使用 BLE shield 读取时 RGB LED 不工作

Question

我有一个 BLE shield + Arduino UNO，它已连接并与我的 IOS 设备一起工作。我还想做的就是用 RGB LED 显示屏蔽的连接状态。

我正在使用以下代码，但不知何故，即使在调用函数时我也看不到颜色变化。

int redPin = 13;
int greenPin = 12;
int bluePin = 11;
void setup()
{
    pinMode(redPin, OUTPUT);
    pinMode(greenPin, OUTPUT);
    pinMode(bluePin, OUTPUT);

    // Init. and start BLE library.
    ble_begin();

    // Enable serial debug
    Serial.begin(57600);
}

void loop()
{

    Serial.println("Inside loop");
    if ( ble_connected() )
    {
        setColor(200, 200, 200);
        int sensorValue = analogRead(A0);
        //Some code to write stuffs
    }



    ble_do_events();
delay(2000);
}

void setColor(int red, int green, int blue)
{
  #ifdef COMMON_ANODE
    red = 255 - red;
    green = 255 - green;
    blue = 255 - blue;
  #endif
  Serial.println("Inside setcolor");
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);  
}

当我在没有 BLE 的情况下单独执行时，LED 代码工作正常。下面的代码将起作用。同样的东西放在上面是行不通的。

int redPin = 13;
int greenPin = 12;
int bluePin = 11;

void setup()
{
 pinMode(redPin, OUTPUT);
    pinMode(greenPin, OUTPUT);
    pinMode(bluePin, OUTPUT);
}

void loop()
{
setColor(20, 20, 20);
 delay(2000);
}

void setColor(int red, int green, int blue)
{
  #ifdef COMMON_ANODE
    red = 255 - red;
    green = 255 - green;
    blue = 255 - blue;
  #endif
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);  
}

这是什么原因？它与 AnalogRead 和 AnalogWrite 有什么关系吗？ TIA

Answer 1

正如 OP 所问，这里是答案。

问题是 Arduino UNO 在引脚 12 和 13 上没有 PWM，所以这些引脚上的 analogWrite 什么都不做。

根据 Arduino 文档 (here)，"On most Arduino boards (those with the ATmega168 or ATmega328), this function works on pins 3, 5, 6, 9, 10, and 11"。因此，更改 R 和 G 引脚解决了问题。

使用 BLE shield 读取时 RGB LED 不工作

RGB LED won't work when reading with BLE shield

arduino

arduino-uno