Arduino Project 011 - Piezo Sounder Alarm

Arduino project - sounder and sensors : Include project 11 Piezo Sounder Alarm ,Project piezo sounder Melody player , Project 13 Piezo knock sensor and Project 14 Light sensor.

电子编程--声音和传感器项目，主要包含以下几个项目，项目11 压电声音报警器，项目12 压电扬声器音乐演奏，项目13压电振动传感器，项目14光敏传感器。

By connecting a piezo sounder to a digital output pin, you can create a wailing alarm sound. It’s the same principle that you used in Project 7 when creating a pulsating lamp via a sine wave, but this time you replace the LED with a piezo sounder or piezo disc. 

项目 Project 11 – Piezo Sounder Alarm

/* Coding Ron Wang
   July 30th 2024
   Autaba support for coding hardware
 */
// Project 11 - Piezo Sounder Alarm
float sinVal;
int toneVal;
void setup() {
 pinMode(8, OUTPUT);
}
void loop() {
 for (int x=0; x<180; x++) {
 // convert degrees to radians then obtain sin value
 sinVal = (sin(x*(3.1412/180)));
 // generate a frequency from the sin value
 toneVal = 2000+(int(sinVal*1000));
 tone(8, toneVal);
 delay(2);
 }
}