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Decay times for the 10K potentiometer - (Parallax "Build your own mini timer" program — Parallax Forums

Decay times for the 10K potentiometer - (Parallax "Build your own mini timer" program

jmerrelljmerrell Posts: 25
edited 2013-11-08 11:58 in General Discussion
I have built the Parallax mini timer circuit and am having problems when I run the TestNumbers.bs2 program. Nothing shows up in the debug screen except zeros, unlike the video. Also, numbers do not show up on the 7-segment led as I turn the pot except for zero. Need help please. Thanks

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2013-11-06 08:52
    1) Parallax tests their examples. If it doesn't work, there is something different about what you have compared to what you're supposed to have. Check your wiring. Check your code.

    2) Either provide copies of your circuit schematic and code or, at least, provide links to the Parallax examples if you haven't changed things at all.
  • davejamesdavejames Posts: 4,047
    edited 2013-11-06 10:51
    jmerrell - this post is considered "cross-posting" according the the Forum Guidelines, and is marked for deletion in a couple days:

    http://forums.parallax.com/showthread.php/134682-Forum-Guidelines

    Please continue this discussion in the original thread.

    Thanks.
  • jmerrelljmerrell Posts: 25
    edited 2013-11-06 17:29
    Dave, I'm not sure where the original post it. I am new to this forum. Thanks
  • jmerrelljmerrell Posts: 25
    edited 2013-11-06 17:52
    Mike, I'm leaning towards something being wrong with the decay circuit, however I think the circuit matches the photo of the mini timer as shown on Jessica's example. When I run the MiniTimerDecay.bs2, the numbers on the display don't change when I turn the pot, but stay at zero. I have attached a pic. The MiniTimer1.bs2 works as it should. The schematic is like the one in Jessica's project. Also, I am using the schematic from Jessica's project. Thanks for any help.
  • jmerrelljmerrell Posts: 25
    edited 2013-11-06 17:57
    Here is a pic of my RC circuit. Thanks

    SAM_3125.jpg
    SAM_3125.jpg
    1024 x 768 - 74K
  • RDL2004RDL2004 Posts: 2,554
    edited 2013-11-07 04:31
    That's not the most informative photo because it's a bit too close up and all the connections can't be seen. Also, many of the connections are blocked from view.

    The big red wire in the center isn't connected to anything and the push button looks suspicious.

    Check all the jumper wires for continuity or just replace them, they often develop internal breaks.
  • jmerrelljmerrell Posts: 25
    edited 2013-11-07 05:54
    RDL2004 wrote: »
    That's not the most informative photo because it's a bit too close up and all the connections can't be seen. Also, many of the connections are blocked from view.

    The big red wire in the center isn't connected to anything and the push button looks suspicious.

    Check all the jumper wires for continuity or just replace them, they often develop internal breaks.

    Here is a better photo. I was trying to detail the RC circuit in the last photo. Thanks for you valuable comments. :smile:

    MiniTimer.jpg
    MiniTimer.jpg
    1024 x 768 - 74K
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2013-11-07 06:42
    jmerrell wrote: »
    Dave, I'm not sure where the original post it. I am new to this forum. Thanks

    You can mouse click on your name when you are logged in and see a complete history of your post to locate the original. This thread was supposed to have been locked to force you and all others to go there.

    But that didn't seem to happen. I replied with help for you in the original... try to locate it.
  • davejamesdavejames Posts: 4,047
    edited 2013-11-07 08:13
    jmerrell wrote: »
    Dave, I'm not sure where the original post it. I am new to this forum. Thanks

    Hi j - the original post was in the Learn forum:
    http://forums.parallax.com/showthread.php/113179-Build-Your-Own-Mini-Timer

    However, both threads have progressed beyond my ability to merge them into one cohesive thread.

    Yup, I know you're new. Part of the moderator duties are to gently direct new members into the "way of the Forum Guidelines". :smile:
  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2013-11-08 11:06
    In the newer photo, the red wire is relocated... but still no connection to anything. Could it be that the user doesn't see that?
  • RDL2004RDL2004 Posts: 2,554
    edited 2013-11-08 11:29
    Another thing is the push button. Those little tactile buttons Parallax uses aren't made to work in plastic breadboards. The "pins" aren't round, they're wide and flat and don't fit well at all. They can have constant intermittent connection problems even when they look like they're pushed in good enough. You're probably better off just using two pieces of wire and touching them together to "push the button".
  • PublisonPublison Posts: 12,366
    edited 2013-11-08 11:58
    This was solved in another thread, ( he cross posted).

    http://forums.parallax.com/showthread.php/113179-Build-Your-Own-Mini-Timer?highlight=mini+timer
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