Example Code for Arduino-Slow Detection Mode

Code function: recognize the 9 basic gestures and 4 expanded gestures in slow mode.

The default sampling time in slow mode is 2 seconds. Please wait about 1 second between gesture detections.

The available gestures in slow detection mode:

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• IO Expansion Shield x1
• Gravity: PAJ7620U2 Gesture Sensor

Software Preparation

• Arduino IDE
• Download and install the PAJ7620U2 Example Library. (About how to install the library?)

Wiring Diagram

Sample Code

#include <DFRobot_PAJ7620U2.h>
 
/*!
 * @file GestureRecognize_LowRate.ino
 * @brief Present the 9 built-in gestures the sensor supports and 4 extended gestures in the slow mode.  
 * @n Wave you hand above the sensor(within 0~20cm), it can detect: move left, right, up, down, forward, backward, clockwise, 
 * @n anti-clockwise, wave, slowly move left and right, slowly move up and down, slowly move forward and backward, wave randomly and slowly.
 * @n For more usages of the sensor, refer to the description about setGestureLowRate in function setup.  
 *
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author      Alexander([email protected])
 * @version  V1.0
 * @date  2019-07-16
 * @get from https://www.dfrobot.com
 * @url https://github.com/DFRobot/DFRobot_PAJ7620U2
 */
 
#include <DFRobot_PAJ7620U2.h>

DFRobot_PAJ7620U2 paj;

void setup()
{
  Serial.begin(115200);
  delay(300);
  Serial.println("Gesture recognition system base on PAJ7620U2");
  while(paj.begin() != 0){
    Serial.println("initial PAJ7620U2 failure! Please check if all the connections are fine, or if the wire sequence is correct?");
    delay(500);
  }
  Serial.println("PAJ7620U2init completed, start to test the gesture recognition function");
  
  /*Set fast detection mode 
   *If the parameter is set to false, the module enters slow detection mode, and it detects one gesture every 2s. We have integrated 
   *some gestures inside the module to make it convenient for beginners.
   *The slow mode can recognize 9  basic gestures and 4 expanded gestures: move left, right, up, down, forward, backward, clockwise, 
   *counter-clockwise, wave, slowly move left and right, slowly move up and down, slowly move forward and backward,
   *wave slowly and randomly. 
   *
   *
   *
   *If the parameter is set to true, the module enters fast detection mode. 
   *The fast mode can recognize 9 gestures: move left, right, up, down, forward, backward, clockwise, counter-clockwise, wave.
   *To detect the combination of these gestures, like wave left, right and left quickly, users needs to design their own
   *algorithms logic.
   *Since users only use limited gestures in this mode, we are not going to integrate too much expanded gestures in the library.
   *If necessary, you can complete the algorithm logic in the ino file by yourself.
   */
  paj.setGestureHighRate(false);

}

void loop()
{
  /* Read gesture number（return eGesture_t enumerated type）
   * eGestureNone  eGestureRight  eGestureLeft  eGestureUp  eGestureDown  eGestureForward
   * eGestureBackward  eGestureClockwise  eGestureAntiClockwise  eGestureWave  eGestureWaveSlowlyDisorder
   * eGestureWaveSlowlyLeftRight  eGestureWaveSlowlyUpDown  eGestureWaveSlowlyForwardBackward
   */
  DFRobot_PAJ7620U2::eGesture_t gesture = paj.getGesture();
  if(gesture != paj.eGestureNone ){
   /* Get the string descritpion corresponding to the gesture number.
    * The string description could be 
    * "None","Right","Left", "Up", "Down", "Forward", "Backward", "Clockwise", "Anti-Clockwise", "Wave",
    * "WaveSlowlyDisorder", "WaveSlowlyLeftRight", "WaveSlowlyUpDown", "WaveSlowlyForwardBackward"
    */
    String description  = paj.gestureDescription(gesture);//Convert gesture number into string description
    Serial.println("--------------Gesture Recognition System---------------------------");
    Serial.print("gesture code        = ");Serial.println(gesture);
    Serial.print("gesture description  = ");Serial.println(description);
    Serial.println();
  }
}

Result

Serial print the code and description of 13 gestures: