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Can someone help with this? I need to interface a 4x4 matrix keypad to a basicx and output this as 8-bit BCD. Also is there a way to do key mapping? At present Im using a Fairchild keypad decoder IC or this project but the problem is it wont allow me to assign the rows and colums to the output I would like "row 1 col 4 on the keypad is A but the chip sees it as 4" Any help would be great Jason

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Hi Jason! You should be able to translate the bytes sent from the keypad chip pretty easily. Assuming the byte in a sharacter, you setup two strings, one for the values returned by the keypad, one for the values you want. like this: src = "0123456789ABCDEF" dst = "5678ABCD012349EF" Rslt = Mid(dst,Instr(src,KeyPadChar),1) (not tested on BX24) This assumes that the character from the keypad is in KeyPadChar, and the result is put into Rslt. In the example above, a "4" from the keypad would become "A", a "0" from the keypad would become "5", and so on. If it's returning a byte value of 4 instead of an ASCII "4", you could build your character string like: src = chr(0) + chr(1) + chr(2) + chr(3) + chr(4) + ... etc... In any case, check the syntax on the BX24 first, but the idea above should work. Sloan ----- Original Message ----- From: "jasongarbus" <> To: <> Sent: Monday, April 14, 2003 7:29 PM Subject: [BasicX] Matrix Keypad Interface > Can someone help with this? I need to interface a 4x4 matrix keypad > to a basicx and output this as 8-bit BCD. Also is there a way to do > key mapping? At present Im using a Fairchild keypad decoder IC or > this project but the problem is it wont allow me to assign the rows > and colums to the output I would like "row 1 col 4 on the keypad is A > but the chip sees it as 4" Any help would be great > > Jason

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Since your going to be interfacing with a keypad then your going to want to see the digits as you enter them. Matrix Orbital sells a Serial LCD with a keypad interface. The device works well and you can communicate with it via a 232 or I2c interface. I currently have two projects that use the LCD with an I2c interface (one with a BX24 and one with a PIC16f84). The LK162 has a 12 key interface (4 col X 3 row) and a 2 x 16 display. I uploaded code that includes the keypad translation stuff a long time ago. I think it's listed in the file section under "Protense code". I just checked their website and they have some that will do 25 keys. (www.matrixorbital.com/products/lk202-25.htm) Let me know if you want any more details. Harry -----Original Message----- From: jasongarbus [mailto:] Sent: Monday, April 14, 2003 7:29 PM To: Subject: [BasicX] Matrix Keypad Interface Can someone help with this? I need to interface a 4x4 matrix keypad to a basicx and output this as 8-bit BCD. Also is there a way to do key mapping? At present Im using a Fairchild keypad decoder IC or this project but the problem is it wont allow me to assign the rows and colums to the output I would like "row 1 col 4 on the keypad is A but the chip sees it as 4" Any help would be great Jason [Non-text portions of this message have been removed]

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Aside from external 3rd party hardware like chips and the matrix orbital (nice but expensive) you might want to look at this: Reading buttons and switches http://www.basicx.com/Products/BX-24/Code_Examples/Buttons_BX24.zip Reading a 4x4 matrix keypad http://www.basicx.com/Products/BX-24/Code_Examples/Keypad_BX24.zip -- Doug

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If I use the I2c bus how far can I run it? The BCD was going to run over some distance but I could modify the project. If I cant ust the I2c bus maybe 485????not sure now. Thanks --- In , "Harry J. White" <hwhite@d...> wrote: > Since your going to be interfacing with a keypad then your going to want to > see the digits as you enter them. Matrix Orbital sells a Serial LCD with a > keypad interface. The device works well and you can communicate with it via > a 232 or I2c interface. I currently have two projects that use the LCD with > an I2c interface (one with a BX24 and one with a PIC16f84). The LK162 has a > 12 key interface (4 col X 3 row) and a 2 x 16 display. I uploaded code that > includes the keypad translation stuff a long time ago. I think it's listed > in the file section under "Protense code". I just checked their website and > they have some that will do 25 keys. > (www.matrixorbital.com/products/lk202-25.htm) > Let me know if you want any more details. > Harry > > -----Original Message----- > From: jasongarbus [mailto:jasongarbus@y...] > Sent: Monday, April 14, 2003 7:29 PM > To: > Subject: [BasicX] Matrix Keypad Interface > Can someone help with this? I need to interface a 4x4 matrix keypad > to a basicx and output this as 8-bit BCD. Also is there a way to do > key mapping? At present Im using a Fairchild keypad decoder IC or > this project but the problem is it wont allow me to assign the rows > and colums to the output I would like "row 1 col 4 on the keypad is A > but the chip sees it as 4" Any help would be great > > Jason > > [Non-text portions of this message have been removed]

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