Circuit Documentation

Summary

This circuit is designed to monitor heart rate using an AD8232 Heart Rate Monitor, display the data on an OLED display, and communicate with other devices via a Bluetooth HC-06 module. The circuit is powered by a 18650 Li-Ion battery and controlled by an Arduino Nano.

Component List

1. Arduino Nano

   • Description: A small, complete, and breadboard-friendly board based on the ATmega328P.
   • Pins: D1/TX, D0/RX, RESET, GND, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11/MOSI, D12/MISO, VIN, 5V, A7, A6, A5, A4, A3, A2, A1, A0, AREF, 3V3, D13/SCK

2. AD8232 Heart Rate Monitor

   • Description: A cost-effective board used to measure the electrical activity of the heart.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

3. Bluetooth HC-06

   • Description: A Bluetooth module used for wireless communication.
   • Pins: VCC, GND, TXD, RXD

4. OLED Display 128x32

   • Description: A small OLED display used to show data.
   • Pins: SDA, SCL, VCC, GND

5. 18650 Li-Ion Battery

   • Description: A rechargeable lithium-ion battery.
   • Pins: Positive, Negative

Wiring Details

Arduino Nano

• D1/TX connected to TXD of Bluetooth HC-06
• D0/RX connected to RXD of Bluetooth HC-06
• D5 connected to LO- of AD8232 Heart Rate Monitor
• D6 connected to LO+ of AD8232 Heart Rate Monitor
• GND connected to Negative of 18650 Li-Ion Battery, GND of AD8232 Heart Rate Monitor, GND of OLED Display, GND of Bluetooth HC-06
• 5V connected to Positive of 18650 Li-Ion Battery, 3.3v of AD8232 Heart Rate Monitor, VCC of OLED Display, VCC of Bluetooth HC-06
• A4 connected to SDA of OLED Display
• A3 connected to SCL of OLED Display
• A0 connected to OUTPUT of AD8232 Heart Rate Monitor

AD8232 Heart Rate Monitor

• LO- connected to D5 of Arduino Nano
• LO+ connected to D6 of Arduino Nano
• GND connected to GND of Arduino Nano, Negative of 18650 Li-Ion Battery, GND of OLED Display, GND of Bluetooth HC-06
• 3.3v connected to 5V of Arduino Nano, Positive of 18650 Li-Ion Battery, VCC of OLED Display, VCC of Bluetooth HC-06
• OUTPUT connected to A0 of Arduino Nano

Bluetooth HC-06

• TXD connected to D1/TX of Arduino Nano
• RXD connected to D0/RX of Arduino Nano
• GND connected to GND of Arduino Nano, Negative of 18650 Li-Ion Battery, GND of AD8232 Heart Rate Monitor, GND of OLED Display
• VCC connected to 5V of Arduino Nano, Positive of 18650 Li-Ion Battery, 3.3v of AD8232 Heart Rate Monitor, VCC of OLED Display

OLED Display 128x32

• SDA connected to A4 of Arduino Nano
• SCL connected to A3 of Arduino Nano
• GND connected to GND of Arduino Nano, Negative of 18650 Li-Ion Battery, GND of AD8232 Heart Rate Monitor, GND of Bluetooth HC-06
• VCC connected to 5V of Arduino Nano, Positive of 18650 Li-Ion Battery, 3.3v of AD8232 Heart Rate Monitor, VCC of Bluetooth HC-06

18650 Li-Ion Battery

• Negative connected to GND of Arduino Nano, GND of AD8232 Heart Rate Monitor, GND of OLED Display, GND of Bluetooth HC-06
• Positive connected to 5V of Arduino Nano, 3.3v of AD8232 Heart Rate Monitor, VCC of OLED Display, VCC of Bluetooth HC-06

Documented Code

Arduino Nano Code (sketch.ino)

void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

Additional Documentation (documentation.txt)