Circuit Documentation

Summary

This circuit is designed to measure eye pressure and detect changes in the surface using an array of sensors, including a TCRT 5000 IR sensor and a TOF10120 distance sensor. The data from these sensors is processed by an Arduino UNO microcontroller and displayed on a 0.96" OLED screen. The circuit is powered by a 9V battery, which is controlled by a rocker switch. The purpose of this circuit is to determine eye pressure status and ensure the correct positioning of an air puff for eye pressure measurement.

Component List

Arduino UNO

• Microcontroller board based on the ATmega328P
• Used for processing sensor data and controlling the OLED display

0.96" OLED

• Small display screen for visual output
• Displays eye pressure status and other information

TOF10120

• Time-of-flight distance sensor
• Measures the distance to the cornea to ensure correct air puff direction

9V Battery

• Provides power to the circuit

TCRT 5000 IR SENSOR

• Infrared reflective sensor
• Detects changes in the surface and eye pressure

Rocker Switch

• Mechanical switch to control the power supply to the circuit

Wiring Details

Arduino UNO

• 3.3V connected to OLED VDD and TOF10120 VCC
• 5V connected to TCRT 5000 IR SENSOR VCC
• GND connected to OLED GND, TCRT 5000 IR SENSOR GND, TOF10120 GND, and one side of the Rocker Switch
• Vin connected to the other side of the Rocker Switch
• A3 connected to TCRT 5000 IR SENSOR AO
• A4 (SDA) connected to OLED SDA and TOF10120 SDL
• A5 (SCL) connected to OLED SCK and TOF10120 SCL
• D2 connected to TCRT 5000 IR SENSOR DO
• D1 (TX) connected to TOF10120 TXD

0.96" OLED

• GND connected to Arduino UNO GND
• VDD connected to Arduino UNO 3.3V
• SCK connected to Arduino UNO A5
• SDA connected to Arduino UNO A4

TOF10120

• RXD not connected
• TXD connected to Arduino UNO D1
• SDL connected to Arduino UNO A4
• VCC connected to Arduino UNO 3.3V
• SCL connected to Arduino UNO A5
• GND connected to Arduino UNO GND

9V Battery

• + connected to one side of the Rocker Switch
• - connected to Arduino UNO GND

TCRT 5000 IR SENSOR

• VCC connected to Arduino UNO 5V
• GND connected to Arduino UNO GND
• DO connected to Arduino UNO D2
• AO connected to Arduino UNO A3

Rocker Switch

• One side connected to 9V Battery +
• The other side connected to Arduino UNO Vin
• Middle pin connected to Arduino UNO GND

Documented Code

Arduino UNO Code

/*
 * This Arduino Sketch reads data from the TCRT 5000 IR sensor and the TOF10120
 * sensor to determine eye pressure. It then displays the eye pressure status
 * (high, normal, or low) on a 0.96" OLED display. The eye pressure is
 * considered high if above 21 mmHg, normal if between 10 and 21 mmHg, and low
 * if below 10 mmHg.
 */

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

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

#define IR_SENSOR_DO 2
#define IR_SENSOR_AO A3
#define TOF_RX 1
#define TOF_TX 0

void setup() {
  pinMode(IR_SENSOR_DO, INPUT);
  pinMode(IR_SENSOR_AO, INPUT);
  Serial.begin(9600);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.display();
  delay(2000);
  display.clearDisplay();
}

void loop() {
  int irValue = analogRead(IR_SENSOR_AO);
  float eyePressure = map(irValue, 0, 1023, 0, 30);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Eye Pressure: ");
  display.print(eyePressure);
  display.print(" mmHg");
  display.setCursor(0, 10);
  if (eyePressure > 21) {
    display.print("Status: High");
  } else if (eyePressure >= 10) {
    display.print("Status: Normal");
  } else {
    display.print("Status: Low");
  }
  display.display();
  delay(1000);
}

(Note: The code for the other microcontroller instances appears to be mistakenly provided, as there is only one Arduino UNO in the circuit. The code for the TOF10120 and TCRT 5000 IR SENSOR is integrated into the Arduino UNO code.)