Desperate for help.(Beginner/Noob question)

Projects Programming
1

Hi, guys! I just started Arduino few days ago and I'm very into this so I need some help.
I wanted to create something from one place to another place for example: Enter "From 19 to 14".
Another example:
Start: 1
From: 1
To: 14
End: Serial.println('current position')
Here's what I did so far really desperate for help :(...

#include <WString.h>
#include <String.h>

byte mc[] = {1,2};
const byte constant[] = {3,3};
String x;
void setup()
{
Serial.begin(9600);
Serial.println("Startup");
}
void loop()
{
{
 if (Serial.available()>10)
 {
   x=Serial.read();
 }
}

 if(x.equals('1 to 2'))
 {
  int pos = (constant[1] - mc[1]);
  Serial.println('pos');
 }
 
 if(x.equals('2 to 2'))  //I'm not really sure if this works or not.. I'm trying to get as many different ways until I find one that works.
 {
  constant[2]-mc[1];
 }
}
2

You are using char sequences to compare numbers.

You need to use operands such as == and such

3

uh.. is it like that? still doesn't work sorry I'm pretty new to this.

#include <WString.h>
#include <String.h>

byte mc[] = {1,2};
const byte constant[] = {3,3};
String x;
void setup()
{
Serial.begin(9600);
Serial.println("Startup");
}
void loop()
{
{
 if (Serial.available()>10)
 {
   x=Serial.read();
 }
}

 if(x ==('1 to 2'))
 {
  int pos = (constant[1] - mc[1]);
  Serial.println('pos');
 }
 
 if(x ==('2 to 2'))  //I'm not really sure if this works or not.. I'm trying to get as many different ways until I find one that works.
 {
 int pos; pos<2;pos++;
 }
}
4

String x; is not valid, string x; is, C is case sensitive

if(x ==('1 to 2'))

change to

if(x == "1 to 2")

likewise

if(x ==('2 to 2'))

if(x =="2 to 2")

see what happens

even if it works its a pretty wasteful way to do it, but hey! whatever works for now until you get a grasp on the language

int pos; pos<2;pos++;

not sure whats going on there, what your looking for is something like

for(int pos; pos < 2; pos++)
{
do something
}

if I were a betting man you have knowledge of BASIC right? if so toss it out the window, there is only one language that works like BASIC

PS I am not even sure the above will fix all your issues, serial read, like every other known uart buffer in history fetches one charater at a time so to build a string out of single characters might be more of a pain in the butt than worth it. given the letters A-Z and numbers 0-9, gives you 36 unique values at a very simple level of understanding ... 0-9 = 1-10, A-Z= 11-26... something to think about, I have used it before (base 36) with great results.

5

String x; is not valid, string x; is, C is case sensitive

Yes, it is. But the Arduino doesn't have a string type or a string class. It does have a String class.

 if (Serial.available()>10)
 {
   x=Serial.read();
 }
}

If there are 10 ore more characters available to read, read one of them. How is that working for you? Never mind. I already know.

6

Thanks guys really appreciate for your help :)! are there any close thread buttons?

7

Edit your original post, add [ SOLVED ] to the thread title.