解释下列Arduino代码 #include <Wire.h> #include "paj7620.h" /* Notice: When you want to recognize the Forward/Backward gestures, your gestures' reaction time must less than GES_ENTRY_TIME(0.8s). You also can adjust the reaction time according to the actual circumstance. */ #define GES_REACTION_TIME 500 // You can adjust the reaction time according to the actual circumstance. #define GES_ENTRY_TIME 800 // When you want to recognize the Forward/Backward gestures, your gestures' reaction time must less than GES_ENTRY_TIME(0.8s). #define GES_QUIT_TIME 1000 void setup() { uint8_t error = 0; Serial.begin(9600); Serial.println("\nPAJ7620U2 TEST DEMO: Recognize 9 gestures."); error = paj7620Init(); // initialize Paj7620 registers if (error) { Serial.print("INIT ERROR,CODE:"); Serial.println(error); } else { Serial.println("INIT OK"); } Serial.println("Please input your gestures:\n"); } void loop() { uint8_t data = 0, data1 = 0, error; error = paj7620ReadReg(0x43, 1, &data); // Read Bank_0_Reg_0x43/0x44 for gesture result. if (!error) { switch (data) { // When different gestures be detected, the variable 'data' will be set to different values by paj7620ReadReg(0x43, 1, &data). case GES_RIGHT_FLAG: delay(GES_ENTRY_TIME); paj7620ReadReg(0x43, 1, &data); if (data == GES_FORWARD_FLAG) { Serial.println("Forward"); delay(GES_QUIT_TIME); } else if (data == GES_BACKWARD_FLAG) { Serial.println("Backward"); delay(GES_QUIT_TIME); } else { Serial.println("Right"); } break; case GES_LEFT_FLAG: delay(GES_ENTRY_TIME); paj7620ReadReg(0x43, 1, &data); if (data == GES_FORWARD_FLAG) { Serial.println("Forward"); delay(GES_QUIT_TIME); } else if (data == GES_BACKWARD_FLAG) { Serial.println("Backward"); delay(GES_QUIT_TIME); } else { Serial.println("Left"); } break; case GES_UP_FLAG: delay(GES_ENTRY_TIME); paj7620ReadReg(0x43, 1, &data); if (data == GES_FORWARD_FLAG) { Serial.println("Forward"); delay(GES_QUIT_TIME); } else if (data == GES_BACKWARD_FLAG) { Serial.println("Backward"); delay(GES_QUIT_TIME); } else { Serial.println("Up"); } break; case GES_DOWN_FLAG: delay(GES_ENTRY_TIME); paj7620ReadReg(0x43, 1, &data); if (data == GES_FORWARD_FLAG) { Serial.println("Forward"); delay(GES_QUIT_TIME); } else if (data == GES_BACKWARD_FLAG) { Serial.println("Backward"); delay(GES_QUIT_TIME); } else { Serial.println("Down"); } break; case GES_FORWARD_FLAG: Serial.println("Forward"); delay(GES_QUIT_TIME); break; case GES_BACKWARD_FLAG: Serial.println("Backward"); delay(GES_QUIT_TIME); break; case GES_CLOCKWISE_FLAG: Serial.println("Clockwise"); break; case GES_COUNT_CLOCKWISE_FLAG: Serial.println("anti-clockwise"); break; default: paj7620ReadReg(0x44, 1, &data1); if (data1 == GES_WAVE_FLAG) { Serial.println("wave"); } break; } } delay(100); }

这是用于PAJ7620手势识别传感器的Arduino代码。代码包括设置传感器，读取手势数据，识别不同手势并输出相应的消息。其中，GESTURE_REACTION_TIME、GESTURE_ENTRY_TIME和GESTURE_QUIT_TIME是预定义的参数，用于确定手势识别的时间。代码主要的loop函数是通过读取0x43寄存器获取手势的结果，并根据手势的类型以不同的方式响应。当检测到前/后手势时，用户的反应时间必须小于GESTURE_ENTRY_TIME（0.8秒），否则不会被识别。在每次循环最后，有一个100毫秒的延迟。