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Stamp getting very hot — Parallax Forums

Stamp getting very hot

ArchiverArchiver Posts: 46,084
edited 2004-04-20 18:48 in General Discussion
hey everyone,
I have a BS2P40. I have an AC to DC adapter that puts out 5VDC. I
hooked up my stamp with some L293D chips to run stepper motors. Then
I noticed the stamp gets very hot. So hot that you cannot touch it.
I didn't think this was right so I powered down and unhooked all the
I/O. I have everything on a breadboard btw. I powered up the stamp
again and it gets very hot still. Any ideas what could be causing
this?
Thanks,
Greg

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2004-04-20 14:25
    1. Check the voltage of your adapter. Is it REALLY
    5VDC? Is it fully regulated? (if it cost less than
    $10.00 it's very unlikely that it is fully regulated)
    Check voltage both open-circuit and under load.

    2. The Stamp should NOT be supplying power to the
    L293D chips and the steppers -- they should have
    their own connection to power, the Stamp just
    provides signal.

    You're right, the Stamp should never get so hot
    you can't touch it. Some of the BS2SX models
    do get warm, but not that hot.

    --- In basicstamps@yahoogroups.com, "hwarangdo98" <hwarangdo98@y...>
    wrote:
    > hey everyone,
    > I have a BS2P40. I have an AC to DC adapter that puts out 5VDC. I
    > hooked up my stamp with some L293D chips to run stepper motors.
    Then
    > I noticed the stamp gets very hot. So hot that you cannot touch
    it.
    > I didn't think this was right so I powered down and unhooked all
    the
    > I/O. I have everything on a breadboard btw. I powered up the
    stamp
    > again and it gets very hot still. Any ideas what could be causing
    > this?
    > Thanks,
    > Greg
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-20 15:04
    You may have a bad BASIC Stamp. It should never get so hot that you
    can't touch it. I would suggest that you disconnect if from all IOs,
    and see if you can communicate with it using the editor (of course,
    you'll need power).

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office


    Original Message
    From: hwarangdo98 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=GtDuxgvBgxNstrTTItWpLeci_VQ41PhN19fT9ILP_edsMD_EGTMcJ-S_gROIPmBr43HvvLhdWFqIRChNb5_ydQ]hwarangdo98@y...[/url
    Sent: Monday, April 19, 2004 11:04 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Stamp getting very hot


    hey everyone,
    I have a BS2P40. I have an AC to DC adapter that puts out 5VDC. I
    hooked up my stamp with some L293D chips to run stepper motors. Then
    I noticed the stamp gets very hot. So hot that you cannot touch it.
    I didn't think this was right so I powered down and unhooked all the
    I/O. I have everything on a breadboard btw. I powered up the stamp
    again and it gets very hot still. Any ideas what could be causing
    this?
    Thanks,
    Greg
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-20 15:06
    Very good point, Trygve. His power supply may be unregulate and if that
    was applied to the Vdd line there might have been serious damage done to
    the BASIC Stamp. Let's hope not....

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office


    Original Message
    From: Trygve Henriksen [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=t2m6vrNv55XH26xyywS8OuHtz83gUtFi_fo6Q7JjfKG0atPCrDvmyEJv1kJGpYbIlDwETyYX7p-G-fAGdNKx4YoIFp96DXM]trygve.henriksen@v...[/url
    Sent: Tuesday, April 20, 2004 8:22 AM
    To: basicstamps@yahoogroups.com
    Subject: SV: [noparse][[/noparse]basicstamps] Stamp getting very hot


    Greetings!

    Is it the ENTIRE BS2P40 which heats up, or just one of the IC's on it?

    Is the 5V adapter a 'regulated'/'Stabilised' model?

    On which pin are you feeding it into the BS2P

    :-)
    Trygve


    Opprinnelig melding
    Fra: hwarangdo98 [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=thJpL-Etfx_QkuMzBxRuX3HkvCd-Q1tc7KDW7Ta8ifPtfvs_wHBwzk7OviBB8ewDw-KNxmamC-u7O9TluKg]hwarangdo98@y...[/url
    Sendt: 20. april 2004 06:04
    Til: basicstamps@yahoogroups.com
    Emne: [noparse][[/noparse]basicstamps] Stamp getting very hot


    hey everyone,
    I have a BS2P40. I have an AC to DC adapter that puts out 5VDC. I
    hooked up my stamp with some L293D chips to run stepper motors. Then
    I noticed the stamp gets very hot. So hot that you cannot touch it.
    I didn't think this was right so I powered down and unhooked all the
    I/O. I have everything on a breadboard btw. I powered up the stamp
    again and it gets very hot still. Any ideas what could be causing
    this?
    Thanks,
    Greg
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-20 16:27
    Thanks for the replies everyone.
    Here is what I did
    -I ditched the ac adapter. I am trying to make my unit portable
    anyway.

