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 output devices.

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: Measures Galvanic Skin Response.
   • Pins: GND, VCC, OUT

3. AD8232 HeartRate Monitor

   • Description: Measures heart rate.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

4. DFrobot DHT22 Temperature & Humidity Sensor V2

   • Description: Measures temperature and humidity.
   • Pins: Signal, VCC, GND

5. 16x2 I2C LCD

   • Description: Displays data on a 16x2 character LCD.
   • 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: Provides 12V power to the circuit.
   • Pins: +, -

8. Myoware 2.0 Muscle Sensor

   • Description: Measures muscle activity.
   • Pins: VIN, GND, ENV

9. Relay Module

   • Description: Controls high voltage devices.
   • Pins: NC, COM, INPUT, GND, VCC

10. Buzzer Module

    • Description: Emits sound for alerts.
    • Pins: GND, Vcc, I/O

11. LED: Two Pin (red)

    • Description: Indicates status with light.
    • Pins: cathode, anode

12. Resistor

    • Description: Limits current flow.
    • Pins: pin1, pin2
    • Properties: Resistance: 220 Ohms

Wiring Details

Arduino UNO

• 5V connected to:

  • VCC of SIM 800L
  • VCC of DFrobot DHT22 Temperature & Humidity Sensor V2
  • Vcc of Buzzer Module
  • VCC of 16x2 I2C LCD
  • VCC of Relay Module

• 3.3V connected to:

  • VIN of Myoware 2.0 Muscle Sensor
  • 3.3v of AD8232 HeartRate Monitor

• GND connected to:

  • cathode of LED: Two Pin (red)
  • GND of Buzzer Module
  • GND of SIM 800L
  • GND of Relay Module
  • GND of AD8232 HeartRate Monitor
  • GND of 16x2 I2C LCD
  • GND of DFrobot DHT22 Temperature & Humidity Sensor V2
  • GND of Myoware 2.0 Muscle Sensor
  • • of 12V Power Supply

• Vin connected to:

  • • of 12V Power Supply

• A0 connected to:

  • OUT of GSR Sensor

• A1 connected to:

  • OUTPUT of AD8232 HeartRate Monitor

• A2 connected to:

  • SDA of 16x2 I2C LCD

• A3 connected to:

  • SCL of 16x2 I2C LCD

• A5 connected to:

  • ENV of Myoware 2.0 Muscle Sensor

• D11 connected to:

  • TXD of SIM 800L

• D10 connected to:

  • RXD of SIM 800L

• D9 connected to:

  • pin1 of Resistor

• D8 connected to:

  • I/O of Buzzer Module

• D7 connected to:

  • INPUT of Relay Module

• D2 connected to:

  • Signal of DFrobot DHT22 Temperature & Humidity Sensor V2

• GND connected to:

  • • of 12V Power Supply

GSR Sensor

• OUT connected to:
  • A0 of Arduino UNO

AD8232 HeartRate Monitor

• OUTPUT connected to:
  • A1 of Arduino UNO

DFrobot DHT22 Temperature & Humidity Sensor V2

• Signal connected to:
  • D2 of Arduino UNO

16x2 I2C LCD

• SDA connected to:

  • A2 of Arduino UNO

• SCL connected to:

  • A3 of Arduino UNO

Myoware 2.0 Muscle Sensor

• ENV connected to:
  • A5 of Arduino UNO

SIM 800L

• TXD connected to:

  • D11 of Arduino UNO

• RXD connected to:

  • D10 of Arduino UNO

Resistor

• pin1 connected to:

  • D9 of Arduino UNO

• pin2 connected to:

  • anode of LED: Two Pin (red)

Buzzer Module

• I/O connected to:
  • D8 of Arduino UNO

Relay Module

• INPUT connected to:
  • D7 of Arduino UNO

12V Power Supply

• + connected to:

  • Vin of Arduino UNO

• - connected to:

  • GND of Arduino UNO

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 generator
  }
  // Stop steam generator if hydration exceeds limit
  if (gsrValue > 600) { // Example threshold
    digitalWrite(relayPin, LOW); // Turn off steam generator
    digitalWrite(buzzerPin, HIGH