Circuit Documentation

Summary

This circuit integrates an Arduino UNO microcontroller with various sensors and modules to monitor temperature, heart rate, and SpO2 levels. It also includes a WiFi module for connectivity and an OLED display for visual output. The components are interconnected to facilitate data acquisition, processing, and display.

Component List

1. Arduino UNO

   • Description: A microcontroller board based on the ATmega328P.
   • Pins: UNUSED, IOREF, Reset, 3.3V, 5V, GND, Vin, A0, A1, A2, A3, A4, A5, SCL, SDA, AREF, D13, D12, D11, D10, D9, D8, D7, D6, D5, D4, D3, D2, D1, D0

2. MAX30100

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

3. 0.96" OLED

   • Description: OLED display module.
   • Pins: GND, VDD, SCK, SDA

4. DS18B20

   • Description: Digital temperature sensor.
   • Pins: signal, GND, vcc

5. ESP8266 ESP-12F WiFi Module

   • Description: WiFi module for wireless communication.
   • Pins: GND, GPIO15, GPIO2, GPIO0, GPIO4, GPIO5, RXD0, TXD0, RST, ADC0, EN, GPIO16, GPIO14, GPIO12, GPIO13, VCC, SCLK, MOSI, GPIO10, GPIO9, MISO, CS0

6. AD8232 HeartRate Monitor

   • Description: Heart rate monitor sensor.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

7. Green Button

   • Description: Push button.
   • Pins: OUT, VCC, GND

Wiring Details

Arduino UNO

• 3.3V connected to:

  • ESP8266 ESP-12F WiFi Module (VCC)
  • MAX30100 (VIN)
  • AD8232 HeartRate Monitor (3.3v)

• 5V connected to:

  • DS18B20 (vcc)
  • 0.96" OLED (VDD)
  • Green Button (VCC)

• GND connected to:

  • DS18B20 (GND)
  • ESP8266 ESP-12F WiFi Module (GND)
  • MAX30100 (GND)
  • Green Button (GND)
  • 0.96" OLED (GND)
  • AD8232 HeartRate Monitor (GND)

• A0 connected to:

  • AD8232 HeartRate Monitor (OUTPUT)

• SCL connected to:

  • 0.96" OLED (SCK)
  • MAX30100 (SCL)

• SDA connected to:

  • 0.96" OLED (SDA)
  • MAX30100 (SDA)

• D8 connected to:

  • AD8232 HeartRate Monitor (LO-)

• D7 connected to:

  • AD8232 HeartRate Monitor (LO+)

• D4 connected to:

  • Green Button (OUT)

• D2 connected to:

  • DS18B20 (signal)

• D1 connected to:

  • ESP8266 ESP-12F WiFi Module (RXD0)

• D0 connected to:

  • ESP8266 ESP-12F WiFi Module (TXD0)

MAX30100

• VIN connected to:

  • Arduino UNO (3.3V)

• SDA connected to:

  • Arduino UNO (SDA)

• SCL connected to:

  • Arduino UNO (SCL)

• GND connected to:

  • Arduino UNO (GND)

0.96" OLED

• VDD connected to:

  • Arduino UNO (5V)

• SCK connected to:

  • Arduino UNO (SCL)

• SDA connected to:

  • Arduino UNO (SDA)

• GND connected to:

  • Arduino UNO (GND)

DS18B20

• vcc connected to:

  • Arduino UNO (5V)

• GND connected to:

  • Arduino UNO (GND)

• signal connected to:

  • Arduino UNO (D2)

ESP8266 ESP-12F WiFi Module

• VCC connected to:

  • Arduino UNO (3.3V)

• GND connected to:

  • Arduino UNO (GND)

• RXD0 connected to:

  • Arduino UNO (D1)

• TXD0 connected to:

  • Arduino UNO (D0)

AD8232 HeartRate Monitor

• 3.3v connected to:

  • Arduino UNO (3.3V)

• GND connected to:

  • Arduino UNO (GND)

• OUTPUT connected to:

  • Arduino UNO (A0)

• LO- connected to:

  • Arduino UNO (D8)

• LO+ connected to:

  • Arduino UNO (D7)

Green Button

• VCC connected to:

  • Arduino UNO (5V)

• GND connected to:

  • Arduino UNO (GND)

• OUT connected to:

  • Arduino UNO (D4)

Code Documentation

#include <Wire.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <MAX30100_PulseOximeter.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define ONE_WIRE_BUS 2
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

#define BUTTON_PIN 4
#define ECG_PIN A0
#define LO_PLUS_PIN 7
#define LO_MINUS_PIN 8

PulseOximeter pox;

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT);
  pinMode(LO_PLUS_PIN, INPUT);
  pinMode(LO_MINUS_PIN, INPUT);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
  sensors.begin();
  pox.begin();
}

void loop() {
  sensors.requestTemperatures();
  float temperature = sensors.getTempCByIndex(0);
  pox.update();
  float heartRate = pox.getHeartRate();
  float SpO2 = pox.getSpO2();
  int ecgValue = analogRead(ECG_PIN);
  bool loPlus = digitalRead(LO_PLUS_PIN);
  bool loMinus = digitalRead(LO_MINUS_PIN);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Temp: ");
  display.print(temperature);
  display.println(" C");
  display.print("HR: ");
  display.print(heartRate);
  display.println(" bpm");
  display.print("SpO2: ");
  display.print(SpO2);
  display.println(" %");
  display.print("ECG: ");
  display.println(ecgValue);
  display.print("LO+: ");
  display.println(loPlus);
  display.print("LO-: ");
  display.println(loMinus);
  display.display();
  delay(1000);
}

This code initializes the sensors and display, reads data from the sensors, and displays the data on the OLED screen. The loop continuously updates the display with the latest sensor readings.