Input device

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              #define LED_PIN PIN_PA1

              void setup() {
                pinMode(LED_PIN, OUTPUT);
              }

              void loop() {
                digitalWrite(LED_PIN, HIGH);  // LED ON
                delay(1000);

                digitalWrite(LED_PIN, LOW);   // LED OFF
                delay(1000);
              }
               
            

              
                void setup() {
                Serial.begin(115200);
              }

              void loop() {
                Serial.println(analogRead(PIN_PA3));
                delay(200);
              }
               
            

              
              // Define the sensor is connected to pin PA3
              #define SENSOR_PIN PIN_PA3  

              void setup() {
                // Start serial communication at 115200 baud
                // also set the same value in serial monitor
                Serial.begin(115200);
              }


              // Function to get a stable sensor reading
              int readAverage() {
                int sum = 0;  // Variable to store total of readings

                // Take 10 readings to reduce noise
                for (int i = 0; i  < 10; i++) {
                // Read sensor and add to sum (like 920+940+.....)
                  sum += analogRead(SENSOR_PIN);  
                  delay(5);  
                }

                // Return the average value (total / number of readings)
                return sum / 10;
              }


              void loop() {

                // Call the function to get a smooth (averaged) sensor value
                int sensorValue = readAverage();

                // Print label to Serial Monitor
                Serial.print("Sensor: ");

                // Print the actual sensor value
                Serial.print(sensorValue);
                // for eg:  in serial monitor, it will show "Sensor:923"

                // Check if value is above threshold (990)
                // Threshold is chosen based on observed values
                if (sensorValue > 990) {
                  // If value is high :  object detected, it will print shade.
                  Serial.println(" shade");
                } else {
                  // If value is low: no object, it wil print sunlight.
                  Serial.println(" sunlight");
                }
            
                // Wait 200 milliseconds before next reading
                delay(200);
              } 
               
            

              
                #define SENSOR_PIN PIN_PA3
                #define IR_LED PIN_PA2

                void setup() {
                  Serial.begin(115200);
                  pinMode(IR_LED, OUTPUT);

                  digitalWrite(IR_LED, HIGH); // IR LED always ON

                  Serial.println("=== THRESHOLD TEST START ===");
                  Serial.println("Place AIR / WHITE / BLACK and observe values");
                }

                // Averaging for stable reading
                int readSensor() {
                  int sum = 0;
                  for (int i = 0; i < 30; i++) {
                    sum += analogRead(SENSOR_PIN);
                    delay(2);
                  }
                  return sum / 30;
                }

                void loop() {
                  int value = readSensor();

                  Serial.print("Sensor Value: ");
                  Serial.println(value);

                  delay(300);
                }
               
            

              
                if (value > 550) {
                  // NO CARD
                }
                else if (value < 250) {
                  // WHITE
                }
                else {
                  // BLACK
                }
               
            

              
              #define SENSOR_PIN PIN_PA3
              #define IR_LED PIN_PA2
              #define DEBUG_LED PIN_PA1

              void setup() {
                Serial.begin(115200);

                pinMode(IR_LED, OUTPUT);
                pinMode(DEBUG_LED, OUTPUT);

                digitalWrite(IR_LED, HIGH);
              }

              int readSensor() {
                int sum = 0;
                for (int i = 0; i < 20; i++) {
                  sum += analogRead(SENSOR_PIN);
                  delay(2);
                }
                return sum / 20;
              }

              void loop() {
                int value = readSensor();

                Serial.print("Value: ");
                Serial.print(value);

                // 🔴 NO CARD (AIR)
                if (value > 550) {
                  Serial.println(" → NO CARD");
                  digitalWrite(DEBUG_LED, LOW);
                }

                // ⚪ WHITE
                else if (value < 250) {
                  Serial.println(" → WHITE");
                  digitalWrite(DEBUG_LED, HIGH);
                }

                // ⚫ BLACK
                else {
                  Serial.println(" → BLACK");
                  digitalWrite(DEBUG_LED, LOW);
                }

                delay(100);
              }