    -I could still communicate with the stamp using the adapter, but I
    would shut it off quickly because of the high heat.

    -It was the Ubicom chip on the stamp that was heating up.

    -For a solution, I took a car battery and using resistors I stepped
    the voltage down to 7.5 volts. I applied this voltage to the VIN pin
    and the ground to VSS. I turned the stamp on for a while and it
    never heated up.

    -I unhooked all of the I/O

    -I know the L293D chips wouldn't cause the stamp to get hot because
    they have their own power.

    -I really hope that I didn't damage the stamp. This is for my senior
    design project due this Friday. I will let everyone know how it
    works when I get back home this afternoon.

    Thanks for the help,
    Greg




    --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
    wrote:
    > 1. Check the voltage of your adapter. Is it REALLY
    > 5VDC? Is it fully regulated? (if it cost less than
    > $10.00 it's very unlikely that it is fully regulated)
    > Check voltage both open-circuit and under load.
    >
    > 2. The Stamp should NOT be supplying power to the
    > L293D chips and the steppers -- they should have
    > their own connection to power, the Stamp just
    > provides signal.
    >
    > You're right, the Stamp should never get so hot
    > you can't touch it. Some of the BS2SX models
    > do get warm, but not that hot.
    >
    > --- In basicstamps@yahoogroups.com, "hwarangdo98"
    <hwarangdo98@y...>
    > wrote:
    > > hey everyone,
    > > I have a BS2P40. I have an AC to DC adapter that puts out 5VDC.
    I
    > > hooked up my stamp with some L293D chips to run stepper motors.
    > Then
    > > I noticed the stamp gets very hot. So hot that you cannot touch
    > it.
    > > I didn't think this was right so I powered down and unhooked all
    > the
    > > I/O. I have everything on a breadboard btw. I powered up the
    > stamp
    > > again and it gets very hot still. Any ideas what could be
    causing
    > > this?
    > > Thanks,
    > > Greg
  • ArchiverArchiver Posts: 46,084
    edited 2004-04-20 18:48
    Well,
    I think my worst fears have been confirmed. I have 6.5 volts to the
    VIN on the stamp and now it won't communicate. I think I managed to
    fry it. Does Parallax fix broken stamps? What is the turnaround
    time?
    Thanks,
    Greg




    --- In basicstamps@yahoogroups.com, "hwarangdo98" <hwarangdo98@y...>
    wrote:
    > Thanks for the replies everyone.
    > Here is what I did
    > -I ditched the ac adapter. I am trying to make my unit portable
    > anyway.
    >
    > -I could still communicate with the stamp using the adapter, but I
    > would shut it off quickly because of the high heat.
    >
    > -It was the Ubicom chip on the stamp that was heating up.
    >
    > -For a solution, I took a car battery and using resistors I stepped
    > the voltage down to 7.5 volts. I applied this voltage to the VIN
    pin
    > and the ground to VSS. I turned the stamp on for a while and it
    > never heated up.
    >
    > -I unhooked all of the I/O
    >
    > -I know the L293D chips wouldn't cause the stamp to get hot because
    > they have their own power.
    >
    > -I really hope that I didn't damage the stamp. This is for my
    senior
    > design project due this Friday. I will let everyone know how it
    > works when I get back home this afternoon.
    >
    > Thanks for the help,
    > Greg
    >
    >
    >
    >
    > --- In basicstamps@yahoogroups.com, "Allan Lane" <allan.lane@h...>
    > wrote:
    > > 1. Check the voltage of your adapter. Is it REALLY
    > > 5VDC? Is it fully regulated? (if it cost less than
    > > $10.00 it's very unlikely that it is fully regulated)
    > > Check voltage both open-circuit and under load.
    > >
    > > 2. The Stamp should NOT be supplying power to the
    > > L293D chips and the steppers -- they should have
    > > their own connection to power, the Stamp just
    > > provides signal.
    > >
    > > You're right, the Stamp should never get so hot
    > > you can't touch it. Some of the BS2SX models
    > > do get warm, but not that hot.
    > >
    > > --- In basicstamps@yahoogroups.com, "hwarangdo98"
    > <hwarangdo98@y...>
    > > wrote:
    > > > hey everyone,
    > > > I have a BS2P40. I have an AC to DC adapter that puts out
    5VDC.
    > I
    > > > hooked up my stamp with some L293D chips to run stepper
    motors.
    > > Then
    > > > I noticed the stamp gets very hot. So hot that you cannot
    touch
    > > it.
    > > > I didn't think this was right so I powered down and unhooked
    all
    > > the
    > > > I/O. I have everything on a breadboard btw. I powered up the
    > > stamp
    > > > again and it gets very hot still. Any ideas what could be
    > causing
    > > > this?
    > > > Thanks,
    > > > Greg
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