Touching SCL pin

Topic locked
Go To Last Post
4 posts / 0 new
Author
Message
hasanzadeh99
hasanzadeh99's picture
Level: Hangaround
Joined: Wed. May 15, 2019
Posts: 100 View posts
#1
Posted by hasanzadeh99: Fri. Nov 15, 2019 - 04:45 AM
  • 1
  • 2
  • 3
  • 4
  • 5
Total votes: 0

Hello all,

When I touch SCL pin in my  project the program will be pause, it means the LED toggling loop in while loop will be discard.why?

can every body help me?

Tags:

AVR Microcontrollers, AVR XMEGA
Last Edited: Fri. Nov 15, 2019 - 01:37 PM
    Top
    js
    js's picture
    Level: Moderator
    Joined: Wed. Mar 28, 2001
    Posts: 29086 View posts
    Location: Sydney, Australia (Gum trees, Koalas and Kangaroos, No Edelweiss)
    Posted by js: Fri. Nov 15, 2019 - 05:40 AM
    • 1
    • 2
    • 3
    • 4
    • 5
    Total votes: 0

    Don't touch the pin then, why do you feel the need to touch it?

    John Samperi

    Ampertronics Pty. Ltd.

    www.ampertronics.com.au

    * Electronic Design * Custom Products * Contract Assembly

    Top
    Kartman
    Kartman's picture
    Level: 10k+ Postman
    Joined: Thu. Dec 30, 2004
    Posts: 22724 View posts
    Location: Melbourne,Australia
    Posted by Kartman: Fri. Nov 15, 2019 - 08:00 AM
    • 1
    • 2
    • 3
    • 4
    • 5
    Total votes: 0

    Your body works as an antenna. When you touch the pin you inject 50/60Hz as well as other noise into the pin. At a guess, it might be that you don't have the correct pull up resistors on the SCL/SDA pins. Should be around 2k2 methinks.

     

    Top
    jgmdesign
    jgmdesign's picture
    Level: Moderator
    Joined: Mon. Mar 19, 2007
    Posts: 16248 View posts
    Location: Long Island New York
    Posted by jgmdesign: Fri. Nov 15, 2019 - 01:37 PM
    • 1
    • 2
    • 3
    • 4
    • 5
    Total votes: 0

    Answered HERE:

     

    https://www.avrfreaks.net/forum/...

     

    Jim

    I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

     

    "The critical shortage here is not stuff, but time." - Johan Ekdahl

     

    "Step N is required before you can do step N+1!" - ka7ehk

     

    "If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

    "Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

     

    Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

    Please Read: Code-of-Conduct

    Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

    Top
    Topic locked