Did I fry something?
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The computer uses a short on the DB9 connector. (between DSR and RTS) The
computer can detect the stamp with no power connected. If you hooked up the
power wrong you can almost guarentee that the chip is blown. The BS's do not
have any reverse or overvolt protection. Does a simple ID work? Hope this
helps.
MH
Original Message
From: "Eric Schettler" <schettlee@p...>
To: <basicstamps@egroups.com>
Sent: Thursday, September 21, 2000 3:21 AM
Subject: [noparse][[/noparse]basicstamps] Did I fry something?
> Just a question... There is a possibility that I may have connected power
> wrong the first time I tried to connect power. There is probably a good
> chance I may have fried something. (Although the power was only from a 9
> volt.) Is there a good way to test each part, or a group of parts to
verify
> that everything is working properly? The computer detects the stamp just
> fine, but when trying to download information to it, it says that the
stamp
> isn't responding, and to check the power supply. I found out by grounding
> an LED with one post connected to an output pin that the power is going
> straight through the stamp. Is this normal? I hope someone understood
> everything I just said. If not, please ask me to rephrase, and I will try
> my best to clear things up a little. Thanks a lot!
>
> Eric
>
>
>
>
computer can detect the stamp with no power connected. If you hooked up the
power wrong you can almost guarentee that the chip is blown. The BS's do not
have any reverse or overvolt protection. Does a simple ID work? Hope this
helps.
MH
Original Message
From: "Eric Schettler" <schettlee@p...>
To: <basicstamps@egroups.com>
Sent: Thursday, September 21, 2000 3:21 AM
Subject: [noparse][[/noparse]basicstamps] Did I fry something?
> Just a question... There is a possibility that I may have connected power
> wrong the first time I tried to connect power. There is probably a good
> chance I may have fried something. (Although the power was only from a 9
> volt.) Is there a good way to test each part, or a group of parts to
verify
> that everything is working properly? The computer detects the stamp just
> fine, but when trying to download information to it, it says that the
stamp
> isn't responding, and to check the power supply. I found out by grounding
> an LED with one post connected to an output pin that the power is going
> straight through the stamp. Is this normal? I hope someone understood
> everything I just said. If not, please ask me to rephrase, and I will try
> my best to clear things up a little. Thanks a lot!
>
> Eric
>
>
>
>
Comments
wrong the first time I tried to connect power. There is probably a good
chance I may have fried something. (Although the power was only from a 9
volt.) Is there a good way to test each part, or a group of parts to verify
that everything is working properly? The computer detects the stamp just
fine, but when trying to download information to it, it says that the stamp
isn't responding, and to check the power supply. I found out by grounding
an LED with one post connected to an output pin that the power is going
straight through the stamp. Is this normal? I hope someone understood
everything I just said. If not, please ask me to rephrase, and I will try
my best to clear things up a little. Thanks a lot!
Eric
>Just a question... There is a possibility that I may have connected power
>wrong the first time I tried to connect power. There is probably a good
>chance I may have fried something.
Although this won't help at this exact moment, Parallax is good about
replacing fried parts for beginners. More extensive changes may ... cost. I
don't know if there is any disclaimer regarding the OEM Stamp, but I would
certainly have taken that into consideration ... much earleir (read:
pre-purchase).
> (Although the power was only from a 9
>volt.) Is there a good way to test each part, or a group of parts to verify
>that everything is working properly?
Check to see if there is output from the regulator. If that's kaput - all
bets are off.
> The computer detects the stamp just
>fine, but when trying to download information to it, it says that the stamp
>isn't responding, and to check the power supply.
There in an ack-nak sequence which permits the "signalling" or hand-shaking
between the downloading executive and the Stamp core program. If this
DOESN'T take place - this error can occur. There are (many) other causes as
well. I haven't "probed" what the WinEditor does, so I can't tel you what
to look for or when. During the download process (when its working) an
O'scope will show activity on the programming line (Port 16),
>I found out by grounding
>an LED with one post connected to an output pin that the power is going
>straight through the stamp.
Make SURE there is a resistor in there ! Depending on the LED, that alone
can blow a pin port !
>Is this normal? I hope someone understood
>everything I just said. If not, please ask me to rephrase, and I will try
>my best to clear things up a little. Thanks a lot!
>
>Eric