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
You are here: Home / Replies / i hv not seen the circuit but

i hv not seen the circuit but

|

Microcontroller › 8051 › More accurate schematic and circuit diagram for electronic password door locking system › i hv not seen the circuit but

October 5, 2014 at 5:36 pm #12262
Ashutosh Bhatt
Participant

i hv not seen the circuit but i will say you can connect keypad in two ways

in simple way you can directly connect rows and columns of keys to IO pins of device. no need to connect ground or supply.

in another way if you want to source or sink current when key is pressed throuch external source, you have to connect Vcc to keys

 

RSS Recent Posts

  • Washing Machine motor August 14, 2022
  • arduino help needed August 14, 2022
  • Looking for amplifier ic August 14, 2022
  • Light Automation via mqtt August 14, 2022
  • Right channel distortion on vintage fisher rs-2010 August 14, 2022

Stay Up To Date

Newsletter Signup
EngineersGarage

Copyright © 2022 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