Arduino UNO：除了光检查器之外一切正常

Question

这是一个简单的 Arduino UNO 项目，可以使用按钮或光传感器打开和关闭 LED 灯。 按钮工作正常，可以毫无问题地打开和关闭 LED 灯。光传感器也工作了，我调试了一下，它可以检测到光。我的问题是，即使光照水平 (>400) 超过阈值 (400)，它仍然不会打开或关闭 LED，就像没有效果一样。 （带光500-700）。 这是我的 Arduino 图表。 （绿线为光传感器）Arduino 图

这是我的代码。

int ledPin = 13;        // LED connected to digital pin 13
int lightSensorPin = A0;  // Photoresistor connected to analog pin A0
int btnPin = 2;         // Button connected to digital pin 2
int threshold = 400;    // Light level threshold (adjust based on your sensor and environment)

int state = LOW;        // Current state of the LED

void setup() {
  pinMode(ledPin, OUTPUT);       // Set the LED pin as an output
  pinMode(btnPin, INPUT_PULLUP); // Set the button pin as input with an internal pull-up resistor
  Serial.begin(9600);            // Initialize serial communication for debugging
}

void loop() {
  int lightLevel = analogRead(lightSensorPin);  // Read the light sensor value
  int buttonState = digitalRead(btnPin);        // Read the button state

  // Debugging: Print the light sensor value and button state
  Serial.print("Light Level: ");
  Serial.print(lightLevel);
  Serial.print(" | Button State: ");
  Serial.println(buttonState);

  // Toggle LED state when button is pressed
  if (buttonState == LOW) {  // Button pressed (active LOW)
    delay(50);  // Debounce delay
    if (digitalRead(btnPin) == LOW) {  // Confirm button is still pressed
      state = !state;  // Toggle the state
      digitalWrite(ledPin, state);  // Update the LED
      while (digitalRead(btnPin) == LOW) {
        // Wait for button release to avoid multiple toggles
      }
    }
  }
  else {
    // Control LED based on light sensor only if the button is not pressed
    if (lightLevel < threshold) {
      digitalWrite(ledPin, LOW);   // Turn on the LED if light level is below the threshold
    } else {
      digitalWrite(ledPin, HIGH);  // Turn off the LED if light level is above the threshold
    }
  }

  delay(100);  // Small delay to smooth the sensor readings
}

Answer 1

我已经在 Arduino Uno 上运行了您的代码，并按您所连接的按钮，并用电位计代替了 LDR。当我转动电位计使模拟读数超过 400 值时，LED 也会相应地切换。所以你的代码可以工作。

为了更好地了解正在发生的情况，您可以编辑代码，以便获得更接近您使用该值的位置的串行端口的模拟读数。所以试试这个：

int ledPin = 13;        // LED connected to digital pin 13
int lightSensorPin = A0;  // Photoresistor connected to analog pin A0
int btnPin = 2;         // Button connected to digital pin 2
int threshold = 400;    // Light level threshold (adjust based on your sensor and environment)

int state = LOW;        // Current state of the LED

void setup() {
  pinMode(ledPin, OUTPUT);       // Set the LED pin as an output
  pinMode(btnPin, INPUT_PULLUP); // Set the button pin as input with an internal pull-up resistor
  Serial.begin(9600);            // Initialize serial communication for debugging
}

void loop() {
  int lightLevel = analogRead(lightSensorPin);  // Read the light sensor value
  int buttonState = digitalRead(btnPin);        // Read the button state
/*
  // Debugging: Print the light sensor value and button state
  Serial.print("Light Level: ");
  Serial.print(lightLevel);
  Serial.print(" | Button State: ");
  Serial.println(buttonState);
*/
  // Toggle LED state when button is pressed
  if (buttonState == LOW) {  // Button pressed (active LOW)
    delay(50);  // Debounce delay
    if (digitalRead(btnPin) == LOW) {  // Confirm button is still pressed
      state = !state;  // Toggle the state
      digitalWrite(ledPin, state);  // Update the LED
      while (digitalRead(btnPin) == LOW) {
        // Wait for button release to avoid multiple toggles
      }
    }
  }
  else {
    lightLevel = analogRead(lightSensorPin);
    Serial.print("Light Level: ");
    Serial.println(lightLevel);  //note I am using println here
    
    // Control LED based on light sensor only if the button is not pressed
    if (lightLevel < threshold) {
      digitalWrite(ledPin, LOW);   // Turn on the LED if light level is below the threshold
    } else {
      digitalWrite(ledPin, HIGH);  // Turn off the LED if light level is above the threshold
    }
  }

  delay(100);  // Small delay to smooth the sensor readings
}

我还注释掉了发送到串行端口的其他代码，以澄清发生了什么。

当您更改灯光级别时，您应该看到值转变为 400 级别，如通过串行监视器报告的那样。此时您应该会看到 LED 状态发生变化。

如果您看到串行读数，则 LED 不可能无法更改状态。如果您没有看到串行读数，则一定是 (buttonState == LOW) 条件阻止代码到达 LDR 部分。