Keyestudio KS0077, Manual, Page: 28 / 142

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val=digitalRead(inpin);// read the level value of pin 7 and assign if to val
if(val==LOW)// check if the button is pressed, if yes, turn on the LED
{ digitalWrite(ledpin,LOW);}
else
{ digitalWrite(ledpin,HIGH);}
}
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Test Result
When the button is pressed, LED is on, otherwise, LED remains off. In this way, the button
controlled LED experiment is completed. The simple principle of this experiment is widely used
in a variety of circuit and electric appliances. You can easily come across it in your daily life. One
typical example is when you press a certain key on your phone, the backlight will be on.
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Project 7: Active Buzzer
Introduction
Active buzzer is widely used as a sound making element on computer, printer, alarm, electronic
toy, telephone, timer and more. It has an inner vibration source. Simply connect it with 5V power
supply, it can buzz continuously.