Led (inglizcha: light-emitting diode, „yorituvchi diod ) bu yarimoʻtkazgichli yorugʻlik manbai boʻlib, tokni bevosita yorugʻlikka aylantiradi

Tugma yordamida jarayon tashkil etish

Ikki turdagi tugmalar mavjud, ular quyida keltirilgan:
YO'Q (Odatda ochiq)
Biz asosan NO turdagi tugmalardan foydalanamiz. Bunday turda tugma holati dam oladi. Bu shunday holatda terminal ulanmaganligini anglatadi.
U quyida ko'rsatilgan:



Tugmani bosganimizda, terminallar elektrga ulanadi.
NC (Odatda yopiq)
Bu tugmaning ish holati sifatida aniqlanadi. U kontaktlarning zanglashiga olib, oqimning yuk orqali o'tishiga imkon beradi.
U quyida ko'rsatilgan:

NC va NO kalitlarning vaqtinchalik turi sifatida ham aniqlanadi.
Amaliy qism:

1. 
   Led diodlar va tugma (button) yordamida quyidagi jarayyon tashkil qilindi. Jarayyon Tincercat muhitida amalga oshirildi. Ishda jarayyonni moshinaning avarenkalariga uxshatishga harakat qilindi yani tugma 1 marta bosilganda o’ng tarafga 2 marta bosilganda chap tarafga va 3 marta bosilganda umumiy o’chib yonish holatini ko’rishimiz mumkin.
   

1 – rasm: Jarayyon tashkil qilingan muhitning umumiy ko’rinishi
2 – rasm: Ishlash jarayyonidan

2. 
   Dasturning kodi quyidagicha yozilgan:
   

int lampPin2 = 2; // the PWM pin number of the first lamp
int lampPin3 = 3; // the PWM pin number of the second lamp
int lampPin4 = 4; // the PWM pin number of the third lamp
int buttonPin = 8; // the digital input pin number of the button
int buttonState = 0; // the state of the button (LOW or HIGH)


void setup() {
pinMode(lampPin2, OUTPUT); // set the first lamp pin as output for PWM
pinMode(lampPin3, OUTPUT); // set the second lamp pin as output for PWM
pinMode(lampPin4, OUTPUT); // set the third lamp pin as output for PWM
pinMode(buttonPin, INPUT); // set the button pin as input
}


void loop() {
buttonState = digitalRead(buttonPin); // read the state of the button
if (buttonState == HIGH) { // if the button is pressed
analogWrite(lampPin2, 255); // set the brightness of the first lamp to maximum
analogWrite(lampPin3, 255); // set the brightness of the second lamp to maximum
analogWrite(lampPin4, 255); // set the brightness of the third lamp to maximum
} else { // if the button is not pressed
analogWrite(lampPin2, 0); // set the brightness of the first lamp to minimum
analogWrite(lampPin3, 0); // set the brightness of the second lamp to minimum
analogWrite(lampPin4, 0); // set the brightness of the third lamp to minimum
}
}