Help po Uminit yung PIC877A at Yung LM340

[0hñ33n]

http://thumbp2.mail.re4.yahoo.com/tn?sid=1245557586&mid=AMMwvs4AAPk%

Hello Po.. Pacheck naman po kung Tama or ok lng po ung Connetion ko sa Keypad.. Binase po nmin yan sa Book ni D.W Smith titled "PIC in Practice A Project-Based Approach" page94...

Suggestion correction is highly appreciated... thanks you po in advance...

[0hñ33n]

Hello Po.. Pacheck naman po kung Tama or ok lng po ung Connetion ko sa Keypad.. Binase po nmin yan sa Book ni D.W Smith titled "PIC in Practice A Project-Based Approach" page94...

Suggestion correction is highly appreciated... thanks you po in advance...

[maldihtah13]

Hello Po.. Pacheck naman po kung Tama or ok lng po ung Connetion ko sa Keypad.. Binase po nmin yan sa Book ni D.W Smith titled "PIC in Practice A Project-Based Approach" page94...

Suggestion correction is highly appreciated... thanks you po in advance...

Suggestion ko palakihin mo ung picture ksi hindi ko makita.

[0hñ33n]

ito na po ung picture hee hee  ito po ung schematic ng Hex 4x4 Keypad namin eheehee

ito naman po ung Keypad Binary to Hex conversion nya

mejo malabo po scan kasi hee hee 

[maldihtah13]

Hello Po.. Pacheck naman po kung Tama or ok lng po ung Connetion ko sa Keypad.. Binase po nmin yan sa Book ni D.W Smith titled "PIC in Practice A Project-Based Approach" page94...

Suggestion correction is highly appreciated... thanks you po in advance...

Based in your diagram you are planning to use a keypad matrix.

Ganito kasi ang operation ng keypad matrix. The first four bits will be an output and the other four as input.

The first output pin is set while the four input bits are monitored. After that the first bit is reset then the next output will be set while monitoring the inputs. This will be done on four output bits. In short the process of checking the port is by scanning every row or column depending on your configuration.

Hope this helps.

[underprezzure]

@Ohneen
You dont need to put resistors on both side of your keypad. And on your code conversion it seems you are just shorting a row and a column(bad practice) which could result to undesired result.   (result to undesired result?? hmmm parang wrong grammar yata ako   ) Now, as what nomad13 says the operation of the matrix keypad needs an output and input. Hence, consider revising your schematic and code conversion design.

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[underprezzure]

I cant edit my post: hence i will post a new one.

@Ohneen
You dont need to put resistors on both side of your keypad. And on your code conversion it seems you are just shorting a row and a column(bad practice) which could result to undesired result kasi parehong galing sa Vcc.   (result to undesired result?? hmmm parang wrong grammar yata ako   ) Now, as what nomad13 says the operation of the matrix keypad needs an output and input. Hence, consider revising your schematic and code conversion design.
Your schematic needs resistor configuration like this http://ww1.microchip.com/downloads/en/AppNotes/00529e.pdf or use this:
http://www.serasidis.gr/circuits/lcd_keys/lcd_keys.htm

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[0hñ33n]

ok n po thanks for reminding dapat pla inputs lng ang directed to gnd if not used thanks for checkin salamat po sir

 

Sir sa PCB ba ok lng na irekta ko nlng to sa PCB or mas maganda pa rin ung Socket.. kc just incase uminit wag naman maka2pagpalit kmi ng ULN2003 kagad..

[RaffT]

Sir sa PCB ba ok lng na irekta ko nlng to sa PCB or mas maganda pa rin ung Socket.. kc just incase uminit wag naman maka2pagpalit kmi ng ULN2003 kagad..

sa mga prototyping, recommended ang IC SOCKET.. di naman yan RF circuits..

[1110000]

kung may analog input ang PIC nyo pede rin po yung isa lang na pin ang gagamtin nyo tapos isang pin common nakacommon lang yung lahat ng buttons sa ground tapos may mga resistors with different values sa isang pin ng button bale tapos may isang resistor din na nacacommon ssa postive bale voltage divider lang ito na nagiiba iba ng volts ang output