Button Reads is there an easier way?

Projects Programming
1

Hello,
I don't really have a problem as this code is working fine but does someone know of an easier or less long winded way to implement these button reads, I have 8 Buttons wired through a resistor ladder to analog(0), one button is a shift button and because of the way the ladder is wired (all resistors in series) only one button can ever be pressed at once, so I have implimented a Boolean shift state to give each button a 2nd function, I've never really understood the "Case" keyword or if it will make any difference here,
Thanks in advance, Shaun

bool sState = 0;

void setup()
{
  Serial.begin(9600);
 }

void loop()
{
  int a = analogRead(0);
  if((a >= 370) && (a <= 372)) sState = 1;

  Serial.println(sState);

  if((a!=0) && sState == 1)
  {
    if((a >= 403) && (a <= 404))
    {
      Serial.println("F1");
      sState = 0;
    }
    if((a >= 441) && (a <= 442))
     {
      Serial.println("F2");
      sState = 0;
    }
    if((a >= 488) && (a <= 489))
    {
      Serial.println("F3");
      sState = 0;
    }
    if((a >= 545) && (a <= 546)) 
    {
      Serial.println("F4");
      sState = 0;
    }
    if((a >= 616) && (a <= 617)) 
    {
      Serial.println("F5");
      sState = 0;
    }
    if((a >= 711) && (a <= 712))
    {
      Serial.println("Info");
      sState = 0;
    }
    if((a >= 839) && (a <= 841))
    {
      Serial.println("Help");
      sState = 0;
    }
  }
  
  else
  
  {
    if((a >= 403) && (a <= 404)) Serial.println("ESC");
    if((a >= 441) && (a <= 442)) Serial.println("Left Arrow");
    if((a >= 488) && (a <= 489)) Serial.println("Right Arrow");
    if((a >= 545) && (a <= 546)) Serial.println("Enter");
    if((a >= 616) && (a <= 617)) Serial.println("PWR");
    if((a >= 711) && (a <= 712)) Serial.println("Down Arrow");
    if((a >= 839) && (a <= 841)) Serial.println("UP Arrow");
  }
  delay(100);
}
2

Arrays and data structures.

struct buttonRange{
  uint minVal, maxVal;
};

buttonRange myButtons[8];

Fill your myButtons array with the appropriate minMax for each button, then when you perform an analogRead, you can iterate through the array till you find the button that matches the read, ie:

int index = 8;
int a = analogRead(0);
do
{
  if(a >= myButtons[index].minVal && a <= myButtons[index].maxVal)
    break;
  index--;
}while(index>=0);

//At this point, index indicates which button was pushed, or -1 if no match was found

The struct could be expanded to contain the appropriate string data as well, at which point you could just do

if(index != -1) Serial.println(myButtons[index].text);

Disclaimer None of this code was compiled or tested. Any syntax or logic errors are up to the reader to debug and fix.