ESP32-Based Health Monitoring System with Blynk App

Introduction

• Channel: Just Electronics
• Topic: ESP32-based health monitoring system using Blynk app.
• Sensors Used: DHT11, DS18B20, MAX30100
• Platform: ESP32

Components

1. ESP32 Module

• Central processing unit for the system.

2. Sensors

• DHT11 Sensor: Measures temperature and humidity.
• MAX30100 Sensor: Measures heart rate (BPM) and SpO2 levels.
• DS18B20 Sensor: Digital temperature sensor, also waterproof.

Circuit Connections

• VCC and Ground: Common VCC and Ground for all sensors.
• SCL and SDA Pins:
  • SCL connected to D22 on ESP32
  • SDA connected to D21 on ESP32
• DHT11 Sensor Output: Connected to D18 on ESP32
• DS18B20 Sensor Output: Connected to D5 on ESP32 with a 4.7k Ohms resistor between VCC and D5

Assembly

• PCB Used: Zero PCB
• Components Mounted: ESP32, MAX30100, DHT11 sensors mounted using female headers, waterproof DS18B20 sensor soldered directly.
• Additional Components: 4.7 kOhms resistor used in connection with DS18B20 sensor.

Functionality & Working

• Real-Time Data Monitoring: Data from sensors sent to Blynk app in real-time.
• MAX30100 Sensor:
  • Measures SpO2 and BPM.
  • Data displayed in Blynk app.
• DHT11 Sensor:
  • Measures temperature and humidity.
  • Data displayed in Blynk app.
  • Real-time updates when exposed to heat.
• DS18B20 Sensor:
  • Measures temperature.
  • Data displayed in Blynk app.

Demonstration

• Real-time monitoring with visual feedback in Blynk app.
• Changes in heartbeat, SpO2, temperature, and humidity can be observed in the app.

Conclusion

• Summary: Demonstrated a health monitoring system using ESP32 and various sensors with real-time data updates on the Blynk app.
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