Circuit Documentation

Summary

This document provides a detailed overview of a circuit that includes an ESP32 Devkit V1 microcontroller, a DHT11 temperature and humidity sensor, a DS18B20 temperature sensor, a MAX30102 pulse oximeter and heart-rate sensor, and a resistor. The circuit is designed to interface these sensors with the ESP32 for data acquisition and processing.

Component List

1. ESP32 Devkit V1

   • Description: A powerful microcontroller with Wi-Fi and Bluetooth capabilities.
   • Pins: 3V3, GND, D15, D2, D4, RX2, TX2, D5, D18, D19, D21, RX0, TX0, D22, D23, EN, VP, VN, D34, D35, D32, D33, D25, D26, D27, D14, D12, D13, VIN

2. DHT11

   • Description: A basic, low-cost digital temperature and humidity sensor.
   • Pins: VCC, GND, DATA

3. DS18B20

   • Description: A digital temperature sensor with a 1-Wire interface.
   • Pins: signal, GND, vcc

4. Resistor

   • Description: A 200 Ohm resistor used for current limiting.
   • Pins: pin1, pin2
   • Properties: Resistance: 200 Ohms

5. MAX30102

   • Description: A pulse oximeter and heart-rate sensor.
   • Pins: VIN, SDA, SCL, GND, RD, IRD, INT

Wiring Details

ESP32 Devkit V1

• 3V3 is connected to:

  • MAX30102 VIN
  • Resistor pin2
  • DHT11 VCC
  • DS18B20 vcc

• GND is connected to:

  • MAX30102 GND
  • DHT11 GND
  • DS18B20 GND

• D21 is connected to MAX30102 SDA

• D22 is connected to MAX30102 SCL

• D19 is connected to MAX30102 INT

• D5 is connected to:

  • Resistor pin1
  • DS18B20 signal

• D18 is connected to DHT11 DATA

DHT11

• VCC is connected to ESP32 3V3
• GND is connected to ESP32 GND
• DATA is connected to ESP32 D18

DS18B20

• vcc is connected to ESP32 3V3
• GND is connected to ESP32 GND
• signal is connected to:
  • Resistor pin1
  • ESP32 D5

Resistor

• pin1 is connected to:
  • DS18B20 signal
  • ESP32 D5
• pin2 is connected to:
  • ESP32 3V3
  • MAX30102 VIN

MAX30102

• VIN is connected to:
  • Resistor pin2
  • ESP32 3V3
• SDA is connected to ESP32 D21
• SCL is connected to ESP32 D22
• GND is connected to ESP32 GND
• INT is connected to ESP32 D19

Code

No code is provided for this circuit.

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This document provides a comprehensive overview of the circuit, including a summary, detailed component list, wiring details, and code section. The wiring details ensure that each component is correctly connected to the ESP32 Devkit V1 microcontroller.