EngineersGarage

  • Engineers Garage Main Site
  • Visit our active EE Forums
    • EDABoard.com
    • Electro-Tech-Online
  • Projects & Tutorials
    • Circuits
    • Electronic Projects
    • Tutorials
    • Components
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • Advertise
You are here: Home / Topics / problem in LCD and CIRCUIT in “Keypad based simple electronic lock using 8051 microcontroller (AT89C51)

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

|

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

  • This topic has 6 replies, 5 voices, and was last updated 13 years, 1 month ago by Madiake Wasubera.
Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • November 12, 2011 at 1:33 pm #3851
    Shubham
    Participant
    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…
    November 12, 2011 at 3:30 pm #6834
    Shubham
    Participant

    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

    November 19, 2011 at 3:42 am #6852
    utpal dutta
    Participant

    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.

     

    December 2, 2011 at 2:39 am #6896
    Dexter
    Participant

    this is my working circuit diagram

    for more details contact [email protected]

    wysiwyg_imageupload:3288:

    December 2, 2011 at 2:39 am #6897
    Dexter
    Participant

    this is my working circuit diagram

    for more details contact [email protected]

    wysiwyg_imageupload:3288:

    December 6, 2011 at 1:36 pm #6914
    Gautam
    Participant

    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

    April 26, 2012 at 1:40 am #7549
    Madiake Wasubera
    Participant

    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
    Posts
Viewing 7 posts - 1 through 7 (of 7 total)
  • You must be logged in to reply to this topic.
Log In

RSS Recent Posts

  • Wideband matching an electrically short bowtie antenna; 50 ohm, 434 MHz June 15, 2025
  • Curved lines in PCB design June 15, 2025
  • using a RTC in SF basic June 15, 2025
  • PIC KIT 3 not able to program dsPIC June 15, 2025
  • Siemens large industrial PLC parts June 15, 2025

Stay Up To Date

Newsletter Signup
EngineersGarage

Copyright © 2025 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Engineers Garage

  • Engineers Garage Main Site
  • Visit our active EE Forums
    • EDABoard.com
    • Electro-Tech-Online
  • Projects & Tutorials
    • Circuits
    • Electronic Projects
    • Tutorials
    • Components
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • Advertise