Heat.
Andy B
Posts: 17
Hi there i am new to the Stamp, i just bought a Stamp2SX and Board of Education second hand.
It works fine when i connect to my PC and it recognises the chip, My Question is when i connect a 9V batterie to it the stamp seems to get a bit Hot! is this normal? or should i use some sort of heat sink?
many thanx
It works fine when i connect to my PC and it recognises the chip, My Question is when i connect a 9V batterie to it the stamp seems to get a bit Hot! is this normal? or should i use some sort of heat sink?
many thanx
Comments
Not to be stupid, but describe Hot, like the voltage regulator on the BOE or the Stamp itself? Look for any user modifications on the BOE or the Stamp, if you bought it used, you may need to go to the Parallax site and download the docs and correct any previous user modifications if there are any.
I use a BS2p24 on a board that I built from the schematic from the Parallax site. I used the parts as called out in the schematic diagram, the regulator gets warm (warmer than body temp but holding it won't burn me) also the BS2p24 gets a little warm but not enough to be concerned about. If yours is getting to hot to touch where it is painful after a few seconds, (A) your a wimp!
Mike
Post Edited (Mike Cook) : 8/22/2004 11:49:06 PM GMT
the BOE has had no modifications neither has the Stamp
The stamp itself gets hot with a 9V battery, i just read that·the Stamp·has a onboard regulator so it could be that huh?
Its Hot as in hot to the touch, and keeping finger on it for a while you feel it.
Its not the regulator on the BOE.
thanx
Mike
I just measured my stamp (bs2p24) running a menu program, and a couple of LED's and Mr. Fluke (Thermocouple probe) said it was 82 degrees Fahrenheit, felt hotter to me via my finger!
Mike
I will keep an eye on it, it hard to test if its working properly at the moment as i only just bought the Stamp and BOE yesterday, as yet i do not have any servos or anything to connect to it so i can do a short code to test it.
Once again thank you
The BS2p is a bit faster that the BS2sx in operation, but since it operates in turbo mode with a 20hz xtal, it draws less current, 40mA, 0.2 watt, so it does not get as hot.
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Tracy Allen
www.emesystems.com
Thank you for the info, puts my mind at rest.
Is there a small circuit and code i can use to test with LED's etc?
Just want to make sure this actually works else i will have to try and get money back.
Thanks again
http://forums.parallax.com/showthread.php?p=465929
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Tracy Allen
www.emesystems.com
However, I cannot see spending any $$ for such a device for the hobbyist.
Just my 0.02 cents.
Ken
I use a tester like that on my OEM boards, but the board also has pins dedicated to things like the ADC and RTC etc. that have to be tested for functionality each in their own way.
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Tracy Allen
www.emesystems.com
Ken,
·· For alot of people on here, buying one of Sid's testers may not be something they want to do.· But from the sheer amount of posts from Newbies who aren't sure if they cooked their BS2 plugging it directly into a relay, or something, it might just be the ticket...Besides, I don't think he's asking alot for them.· Of course, I built my own...And that was before he posted them, but many people that use BS2s cannot.
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Chris Savage
Knight Designs
324 West Main Street
P.O. Box 97
Montour Falls, NY 14865
(607) 535-6777
Business Page:·· http://www.knightdesigns.com
Personal Page:··· http://www.lightlink.com/dream/chris
·
with resect to the original thread...· If you put 9Vdc to the Vin pin on the stamp, I was under the impression that this was BAD.
I thought the Vin pin was reserved for 5Vdc only.· And that anything greater was to go through the regulator....or is this different on the BS2p's?
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·
Steve
http://members.rogers.com/steve.brady
http://www.geocities.com/paulsopenstage
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
9V to the VIN(24) pin would fine, however 9V to the VDD(21) pin would be very bad.
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Beau Schwabe Mask Designer II
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
I'm always forgetting that the stamps has an on board regulator.· What are it's limitations?· What voltage does it top out at before we let out the smoke!?
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·
Steve
http://members.rogers.com/steve.brady
http://www.geocities.com/paulsopenstage
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
I connected a Duracell PP3 9V battery to the connectors that is all.
the chip gets Very hot.
Infact i tried this :-
' HIGH_LOW.BS2
' This simple program sets I/O pin 0 high for 1/2 second and low for
' 1/2 second in an endless loop. Connect an LED to P0 for a simple
' blinker.
' {$STAMP BS2sx}
Main:
HIGH 0
PAUSE 500
LOW 0
PAUSE 500
GOTO Main
END
it downloaded ok ran the program and the little LED flashed for about 5 seconds, then stopped
the chip was so hot, i unplugged the battery.Waited abit and reconnected, No flashy light !!!!!!!
I reconnected to the serial cable COM1 and it recognised the stamp, tokenized it ok but when it went to download said Hardware failure..?
I am sooooooooo STRESSED !!!!!!
Do you by chance have a current limiting resistor on your LED? If not your stamp will get hot and possibly damaged.
If the above is true, I would more than likely try another pin and/or another LED as the LED could also have self destructed.
Using the following formula and a typical LED with forward voltage of 1.8V and a current rating of 10mA...
Rvalue = ( VSource - VLED ) / ILED
Rvalue = (5V - 1.8V) / .010 = 320 Ohms
...The closest standard Rvalue to this would be at least using a 330 Ohm resistor.
330 LED
Stamp Pin >
/\/\
>|
< GND
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Beau Schwabe Mask Designer II
National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071