Dehydration Monitor Using Arduino Uno with GSM Alert

This project is designed to monitor key physiological indicators to infer dehydration and send alerts via SMS using a GSM module. The monitor uses sensors for skin moisture, body temperature, and heart rate to provide real-time alerts on an OLED display and via SMS to a predefined number.

1. Project Objectives

Monitor Physiological Parameters:
- Detect signs of dehydration using moisture, temperature, and heart rate.
Alert System:
- Notify users locally (buzzer/LED) and remotely (SMS via GSM module).
User-Friendly Interface:
- Display real-time data on an OLED screen.
Portability:
- Compact design suitable for wearable or portable devices.

2. Components

Microcontroller:

Arduino Uno: Acts as the brain of the system, processing sensor data and controlling outputs.

Sensors:

Skin Moisture Sensor:
- Measures moisture levels on the skin.
- Example: Capacitive touch sensor or soil moisture sensor.
Temperature Sensor:
- Measures body temperature.
- Examples: DS18B20 (accurate), DHT11/DHT22 (temperature and humidity combined).
Heart Rate Sensor:
- Monitors pulse rate.
- Example: Pulse Sensor, MAX30100.

Output Devices:

OLED Display:
- Displays sensor readings in real-time.
- Example: I2C OLED (128x64 pixels).
Buzzer:
- Audible alert for dehydration warnings.
LEDs:
- Visual alert system.

GSM Module:

SIM800L/SIM900:
- Sends SMS alerts when dehydration is detected.

Power Supply:

5V power supply or rechargeable battery (Li-ion or equivalent for portability).

3. Features

Parameter Monitoring:
- Moisture, temperature, and heart rate monitoring.
Real-Time Data Display:
- OLED shows readings continuously.
Local Alerts:
- Buzzer and LEDs alert the user immediately.
Remote Alerts:
- SMS sent to predefined contacts using the GSM module.

4. Concepts

Dehydration Indicators:

Low Skin Moisture:
- Skin dryness is a key indicator of dehydration.
Elevated Body Temperature:
- Dehydration can cause overheating.
Abnormal Heart Rate:
- Low hydration affects heart rate variability.

Threshold Values:

Moisture: <30% (example threshold, adjustable based on calibration).
Temperature: >37.5°C.
Heart Rate: <50 bpm (example for resting heart rate).

5. Circuit Diagram

Connections:

Skin Moisture Sensor:
- Analog output to Arduino A0.
Temperature Sensor (DS18B20):
- Data pin to D2 with a pull-up resistor.
Heart Rate Sensor:
- Analog output to A1.
OLED Display:
- I2C pins: SDA to A4, SCL to A5.
GSM Module:
- RX to Arduino TX (D10).
- TX to Arduino RX (D11).
- VCC to 3.7V or 5V depending on module type.
Buzzer:
- Positive to D4, negative to GND.
LEDs:
- Positive to D5-D6 with 330-ohm resistors, negative to GND

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Full Name:	Dehydration Monitor Using Arduino Uno with GSM Alert
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City:	Coimbatore
Pincode:	641042

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Aarumuga Koundanpudur

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