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[on:]

Hi!
I have a keypad interfaced with a Arduino Mega.
This is what I want to do:
The user inputs a frequency value (say 100). The number is stored in memory as a variable and then used to output a wave at that frequency (this uses a separate section of codes - I have this part running).
However, I am having issues capturing the input and storing it. As in, if I punch in 1,0,0 it should record as 100; 5,0 as 50 etc. I read through the tutorials and the forum. http://arduino.cc/forum/index.php?topic=57627.0 was helpful in that matter. But I can have a single, double or triple digit input and cannot think of how to code for this.
I hope I was able to explain that well.
I need help with the logic! Please guide me!
Thanks!

[Reply #1 on:]

You need to have either a fixed terminating character, so you enter 5,0,# or 1,0,0,#, or you have to implement a timeout based routine. The fixed terminator is easiest to implement.

[Reply #2 on:]

Oh that seems a good idea! Will try coding and seeing if ti works! Thanx!

[Reply #3 on:]

Hi!

Does this make sense?

/Voltage - Functions to capture input, print on screen and store value//
//Voltage - Digit 1//
int GetVoltage1()
{
    int key = keypad.getKey();
    switch (key)
             {
                 case NO_KEY: break;
                 case '0': case '1': case '2': case '3': case '4':
                         case '5': case '6': case '7': case '8': case '9':
                              {
                                   lcd.print(key);
                                   key = digit1;
                                   break;
                              }
                    case '*':
                         {
                              voltage2();
                              break;
                         }
             }             
   return digit1;
}

//Voltage - Digit 2//
int GetVoltage2()
{
    int key = keypad.getKey();
    switch (key)
             {
                    case NO_KEY: break;
                    case '0': case '1': case '2': case '3': case '4':
                         case '5': case '6': case '7': case '8': case '9':
                              {
                                   lcd.print(key);
                                   key = digit2;
                                   break;
                              }
                    case '*':
                         {
                              voltage2();
                              break;
                         }
             }             
   }
   return digit2;
}

//Voltage - Digit 3//
int GetVoltage3()
{
    int key = keypad.getKey();
    switch (key)
             {
                    case NO_KEY: break;
                    case '0': case '1': case '2': case '3': case '4':
                         case '5': case '6': case '7': case '8': case '9':
                              {
                                   lcd.print(key);
                                   key = digit3;
                                   break;
                              }
                    case '*':
                         {
                              voltage2();
                              break;
                         }
             }             
   }
   return digit3;
}

//Voltage - Calculate Input//
int DutyCycle1 ()
{
    int input;
    input = (100*digit1)+(10*digit2)+(1*digit3);
    input = DutyCycle1;
    return DutyCycle1;
}

[Reply #4 on:]

Hi,

    I am new to the arduino world and would like to implyment a similar
method of storing multiple digits from a keypad on a Arduino UNO.

Is the posted code easily adjusted to run it on the UNO and display via
the serial monitor function.

kind regards

shaun

[Reply #5 on:]

Is the posted code easily adjusted to run it on the UNO and display via
the serial monitor function.

There really is no excuse for not just trying it.

[Reply #6 on:]

I've been looking for a solution for being able to enter multiple digit numbers and convert them into integer. I found a piece of code form PaulS but it does not work properly. Whatever number I enter with the delimiters I get '0' back on the serial monitor. The code:

Code:

char inData[10];
int index;
boolean started = false;
boolean ended = false;

void setup(){
  Serial.begin(9600);
  Serial.println("ready");
}

void loop()
{
  while(Serial.available() > 0)
  {
    char aChar = Serial.read();
    if(aChar == '>')
    {
      started = true;
      index = 0;
      inData[index] = '\0';
    }
    else if(aChar == '<')
    {
      ended = true;
    }
    else if(started)
    {
      inData[index] = aChar;
      index++;
      inData[index] = '\0';
    }
  }

  if(started && ended)
  {
    // Convert the string to an integer
    int inInt = atoi(inData);

    Serial.println(inInt);

    // Get ready for the next time
    started = false;
    ended = false;

    index = 0;
    inData[index] = '\0';
  }
}

[Reply #7 on:]

For instance if I enter <12345> I get zero back. What am I doing wrong?

[Reply #8 on:]

Add:

Code:

Serial.print("inData: [");
Serial.print(inData);
Serial.println("]");

after:

Code:

  if(started && ended)
  {

and show a screen shot of your serial monitor.

[Reply #9 on:]

This is what I get on the monitor if I enter an 8-digit number starting and finishing with the characters < and >:


inData: []
inData: []

[Reply #10 on:]

You are using > for the start of packet marker, and < for the end of packet marker.

Try sending >12345< and see what happens.

[Reply #11 on:]

Brilliant, thanks! It's working.