Circuit Documentation

Summary

This document provides a detailed overview of a circuit designed to monitor heart rate, SpO2 levels, and environmental conditions using various sensors and an ESP32 microcontroller. The circuit includes an AD8232 Heart Rate Monitor, MAX30102 HR + SpO2 sensor, DHT11 temperature and humidity sensor, MPU-9250/6500/9255 IMU, and a 16x2 I2C LCD for display. Power is supplied by a 5V battery.

Component List

1. AD8232 Heart Rate Monitor

   • Description: Monitors heart rate by measuring electrical activity of the heart.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

2. MAX30102 HR + SpO2 sensor

   • Description: Measures heart rate and SpO2 levels.
   • Pins: INT, IRD, RD, GND, SCL, SDA, VIN

3. DHT11

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

4. ESP32 38 PINS

   • Description: Microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: GND, 23, 22/SCL, 1, 2, 21/SDA, 19, 18, 5, 17/TX2, 16/RX2, 4, 0, 15, D1, D0, CLK, 3V3, EN, VP, VN, 34, 35, 32, 33, 25, 26, 27, 14, 12, 13, D2, D3, 11, 5V/VIN

5. 16x2 I2C LCD

   • Description: Displays data on a 16x2 character LCD using I2C communication.
   • Pins: GND, VCC, SDA, SCL

6. MPU-9250/6500/9255

   • Description: 9-axis IMU sensor for motion tracking.
   • Pins: VCC, GND, SCL/SCLK, SDA/SDI, EDA, ECL, ADO/SDO, INT, NCS, FSYNC

7. 5V Battery

   • Description: Provides power to the circuit.
   • Pins: positive, negative

Wiring Details

AD8232 Heart Rate Monitor

• GND connected to common ground.
• 3.3v connected to ESP32 3V3.
• OUTPUT connected to ESP32 pin 0.

MAX30102 HR + SpO2 sensor

• GND connected to common ground.
• VIN connected to ESP32 3V3.
• SCL connected to ESP32 pin 19.
• SDA connected to ESP32 pin 18.

DHT11

• VCC connected to ESP32 3V3.
• GND connected to common ground.
• DATA connected to ESP32 pin 23.

ESP32 38 PINS

• GND connected to common ground.
• 3V3 connected to 3.3v power rail.
• 0 connected to AD8232 OUTPUT.
• 21/SDA connected to MPU-9250/6500/9255 SDA/SDI and 16x2 I2C LCD SDA.
• 22/SCL connected to MPU-9250/6500/9255 SCL/SCLK and 16x2 I2C LCD SCL.
• 19 connected to MAX30102 SCL.
• 18 connected to MAX30102 SDA.
• 23 connected to DHT11 DATA.
• 5V/VIN connected to 5V battery positive terminal.

16x2 I2C LCD

• GND connected to common ground.
• VCC connected to ESP32 3V3.
• SDA connected to ESP32 pin 21/SDA.
• SCL connected to ESP32 pin 22/SCL.

MPU-9250/6500/9255

• GND connected to common ground.
• VCC connected to ESP32 3V3.
• SDA/SDI connected to ESP32 pin 21/SDA.
• SCL/SCLK connected to ESP32 pin 22/SCL.

5V Battery

• positive connected to ESP32 5V/VIN.
• negative connected to common ground.

Code

No code was provided for this circuit.