Study Buddy: Robot Eyes that Monitor Your Study Lighting

1#include <Wire.h>
2#include <Adafruit_GFX.h>
3#include <Adafruit_SSD1306.h>
4
5#define SCREEN_WIDTH 128   // OLED display width, in pixels
6#define SCREEN_HEIGHT 64   // OLED display height, in pixels
7#define OLED_RESET    -1   // Reset pin for OLED (no reset in this configuration)
8#define SCREEN_ADDRESS 0x3C // I2C address for the OLED display
9
10Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
11
12// Define the analog pin for reading light level
13int ReadPin = A0;
14// Variable to store the light level reading from the photoresistor
15int lightLevel = 0;
16
17// Function to draw neutral (open) eyes on the OLED display
18void drawNeutralEyes() {
19  display.clearDisplay();
20  
21  // Draw left eye (outer circle and pupil)
22  display.drawCircle(40, 32, 10, SSD1306_WHITE);  // Outer circle
23  display.fillCircle(40, 32, 5, SSD1306_WHITE);   // Pupil
24  
25  // Draw right eye (outer circle and pupil)
26  display.drawCircle(88, 32, 10, SSD1306_WHITE);  // Outer circle
27  display.fillCircle(88, 32, 5, SSD1306_WHITE);   // Pupil
28  
29  display.display();  // Update the display to show the eyes
30}
31
32// Function to draw closed eyes (used for both blinking and sleep mode)
33void drawClosedEyes() {
34  display.clearDisplay();
35  
36  // Draw left closed eye (horizontal line)
37  display.drawLine(30, 32, 50, 32, SSD1306_WHITE);
38  
39  // Draw right closed eye (horizontal line)
40  display.drawLine(78, 32, 98, 32, SSD1306_WHITE);
41  
42  display.display();  // Update the display to show closed eyes
43}
44
45// Function to simulate a blinking effect
46void blink() {
47  drawClosedEyes();   // Show closed eyes to mimic blinking
48  delay(200);         // Brief delay to mimic blink duration
49  drawNeutralEyes();  // Return to open (neutral) eyes
50}
51
52void setup() {
53  // Initialize serial communication for debugging
54  Serial.begin(9600);
55  
56  // Initialize the OLED display
57  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
58    Serial.println(F("SSD1306 allocation failed")); // Error message if display initialization fails
59    for(;;);  // Halt program if initialization fails
60  }
61
62  // Set up the analog pin for input from the photoresistor
63  pinMode(ReadPin, INPUT);
64  
65}
66
67void loop() {
68  // Read the light level from the photoresistor
69  lightLevel = analogRead(ReadPin);
70  
71  // Check if the light level is above the threshold for study lighting
72  if (lightLevel > 650) {
73    blink();           // Show open and blinking eyes if lighting is adequate
74    delay(1500);       // Delay between blinks
75  } else {
76    drawClosedEyes();  // Show closed eyes if lighting is too low
77  }
78}