problem in LCD and CIRCUIT in “Keypad based simple electronic lock using 8051 microcontroller (AT89C51)

[Shubham]

Sir, I am making "Keypad based simple electronic lock using 8051 microcontroller (AT89C51)".This project is given on the site as well. i copied the code as it is from there, executed it in RIDE and dumped the hex file into the IC using PROLOAD.

 

Now when i connect the circuit as given on the site and switch on the power supply the lcd just shows big dark square blocks instead of the msg enter password. even when i press digits on the keyboard, i can see nothing.

Pls tell me whats going wrong there. I have to submit the project in a week.

pls help…

[Shubham]

do i need a separate code for lcd and keyboard interfacing as well.

I would really appreciate if i could get few inputs on this.pls

[utpal dutta]

Your problem in LCD contrast controll circuit. Have you use any preset in pin no. 3 of LCD. If yes, then controll it your letters will be illuminated.

 

[Dexter]

this is my working circuit diagram

for more details contact [email protected]

wysiwyg_imageupload:3288:

[Dexter]

this is my working circuit diagram

for more details contact [email protected]

wysiwyg_imageupload:3288:

[Gautam]

i think there is need for connecting capacitors across the crystal oscillator.just go through connections for crystal oscillator in any standard text like AYYALA.it may help u a lot

[Madiake Wasubera]

Hi all,can someone help me with this code but writing it in Salford C,i was asked to write the electronic lock keypad simulation program,anybody willing to help me email me at [email protected]  ;;;;;PLIS HELP ME WITH THIS PROGRAM BUT IN SALFORD C.

[Author]

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