Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates an ESP32 microcontroller, an AD8232 Heart Rate Monitor, an SD module, a TP4056 Battery Charging Protection Module, and a 3.7V LiPo battery. The circuit is designed to monitor heart rate data, store it on an SD card, and is powered by a rechargeable LiPo battery.

Component List

1. ESP32

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

2. AD8232 Heart Rate Monitor

   • Description: A sensor module used to measure heart rate.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

3. SD Module

   • Description: A module used to interface with an SD card for data storage.
   • Pins: CS, SCK, MOSI, MISO, VCC, GND

4. TP4056 Battery Charging Protection Module (Type C)

   • Description: A module used for charging and protecting a LiPo battery.
   • Pins: OUT +, B+, B-, OUT -, +, -

5. 3.7V LiPo Battery

   • Description: A rechargeable lithium polymer battery.
   • Pins: +Ve, GND

Wiring Details

ESP32

• VP connected to OUTPUT of AD8232 Heart Rate Monitor
• VN connected to LO+ of AD8232 Heart Rate Monitor
• D34 connected to LO- of AD8232 Heart Rate Monitor
• GND connected to:
  • OUT - of TP4056 Battery Charging Protection Module
  • GND of SD Module
  • GND of AD8232 Heart Rate Monitor
• VIN connected to:
  • OUT + of TP4056 Battery Charging Protection Module
  • VCC of SD Module
• 3V3 connected to 3.3v of AD8232 Heart Rate Monitor
• D5 connected to CS of SD Module
• D18 connected to SCK of SD Module
• D19 connected to MISO of SD Module
• D23 connected to MOSI of SD Module

AD8232 Heart Rate Monitor

• OUTPUT connected to VP of ESP32
• LO+ connected to VN of ESP32
• LO- connected to D34 of ESP32
• GND connected to GND of ESP32
• 3.3v connected to 3V3 of ESP32

SD Module

• CS connected to D5 of ESP32
• SCK connected to D18 of ESP32
• MISO connected to D19 of ESP32
• MOSI connected to D23 of ESP32
• VCC connected to VIN of ESP32
• GND connected to GND of ESP32

TP4056 Battery Charging Protection Module (Type C)

• OUT + connected to VIN of ESP32
• OUT - connected to GND of ESP32
• B+ connected to +Ve of 3.7V LiPo Battery
• B- connected to GND of 3.7V LiPo Battery

3.7V LiPo Battery

• +Ve connected to B+ of TP4056 Battery Charging Protection Module
• GND connected to B- of TP4056 Battery Charging Protection Module

Code

There is no code provided for the microcontrollers in this circuit.

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This documentation provides a comprehensive overview of the components and their interconnections in the circuit. Each component is described, and detailed wiring information is provided to ensure accurate assembly and understanding of the circuit.