newbie questions on bs2
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Posts: 46,084
hi all
i have heard that pins of bs2 are easy to get burned out.
my question is that do i need to put resistors on all output/input
pins to project them?
what value of resistors is good for protecting pins on any knid of
project with bs2?
thanks
i have heard that pins of bs2 are easy to get burned out.
my question is that do i need to put resistors on all output/input
pins to project them?
what value of resistors is good for protecting pins on any knid of
project with bs2?
thanks
Comments
>hi all
>
>i have heard that pins of bs2 are easy to get burned out.
>my question is that do i need to put resistors on all output/input
>pins to project them?
>what value of resistors is good for protecting pins on any knid of
>project with bs2?
>
>thanks
Generally a 220 ohm resistor is used to protect the I/O pins. That value is
based on Ohms Law which shows: 5 volts / 220 ohms = 23 ma which is less
than the individual I/O Port capacity limit of 25 ma.
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said, a direct short can damage a pin permanently. Where the
opportunity for a programming error to cause a direct short exists we
suggest a 220 ohm resistor to protect the IO pin. In fact, we build 220
ohm resistors into the HomeWork board and other student-oriented
products.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: i_drives [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=YW-5kbnCgWof5SzW0fBtXCQr1BdbrE_3dwwkdlNyoinHqOcFlG4uisj4sNEvxxCLA9B1X7P1Qt1zJQ]i_drives@y...[/url
Sent: Friday, November 28, 2003 3:50 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] newbie questions on bs2
hi all
i have heard that pins of bs2 are easy to get burned out.
my question is that do i need to put resistors on all output/input
pins to project them?
what value of resistors is good for protecting pins on any knid of
project with bs2?
thanks
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