & Humidity Sensor V2

    • Description: Temperature and humidity sensor.
    • Pins: Signal, VCC, GND

  5. 16x2 I2C LCD

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

  6. SIM 800L

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

  7. 12V Power Supply

    • Description: Power supply providing 12V.
    • Pins: +, -

  8. Myoware 2.0 Muscle Sensor

    • Description: Muscle sensor to measure muscle activity.
    • Pins: VIN, GND, ENV

  9. Relay Module

    • Description: Relay module to control high voltage devices.
    • Pins: NC, COM, INPUT, GND, VCC

  10. Buzzer Module

    • Description: Buzzer for audio alerts.
    • Pins: GND, Vcc, I/O

  11. LED: Two Pin (red)

    • Description: Red LED for visual alerts.
    • Pins: cathode, anode

  12. Resistor

    • Description: 220 Ohms resistor.
    • Pins: pin1, pin2

Wiring Details

Arduino UNO

GSR Sensor

AD8232 HeartRate Monitor

DFrobot DHT22 Temperature & Humidity Sensor V2

16x2 I2C LCD

SIM 800L

12V Power Supply

Myoware 2.0 Muscle Sensor

Relay Module

Buzzer Module

LED: Two Pin (red)

Resistor

Code Documentation

#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>

// Pin Definitions
const int gsrPin = A0;         // GSR Sensor
const int ecgPin = A1;         // ECG Sensor
const int dhtPin = 2;          // DHT22
const int emgPin = A5;         // EMG Sensor
const int relayPin = 7;        // Relay for steam generator
const int buzzerPin = 8;       // Buzzer
const int ledPin = 9;          // Red LED

// GSM Module Pins
SoftwareSerial gsmSerial(10, 11); // RX, TX

// DHT Sensor Initialization
DHT dht(dhtPin, DHT22);

// LCD Display Initialization
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Timing Variables
unsigned long startTime;
const unsigned long maxDuration = 20 * 60 * 1000; // 20 minutes
const unsigned long alertTime = 15 * 60 * 1000;   // 15 minutes

void setup() {
  Serial.begin(9600);
  gsmSerial.begin(9600);
  dht.begin();
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Turn off steam generator
  digitalWrite(buzzerPin, LOW); // Turn off buzzer
  digitalWrite(ledPin, LOW);    // Turn off LED
  lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
  lcd.backlight();
  startTime = millis();
}

void loop() {
  unsigned long currentTime = millis();
  if (currentTime - startTime >= maxDuration) {
    digitalWrite(relayPin, LOW); // Turn off steam generator
    return; // Stop the loop after 20 minutes
  }
  if (currentTime - startTime >= alertTime) {
    digitalWrite(buzzerPin, HIGH); // Turn on buzzer
  }
  // Read Sensors
  int gsrValue = analogRead(gsrPin);
  int ecgValue = analogRead(ecgPin);
  float temperature = dht.readTemperature();
  int emgValue = analogRead(emgPin); // Read EMG sensor
  // Control Steam Generator based on Temperature
  if (temperature < 40) {
    digitalWrite(relayPin, HIGH); // Turn on steam generator
  } else if (temperature > 46) {
    digitalWrite(relayPin, LOW);  // Turn off steam