Electronics Projects

void loop() {
  if (gestureDetected) {
    gestureDetected = false;
    DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();

    if (gesture != paj.eGestureNone) {
      switch (gesture) {
        case 1:
          Serial.println("RIGHT");
          break;
        case 2:
          Serial.println("LEFT");
          break;
        case 4:
          Serial.println("UP");
          break;
        case 8:
          Serial.println("DOWN");
          break;
        case 16:
          Serial.println("FORWARD");
          break;
        case 32:
          Serial.println("BACKWARD");
          break;
        case 64:
          Serial.println("CLOCKWISE");
          break;
        case 128:
          Serial.println("ANTI-CLOCKWISE");
          break;
        case 256:
          Serial.println("WAVE");
          break;
        case 512:
          Serial.println("SLOW WAVE - DISORDER");
          break;
        case 3:
          Serial.println("SLOW WAVE - LEFT-RIGHT");
          break;
        case 12:
          Serial.println("SLOW WAVE - UP-DOWN");
          break;
        case 48:
          Serial.println("SLOW WAVE - FORWARD-BACKWARD");
          break;
        default:
          Serial.println("New Gesture");
          break;
      }
    }
  }
}

• if (gestureDetected): This condition checks if the gestureDetected flag is true, indicating that a gesture has been detected by the sensor. If a gesture is detected, the code inside the block is executed. If not, it simply skips to the next iteration of the loop.

• gestureDetected = false;: After detecting a gesture, this line resets the gestureDetected flag back to false so the program is ready to detect the next gesture. This ensures that gestures are only processed once.

• DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();: This line calls the getGesture() method from the paj object to retrieve the type of gesture detected. The result is stored in the gesture variable, which can be one of several predefined gestures.

• if (gesture != paj.eGestureNone): This checks if the gesture is not eGestureNone, which means a valid gesture was detected. If no gesture was detected, it skips the switch statement.

• switch (gesture): The switch statement evaluates the value of the gesture variable, which contains a number corresponding to a specific gesture. Based on the gesture detected, a different case is executed.

• case 1: through case 48:: Each case corresponds to a specific gesture. For example:

  • • case 1: is for a "RIGHT" gesture.
    • case 2: is for a "LEFT" gesture.
    • And so on for all possible gestures like "UP", "DOWN", "FORWARD", "BACKWARD", and more.
  • For each recognized gesture, the program prints the corresponding gesture description (e.g., "RIGHT", "LEFT", etc.) to the Serial Monitor.

   

• default:: If the detected gesture doesn't match any of the predefined cases, the default case is executed. It prints "New Gesture" to the Serial Monitor, indicating that an unrecognized gesture was detected.

Code For Arduino GY-PAJ7620 Gesture Sensor Interfacing:

#include <DFRobot_PAJ7620U2.h>
#include <Wire.h>

#define GESTURE_INT_PIN 2

DFRobot_PAJ7620U2 paj;
volatile bool gestureDetected = false;

void gestureInterrupt() {
  gestureDetected = true;
}

void setup() {
  Serial.begin(9600);
  delay(300);

  while (paj.begin() != 0) {
    delay(500);
  }

  paj.setGestureHighRate(false);

  pinMode(GESTURE_INT_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(GESTURE_INT_PIN), gestureInterrupt, FALLING);
}

void loop() {
  if (gestureDetected) {
    gestureDetected = false;
    DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();

    if (gesture != paj.eGestureNone) {
      switch (gesture) {
        case 1:
          Serial.println("RIGHT");
          break;
        case 2:
          Serial.println("LEFT");
          break;
        case 4:
          Serial.println("UP");
          break;
        case 8:
          Serial.println("DOWN");
          break;
        case 16:
          Serial.println("FORWARD");
          break;
        case 32:
          Serial.println("BACKWARD");
          break;
        case 64:
          Serial.println("CLOCKWISE");
          break;
        case 128:
          Serial.println("ANTI-CLOCKWISE");
          break;
        case 256:
          Serial.println("WAVE");
          break;
        case 512:
          Serial.println("SLOW WAVE - DISORDER");
          break;
        case 3:
          Serial.println("SLOW WAVE - LEFT-RIGHT");
          break;
        case 12:
          Serial.println("SLOW WAVE - UP-DOWN");
          break;
        case 48:
          Serial.println("SLOW WAVE - FORWARD-BACKWARD");
          break;
        default:
          Serial.println("New Gesture");
          break;
      }
    }
  }
}

Video