Arduino new-man gogogo!

Using Arduino LEDs and Multiplexing
1

The first day of learning punch assignments!
I don't know how to sending photos and videos, so I will go to study and discuss with you!
690x388

2

Do you have a question?

1 Like
3

Hi, how do you wanna send photos and videos? With Raspberry PI, ESP32 or any other platform?

1 Like
4

Please don't send videos. It's last resort. It forces people to decide whether they have the time to sit through the whole thing.

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5

yes!I have many question.I don't know how to say it. Let me try to describe them.The one is about'Knight-rider'Which is one of my homework.Is like Running back and forth light.The first code I wrote didn't work. I had to go in one direction, not back and forth.

void setup() {
// put your setup code here, to run once:
int i;
for(i=8;i<=13;i++);{
pinMode(i,OUTPUT);
}
}
void loop() {
// put your main code here, to run repeatedly:
F1();
delay(1000);
F2();
delay(1000);

}
void F1()
{
int i;
for(i=8;i<=13;i++);
{
digitalWrite(i,HIGH);
delay(200);
}
for(i=13;i>=8;i--)
{
digitalWrite(i,LOW);
delay(200);
}
}
void F2()
{
int i;
for(i=13;i>=8;i--)
{
digitalWrite(i,HIGH);
delay(200);
}
for(i=8;i<=13;i++);
{
digitalWrite(i,LOW);
delay(200);
}

}

This is my first attempt at programming, which failed. This program doesn't do round-trip repetition, and I don't know what's wrong with it.

Then I went online and found other bloggers' codes, and it worked. But I can't understand one of them. I would really appreciate it if you could give me a solution.

int startPin=8;
int endPin=13;
int j=0;
void setup() {
// put your setup code here, to run once:
for (int i=startPin;i<=endPin;i++){
pinMode(i,OUTPUT);
}
}

void loop() {
// put your main code here, to run repeatedly:
for(int i=startPin;i<=endPin;i++){
digitalWrite(i,LOW);
}
digitalWrite(startPin+j,HIGH);
j=(j+1)%(endPin-startPin+1);
delay(100);
}

I don't quite understand these lines in this set of code：
digitalWrite(startPin+j,HIGH);
j=(j+1)%(endPin-startPin+1);

Thanks for your reply anyway! You're the first person I've met on this site. Nice to meet you!

6

Use Google translate.

Notice how your code looks like garbage on the screen? It's because you didn't use code tags around the text.

1 Like
7

I'm sorry that my English is not good enough to understand what you mean.But thank you for your reply！Nice to meet you

8

https://translate.google.com/

1 Like
9

I'm sorry! This is the first time I've sent code. Is there any format requirement?

10

Tust arduino!thank you for your reply.

11

Yes, it makes it post like this:

void loop() {
// put your main code here, to run repeatedly:
for(int i=startPin;i<=endPin;i++){
digitalWrite(i,LOW);
}
digitalWrite(startPin+j,HIGH);
j=(j+1)%(endPin-startPin+1);
delay(100);
}
1 Like
12

Wow!it is looks nice. How can I do this?

13

before_adding_code_tags

1 Like
14

I got it！Respect!And Thank you!

void setup() {
  // put your setup code here, to run once:
int I;
for(i=8;i<=13;i++);{
  pinMode(i,OUTPUT);
}
}
void loop() {
  // put your main code here, to run repeatedly:
F1();
delay(1000);
F2();
delay(1000);

}
void F1()
{
int I;
  for(i=8;i<=13;i++);
  {
    digitalWrite(i,HIGH);
    delay(200);
  }
  for(i=13;i>=8;i--)
   {
    digitalWrite(i,LOW);
    delay(200);
  }
}
void F2()
{
  int I;
   for(i=13;i>=8;i--)
   {
    digitalWrite(i,HIGH);
    delay(200);
  }
   for(i=8;i<=13;i++);
  {
    digitalWrite(i,LOW);
    delay(200);
  }
 
}
15

That doesn't compile. C++ is case sensitive so I is not the same as i.

17

Did you have some question?

18

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