PIC BASIC USERS -- HELP!!

**Beefer3** · 1st February 2005 09:19 PM

All,
I am using PIC Basic and a keypad and would like to save the numbers and then output them as a whole decimal through RS232.

Example: On the keypad enter '1' then '0' then '0' and then press the ENT button to send out the whole number of 100 out serially to some device.

I am able to store the numbers individually (1 then 0 then 0)to the on board eeprom at different addresses but I am stuck as how to send the whole number of 100 out.

Any help is greatly appreciated. :lol:

Thanks

**bmcculla** · 2nd February 2005 01:38 AM

You should store the numbers in RAM in an array. When ENT is pressed you just read the numbers out of the array.

**Beefer3** · 2nd February 2005 02:13 AM

bmcculla
How do i go about doing this? My number that I want to send out may very from 0 to 200.

I have never really used RAM in pic basic before and I am at a loss...

If you don't mind, can you give me some example code or maybe explain it in detail for this feeble mind. :wink:

Thanks for any help you can give

**bmcculla** · 2nd February 2005 02:34 AM

I think I missunderstood what you were trying to do the first time; I don't think you need arrays for what you are talking about. I haven't used Basic in years but I can give you a start.

When you declare a variable it gets put in ram.

Here's some pseudo code:

Code:

BYTE Ser_Data;
BYTE Keypad_Input;
BYTE Key_Count;
Ser_Data = 0;
Key_Count = 0;
loop:
Keypad_Input = the data you read from the keypad;
if Keypad_Input equals ENT then
jump out of loop;
else
KeyCount + 1;
Ser_Data = Ser_Data + Key_Count*Keypad_Input;
jump to loop;

send Ser_Data with UART.

**Beefer3** · 2nd February 2005 01:31 PM

thanks bmcculla. I understand the psuedo code up until the ser_data part.
When you say

Code:

"Ser_Data = Ser_Data + Key_Count*Keypad_Input"

, wouldn't this just multiply the Key_Count value times Keypad_Input value?

Example: Let's say that my Key_Count value is 1 and my Key_Input value is 9. This value is 9 (1 * 9 = 9).

Now let's say I entered 4. My Key_Count value is 2 and my Key_Input is 4. This value is now 8 (2 * 4 = 8).

Now I have two values 9 and 8. Using the ser_data code above this would add the two together ( 9 + 8 = 17), correct?

This is not the number I want to send. I want to send the Key_Input values of 94.

Sorry to question your ways but am I way off course here?

Thanks

**lavenatti** · 2nd February 2005 01:53 PM

You could read the numbers from the keypad into an array.
When enter is pressed, use a few if-thens to determine how many numbers were entered and therefore a place value. Multiply the number x10 or x100 to give it it's real value then add all the entered numbers together

for example:
if you enter 4, 3, 5, <enter>
your array would have 4 values (if you included <enter>)
so...
multiply 4 x 100
multiply 3 x 10
5 is good the way it is.

Add them up 400 + 30 + 5
and send them out serially.

**bmcculla** · 2nd February 2005 07:23 PM

Sorry I wasn't thinking last night. Lavenetti has it right. The Ser_Data line was intended to multiply by the correct power of 10 but I forgot the exponentiation and was counting the wrong way with Key_Count. Just ignore my code and do what Lavenatti says.

**Beefer3** · 2nd February 2005 08:39 PM

Thanks guy. I will try the code tonight.

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