Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Arduino Shield Odd Problem - Ideas?

  • 22-11-2013 12:27am
    #1
    ozmo
    Registered Users, Registered Users 2 Posts: 3,878 ✭✭✭


    Shield needs a rub down before it will start :o

    Ive tried another Arduino and tried Ive tried running it without the Arduino - same thing - wont work unless you touch it to start it :confused:

    Video explains it...
    https://www.youtube.com/watch?v=hr_xC3Cyrac

    “Roll it back”



Comments

  • #2
    Johnboy1951
    Registered Users, Registered Users 2 Posts: 14,034 ✭✭✭✭Johnboy1951


    I would look for a bad connection on a pin .....


  • #3
    ozmo
    Registered Users, Registered Users 2 Posts: 3,878 ✭✭✭ozmo


    Johnboy1951 wrote: »
    I would look for a bad connection on a pin .....

    Probably - but if I touch it with a nonconductive item - pen or foam - it will not switch on. :confused:

    “Roll it back”



  • #4
    Johnboy1951
    Registered Users, Registered Users 2 Posts: 14,034 ✭✭✭✭Johnboy1951


    ozmo wrote: »
    Probably - but if I touch it with a nonconductive item - pen or foam - it will not switch on. :confused:

    Not unusual ..... touching it is not making the bad connection but causing a 'floating' pin to receive a trigger level bias which allows the start .......... that would be the theory :)


  • #5
    whizbang
    Registered Users, Registered Users 2 Posts: 1,953 ✭✭✭whizbang


    generally would look at the load/bypass capacitors for the oscillator, or crystal. I'm not sure if these things have crystals, but its common enough for crystals to have wrong capacitor values, or wrong configuration (series/paralell) selected

    The electrical noise from your finger is enough to kick it into oscillation.


  • #6
    ozmo
    Registered Users, Registered Users 2 Posts: 3,878 ✭✭✭ozmo


    whizbang wrote: »
    generally would look at the load/bypass capacitors for the oscillator, or crystal. I'm not sure if these things have crystals, but its common enough for crystals to have wrong capacitor values, or wrong configuration (series/paralell) selected

    The electrical noise from your finger is enough to kick it into oscillation.

    I think that may be it alright - lately I've found just tipping the crystal canister is enough to get it to boot.
    I was going to replace the crystal - but Ill try your suggestion first of the caps - just a little more tricky as they are surface mounted. Cheers.

    “Roll it back”



  • Advertisement
Advertisement