Open Question
hey, everyone! i hope everyone has settled into their digs and reacclimated to the world outside of pilchuck. slowly my faculties seem to be returning. so, do any of you remember that proposal that i (with monumental help from zen) was working on while at pilchuck? well, i got it! but now comes the hard part - executing it!
so, i am having trouble remembering what i need to do to allow for more that one LED per pin on the stamp. i know it had something to to with additional hardware, putting some other component on the breadboard, but goddamn, i can't recall the name of what i need. i have been perusing bookstores for various stamp programming books and looking for the microprocessor cook book (that's what it was called, right?) but am unsure what would be most helpful in this endeavor. any and all info from you wonderful interactive, experimental, electronic folks would just make me jump for joy. and feel free to email me at monika@altperspective.com.
ps: is this amnesia normal? hmmm.
posted by tina @ 2:31 PM
3 Comments:
Hi! I was just blog surfing and came across your blog. I really like it! Perhaps you would like to check out my site. We specialize in computer accessories, plus more. Perhaps you'll find sometihing you need. Thanks.
read "Can I control LEDs with the I/O pins?"
although it might not give you all the answers it is a start- You will have to try connecting the LED in series- positive leg to negative- positive to negative.
Yes. Simply use a 470 ohm resistor in series with the LED to limit the current draw through the I/O pin (see “How much current can the I/O pins handle?”). Also, keep in mind that most LEDs require a lot of current in relation to what the BASIC Stamp microcontroller can provide. If you attach and power 3 or more LEDs at one time from the BASIC Stamp module’s I/O pins, you are likely to see flaky and unpredictable results caused by voltage sag, I/O pin damage and/or hardware resets. Driver circuitry or low current LEDs will need to be used if you require such an application.
next google search is driver circuitry LED"s and BAsic Stamp. Asking around for you - perhaps see if you can contact the Dorkbots of Seattle.
good luck- when is the project being installed?
thank you so much for the point in the info. i have been all over the site that you and turi left up for us, what a resource! especially after we have all scattered back to our corners of the world. i will check out dork bot, also found some articles in nuts and volts with specs on using a part called the uln2003 which then requires 330 ohm reistor for every three led's. i will try out whatever options seem like they won't fry the stamp. oh, the opening is december 1st. so i have to get crackin. i like this learning curve, though. i'll keep you posted on the results. and thanks again.
~monika
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