写一个适用于arduino mega的程序，用a，b，c三个红外接收器接收信号并计算它们的占空比，如果b接收到的信号的占空比等于a的，则输出LEFT；如果c接收到的信号的占空比等于a的，则输出RIGHT

以下是一个示例程序，使用三个红外接收器和一个Arduino Mega板，计算红外接收器的占空比并根据条件输出LEFT或RIGHT：

// 红外接收器的引脚定义
#define IR_PIN_A 2
#define IR_PIN_B 3
#define IR_PIN_C 4

// 定义红外接收器状态
volatile bool ir_state_a = false;
volatile bool ir_state_b = false;
volatile bool ir_state_c = false;

// 定义占空比变量
volatile unsigned long ir_high_time_a = 0;
volatile unsigned long ir_low_time_a = 0;
volatile unsigned long ir_high_time_b = 0;
volatile unsigned long ir_low_time_b = 0;
volatile unsigned long ir_high_time_c = 0;
volatile unsigned long ir_low_time_c = 0;

// 定义占空比比较值
const float COMPARE_VALUE = 0.1; // 10%

void setup() {
  // 初始化串口
  Serial.begin(9600);

  // 配置红外接收器引脚为输入
  pinMode(IR_PIN_A, INPUT);
  pinMode(IR_PIN_B, INPUT);
  pinMode(IR_PIN_C, INPUT);

  // 配置中断
  attachInterrupt(digitalPinToInterrupt(IR_PIN_A), ir_isr_a, CHANGE);
  attachInterrupt(digitalPinToInterrupt(IR_PIN_B), ir_isr_b, CHANGE);
  attachInterrupt(digitalPinToInterrupt(IR_PIN_C), ir_isr_c, CHANGE);
}

void loop() {
  // 计算占空比
  float ir_duty_cycle_a = (float)ir_high_time_a / (float)(ir_high_time_a + ir_low_time_a);
  float ir_duty_cycle_b = (float)ir_high_time_b / (float)(ir_high_time_b + ir_low_time_b);
  float ir_duty_cycle_c = (float)ir_high_time_c / (float)(ir_high_time_c + ir_low_time_c);

  // 判断占空比是否相等
  if (abs(ir_duty_cycle_b - ir_duty_cycle_a) < COMPARE_VALUE) {
    Serial.println("LEFT");
  } else if (abs(ir_duty_cycle_c - ir_duty_cycle_a) < COMPARE_VALUE) {
    Serial.println("RIGHT");
  }

  // 重置计数器
  ir_high_time_a = 0;
  ir_low_time_a = 0;
  ir_high_time_b = 0;
  ir_low_time_b = 0;
  ir_high_time_c = 0;
  ir_low_time_c = 0;

  // 延迟一段时间
  delay(50);
}

// 红外接收器A的中断服务程序
void ir_isr_a() {
  if (digitalRead(IR_PIN_A) == HIGH) {
    ir_high_time_a = micros();
  } else {
    ir_low_time_a = micros();
  }
}

// 红外接收器B的中断服务程序
void ir_isr_b() {
  if (digitalRead(IR_PIN_B) == HIGH) {
    ir_high_time_b = micros();
  } else {
    ir_low_time_b = micros();
  }
}

// 红外接收器C的中断服务程序
void ir_isr_c() {
  if (digitalRead(IR_PIN_C) == HIGH) {
    ir_high_time_c = micros();
  } else {
    ir_low_time_c = micros();
  }
}

请注意，此示例程序仅用于演示目的。您需要根据自己的硬件和需求进行适当的修改和调整。