KEY Control Buzzer

The buzzer sound is controlled by controlling the button (K1) on the Robduino expansion board.

Device connection

Hardware connection

Use Type-B data cable to connect Arduino Uno and computer.

Software connection

Open the "Arduino IDE" software and select the model and serial port number corresponding to the development board.

Button control RGB

Control principle

Associate the button state with the buzzer, and switch the buzzer state by pressing and releasing the button.

Control pin

Code analysis

Here is only a brief introduction to the code content. For detailed code, please refer to the corresponding code file, which is provided in the download area!

• Define control pins, button status and buzzer status

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// 定义按键引脚和控制状态 Define pin and key(button) states
#define BUZZER_PIN 10
bool bBuzzerState = false;

// 定义按键引脚和控制状态 Define pin and key(button) states
#define KEY_PIN 7
#define Press_KEY 0
#define Release_KEY 1

• Button detection

Note: This method will only respond to the button being pressed when the button is released, that is, it will only return to the pressed state once it is pressed and released!

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/**
 * @brief 获取按键状态 Get key(button) status
 * @param pin: 按键控制引脚 Control key(button) pins
 * @retval 按键状态 Key(button) Status
 */
int getKeyState(uint8_t pin) {
  if (digitalRead(pin) == LOW) {
    delay(20);
    if (digitalRead(pin) == LOW) {
      while (digitalRead(pin) == LOW)
        ;
      return Press_KEY;
    }
    return Release_KEY;
  } else {
    return Release_KEY;
  }
}

• Initialization Code

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void setup() {
  pinMode(KEY_PIN, INPUT_PULLUP);  // 设置按键KEY引脚上拉输入模式 Set the key(button) pin to pull-up input mode
  pinMode(BUZZER_PIN, OUTPUT);     // 设置蜂鸣器引脚输出模式 Set the buzzer pin output mode
}

• Looping code

 KEY Control RGB
Serial Parse Data