3x4 keypad and 7 segments.

The_Apprentice

Hello everybody,

I need some help with my project. I'm planning to use a 3x4 keypad and a display with 2 7segments. The plan is to display in the 7segments the number what is press in the keypad.

If any body have any idea or tip I would really appreciate.

Thanks

T&E Engineer

You may want to look at the SX-28. They have an example showing how to do something very much like this using a 4x4 keypad and 7 segment display. I have modified it for an old radio shack 3x5 display which should help. It should also be possible to convert this into PBASIC. See attached.

Dave-W

Go to the Parallax site. Look at the code for the Stamp Works board. Lots of examples. Here is the seven segment part.

' ==============================================================================
'
' File...... Ex08 - SevenSegs.BS2
' Purpose... 7-Segment Display
' Author.... Parallax
' E-mail.... stamptech@parallaxinc.com
' Started...
' Updated... 01 MAY 2002
'
' {$STAMP BS2}
'
' ==============================================================================


'

---

' Program Description
'

---

' Displays digits on a 7-segment display.


'

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' I/O Definitions
'

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Segs VAR OUTL ' 7-segment LEDs


'

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' Constants
'

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Blank CON %00000000 ' clears the display


'

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' Variables
'

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counter VAR Nib


'

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' EEPROM Data
'

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' Segments .abcdefg
'

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DecDig DATA %01111110 ' 0
DATA %00110000 ' 1
DATA %01101101 ' 2
DATA %01111001 ' 3
DATA %00110011 ' 4
DATA %01011011 ' 5
DATA %01011111 ' 6
DATA %01110000 ' 7
DATA %01111111 ' 8
DATA %01111011 ' 9


'

---

' Initialization
'

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Initialize:
DIRL = %11111111 ' make segments outputs


'

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' Program Code
'

---

Main:
FOR counter = 0 TO 9 ' count
READ (DecDig + counter), Segs ' put 7-seg pattern on digit
PAUSE 1000 ' show for about one second
NEXT
GOTO Main ' do it all again

END

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D. A. Wreski