Circuit Documentation

Summary

This document provides a detailed overview of a circuit that integrates various components including an Arduino UNO, an ESP8266 NodeMCU, an LCD Display, sensors, and other peripherals. The circuit is designed to interface multiple sensors and display data on an LCD screen, with additional functionalities such as a buzzer for alerts.

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. ESP8266 NodeMCU

   • Description: A low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capability.
   • Pins: D0, D1, D2, D3, D4, 3V3, GND, D5, D6, D7, D8, RX, TX, A0, RSV, SD3, SD2, SD1, CMD, SD0, CLK, EN, RST, VIN

3. LCD Display (16 pin)

   • Description: A 16x2 character LCD display.
   • Pins: VSS, VDD, VO, RS, R_W, E, DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7, A, K

4. Rotary Potentiometer

   • Description: A variable resistor used to adjust levels.
   • Pins: leg1, wiper, leg2
   • Properties: Resistance: 10k Ohms

5. Resistor

   • Description: A passive electrical component that implements electrical resistance.
   • Pins: pin1, pin2
   • Properties: Resistance: 220 Ohms

6. DS18B20

   • Description: A digital temperature sensor.
   • Pins: signal, GND, vcc

7. AD8232 HeartRate Monitor

   • Description: A sensor for measuring heart rate.
   • Pins: GND, 3.3v, OUTPUT, LO-, LO+, SDN, RA, LA, RL

8. MAX30102 HR + SpO2 sensor

   • Description: A sensor for measuring heart rate and SpO2 levels.
   • Pins: INT, IRD, RD, GND, SCL, SDA, VIN

9. Buzzer Module

   • Description: An audio signaling device.
   • Pins: GND, Vcc, I/O

10. 9V Battery

    • Description: A power source.
    • Pins: -, +

Wiring Details

Arduino UNO

• 5V connected to:

  • ESP8266 NodeMCU VIN
  • LCD Display VDD
  • Rotary Potentiometer leg1
  • DS18B20 vcc
  • Buzzer Module Vcc

• GND connected to:

  • 9V Battery -
  • ESP8266 NodeMCU GND
  • LCD Display VSS
  • Rotary Potentiometer leg2
  • LCD Display R_W
  • Resistor pin2
  • LCD Display K
  • AD8232 HeartRate Monitor GND
  • MAX30102 HR + SpO2 sensor GND
  • DS18B20 GND
  • Buzzer Module GND

• 3.3V connected to:

  • ESP8266 NodeMCU EN
  • AD8232 HeartRate Monitor 3.3v
  • MAX30102 HR + SpO2 sensor VIN

• Vin connected to:

  • 9V Battery +

• A0 connected to:

  • AD8232 HeartRate Monitor OUTPUT

• A4 connected to:

  • MAX30102 HR + SpO2 sensor SDA

• A5 connected to:

  • MAX30102 HR + SpO2 sensor SCL

• D12 connected to:

  • LCD Display RS

• D11 connected to:

  • LCD Display E

• D10 connected to:

  • AD8232 HeartRate Monitor LO+

• D9 connected to:

  • AD8232 HeartRate Monitor LO-

• D8 connected to:

  • DS18B20 signal

• D7 connected to:

  • Buzzer Module I/O

• D5 connected to:

  • LCD Display DB4

• D4 connected to:

  • LCD Display DB5

• D3 connected to:

  • LCD Display DB6

• D2 connected to:

  • LCD Display DB7

• D1 connected to:

  • ESP8266 NodeMCU RX

• D0 connected to:

  • ESP8266 NodeMCU TX

ESP8266 NodeMCU

• VIN connected to:

  • Arduino UNO 5V

• GND connected to:

  • Arduino UNO GND

• EN connected to:

  • Arduino UNO 3.3V

• RX connected to:

  • Arduino UNO D1

• TX connected to:

  • Arduino UNO D0

LCD Display (16 pin)

• VDD connected to:

  • Arduino UNO 5V

• VSS connected to:

  • Arduino UNO GND

• RS connected to:

  • Arduino UNO D12

• R_W connected to:

  • Arduino UNO GND

• E connected to:

  • Arduino UNO D11

• DB4 connected to:

  • Arduino UNO D5

• DB5 connected to:

  • Arduino UNO D4

• DB6 connected to:

  • Arduino UNO D3

• DB7 connected to:

  • Arduino UNO D2

• K connected to:

  • Arduino UNO GND

• A connected to:

  • Resistor pin1

• VO connected to:

  • Rotary Potentiometer wiper

Rotary Potentiometer

• leg1 connected to:

  • Arduino UNO 5V

• leg2 connected to:

  • Arduino UNO GND

• wiper connected to:

  • LCD Display VO

Resistor

• pin1 connected to:

  • LCD Display A

• pin2 connected to:

  • Arduino UNO GND

DS18B20

• vcc connected to:

  • Arduino UNO 5V

• GND connected to:

  • Arduino UNO GND

• signal connected to:

  • Arduino UNO D8

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 D10

• LO- connected to:

  • Arduino UNO D9

MAX30102 HR + SpO2 sensor

• VIN connected to:

  • Arduino UNO 3.3V

• GND connected to:

  • Arduino UNO GND

• SDA connected to:

  • Arduino UNO A4

• SCL connected to:

  • Arduino UNO A5

Buzzer Module

• Vcc connected to:

  • Arduino UNO 5V

• GND connected to:

  • Arduino UNO GND

• I/O connected to:

  • Arduino UNO D7

9V Battery

• + connected to:

  • Arduino UNO Vin

• - connected to:

  • Arduino UNO GND

Documented Code

Arduino UNO 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)