IoT Health Monitoring System

Overview

This project aims to create a health monitoring system using an ESP32, Heart Rate Pulse Sensor, DHT11 Temperature Sensor, and IoT platforms such as ThingSpeak and IFTTT. It measures a patient's heart rate and body temperature and uploads this data to ThingSpeak for real-time monitoring. Additionally, it triggers an alert using IFTTT if the heart rate exceeds 120 BPM or the temperature goes above 35°C.

Features

• Real-time Health Monitoring: Monitors heart rate (BPM) and body temperature.
• Data Logging: Sends the heart rate and temperature data to the ThingSpeak cloud for storage and analysis.
• Automated Alerts: Triggers an IFTTT alert if any critical condition is detected, like heart rate > 120 BPM or temperature > 35°C.
• Wi-Fi Connectivity: Uses ESP32 to connect to the internet for data transmission.

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Components Used

• ESP32 Microcontroller
• Heart Rate Pulse Monitor Sensor
• DHT11 Temperature Sensor
• Jumper Wires
• Breadboard

Libraries Required

Ensure you have these libraries installed in the Arduino IDE:

1. PulseSensorPlayground – for managing the Pulse Sensor.
2. DHT – for interfacing with the DHT11 temperature sensor.
3. WiFi – to connect the ESP32 to a Wi-Fi network.
4. HTTPClient – to send data to ThingSpeak and trigger IFTTT alerts.

To install libraries, go to Sketch -> Include Library -> Manage Libraries, then search and install the required libraries.

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Circuit Diagram

Component	ESP32 Pin	Description
Heart Rate Sensor VCC	3.3V	Power for the sensor
Heart Rate Sensor GND	GND	Ground
Heart Rate Sensor Signal	GPIO34	Reads heart rate signal
DHT11 VCC	3.3V	Power for DHT11
DHT11 GND	GND	Ground
DHT11 Data Pin	GPIO23	Reads temperature data
On-board LED	GPIO2	Blinks when heart rate detected

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ThingSpeak and IFTTT Setup

1. ThingSpeak: Create a ThingSpeak account and set up a new channel. Get the API Key from ThingSpeak and replace it in the code (apiKey variable).
2. IFTTT: Set up an IFTTT Webhook to trigger alerts for heart rate or temperature thresholds. Replace the IFTTT Webhook key and event name in the code with your own (ifttt_key and ifttt_event_name variables).

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Code Explanation

• Heart Rate Monitoring:
  • The PulseSensorPlayground library reads the heart rate signal from the Pulse Monitor Sensor on GPIO 34.
  • The sawStartOfBeat() method detects a heartbeat and calculates the BPM.
• Temperature Monitoring:
  • The DHT11 sensor measures the temperature using the readTemperature() method.
• ThingSpeak Integration:
  • Every 15 seconds, the ESP32 sends the latest heart rate and temperature data to ThingSpeak using HTTPClient.
• IFTTT Alert:
  • If the heart rate exceeds 120 BPM or the temperature is higher than 35°C, an alert is sent via IFTTT using a POST request.

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How to Use

1. Connect the components as described in the circuit diagram.
2. Upload the code to your ESP32 via the Arduino IDE.
3. Monitor the data:
   • Open the Serial Monitor in the Arduino IDE to see the heart rate and temperature readings.
   • View the data logged in ThingSpeak.
4. Receive alerts:
   • If the heart rate or temperature crosses the threshold, receive an alert via IFTTT.

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Contributing

Feel free to open issues or submit pull requests if you'd like to improve the project.

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License

This project is licensed under the MIT License. See the LICENSE file for details.

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