#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Keypad.h>
#include <ESP32Servo.h>
// OLED Settings
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
// Servo Settings
Servo myServo;
const int servoPin = 33;
// Keypad Setup
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {19, 18, 5, 17};
byte colPins[COLS] = {16, 4, 0, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
// Credentials
String targetID = "123";
String targetPass = "ABC";
String inputBuffer = "";
bool isEnteringPass = false;
void updateOLED(String topMsg, String bottomMsg, bool isSecret = false) {
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0, 5);
display.println(topMsg);
display.setTextSize(2);
display.setCursor(0, 30);
if(isSecret) {
String masked = "";
for(int i=0; i<bottomMsg.length(); i++) masked += "*";
display.println(masked);
} else {
display.println(bottomMsg);
}
display.display();
}
void setup() {
Serial.begin(115200);
myServo.attach(servoPin);
myServo.write(0); // Door Closed
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("Display failed");
for(;;);
}
updateOLED("SYSTEM LOCKED", "Enter ID:");
}
void loop() {
char key = keypad.getKey();
if (key) {
Serial.print("Pressed: "); Serial.println(key);
if (key == '#') { // Action: Enter/Confirm
if (!isEnteringPass) {
if (inputBuffer == targetID) {
isEnteringPass = true;
inputBuffer = "";
updateOLED("ID VERIFIED", "Enter PASS:");
} else {
updateOLED("INVALID ID", "Try Again:");
inputBuffer = "";
}
} else {
if (inputBuffer == targetPass) {
updateOLED("ACCESS GRANTED", "OPENING...");
myServo.write(90); // Open glass
delay(5000); // Wait 5 seconds
myServo.write(0); // Close glass
isEnteringPass = false;
inputBuffer = "";
updateOLED("LOCKED", "Enter ID:");
} else {
updateOLED("WRONG PASS", "Enter PASS:");
inputBuffer = "";
}
}
}
else if (key == '*') { // Action: Clear
inputBuffer = "";
updateOLED(isEnteringPass ? "Enter PASS:" : "Enter ID:", "");
}
else { // Append numbers or letters (A, B, C)
inputBuffer += key;
updateOLED(isEnteringPass ? "Enter PASS:" : "Enter ID:", inputBuffer, isEnteringPass);
}
delay(100); // Debounce delay
}
}