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Assistance with do-...
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Assistance with do-while loop

3 Posts
2 Users
Active Member
Joined: 3 years ago
Posts: 9
Topic starter  

I have a trouble, basically i have a code and i have to rewrite it with ''do'' and ''while''.

can somebody help me ? or atleast give some hints :D

It's basically about 3 leds and press button, for my school arduino project.

int buttonState = 0;

void setup()
pinMode(2, INPUT);
pinMode(8, OUTPUT);
pinMode(10, OUTPUT);
pinMode(9, OUTPUT);

void loop()
buttonState = digitalRead(2);
digitalWrite(8, HIGH);
digitalWrite(9, LOW);
if (buttonState == HIGH) {

for(int i=0; i<3;i=i+1){

digitalWrite(9, HIGH);
}// else {
// digitalWrite(8, HIGH);
// digitalWrite(9, LOW);
// digitalWrite(10, LOW);
// }

Famed Member Admin
Joined: 10 years ago
Posts: 2556

Can you explain what the code is supposed to be doing?

Note: it would be good to use constants/defines instead of absolute numbers. This way you can right away see what pin is used for what, and if that needs to be changed, then you can do that in just one spot. (example code blow - as you can see: it also improves readability)

#define BUTTON 2
#define LED1 8
#define LED2 9
#define LED3 10

void setup() { pinMode(BUTTON, INPUT); pinMode(LED1, OUTPUT); pinMode(LED2, OUTPUT); pinMode(LED3, OUTPUT); } void loop() { buttonState = digitalRead(BUTTON); digitalWrite(LED1, HIGH); digitalWrite(LED2, LOW); if (buttonState == HIGH) { digitalWrite(LED1,LOW); for(int i=0; i<3;i=i+1){ digitalWrite(LED3,HIGH); delay(3000); digitalWrite(LED3,LOW); delay(3000);
} digitalWrite(LED2, HIGH); delay(1000); }// else { // digitalWrite(LED1, HIGH); // digitalWrite(LED2, LOW); // digitalWrite(LED3, LOW); //
} }

 From what I'm reading in the code:

- LED1 on, LED2 off (LED3???)
- if BUTTON pressed then LED1 off, 2x LED3 on/off (3 seconds each).
- LED2 on
- Wait a second
- repeat

I'm not seeing where the do-while loop should be?

 Tip: I wrote a little intro to Arduino programming. There is a Do-While section here that explains the use of a do-while loop.

Active Member
Joined: 3 years ago
Posts: 9
Topic starter  

Hello, ill take look  intho that for sure, tnx :)


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