Circuit Documentation

Summary

This document provides a detailed overview of a circuit design that includes an ESP32 microcontroller, an AD8232 Heart Rate Monitor, a Voltage Regulator, a Polymer Lithium Ion Battery, a Micro SD Card Module, and an A9G module. The document includes a component list, wiring details, and code documentation.

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. Voltage Regulator

   • Description: A component used to regulate voltage levels.
   • Pins: IN, GND, OUT

4. Polymer Lithium Ion Battery - 850mAh

   • Description: A rechargeable battery used to power the circuit.
   • Pins: GND, VCC

5. Micro SD Card Module

   • Description: A module used to interface with a micro SD card for data storage.
   • Pins: cs, sck, mosi, miso, vcc, gnd

6. A9G

   • Description: A module that provides GPS and GPRS functionalities.
   • Pins: GND, VBET, IO26, TX, RX

Wiring Details

ESP32

• D35 is connected to OUTPUT of the AD8232 Heart Rate Monitor.
• D26 is connected to IO26 of the A9G.
• GND is connected to gnd of the Micro SD Card Module.
• VIN is connected to OUT of the Voltage Regulator.
• 3V3 is connected to vcc of the Micro SD Card Module and 3.3v of the AD8232 Heart Rate Monitor.
• D15 is connected to LO- of the AD8232 Heart Rate Monitor.
• D2 is connected to LO+ of the AD8232 Heart Rate Monitor.
• RX2 is connected to RX of the A9G.
• TX2 is connected to TX of the A9G.
• D5 is connected to cs of the Micro SD Card Module.
• D18 is connected to sck of the Micro SD Card Module.
• D19 is connected to miso of the Micro SD Card Module.
• D23 is connected to mosi of the Micro SD Card Module.

AD8232 Heart Rate Monitor

• OUTPUT is connected to D35 of the ESP32.
• LO- is connected to D15 of the ESP32.
• LO+ is connected to D2 of the ESP32.
• 3.3v is connected to 3V3 of the ESP32.

Voltage Regulator

• IN is connected to VCC of the Polymer Lithium Ion Battery.
• GND is connected to GND of the Polymer Lithium Ion Battery and GND of the A9G.
• OUT is connected to VIN of the ESP32.

Polymer Lithium Ion Battery - 850mAh

• VCC is connected to IN of the Voltage Regulator and VBET of the A9G.
• GND is connected to GND of the Voltage Regulator and GND of the A9G.

Micro SD Card Module

• gnd is connected to GND of the ESP32.
• vcc is connected to 3V3 of the ESP32.
• cs is connected to D5 of the ESP32.
• sck is connected to D18 of the ESP32.
• miso is connected to D19 of the ESP32.
• mosi is connected to D23 of the ESP32.

A9G

• IO26 is connected to D26 of the ESP32.
• RX is connected to RX2 of the ESP32.
• TX is connected to TX2 of the ESP32.
• VBET is connected to VCC of the Polymer Lithium Ion Battery.
• GND is connected to GND of the Polymer Lithium Ion Battery and GND of the Voltage Regulator.

Code Documentation

No code is provided for this circuit.