one I/O pin multiple led's?
Argghhhh another question from me! ok sorry, I am in need of using one I/O pin to put the same pulse through 13 ir led's. I am sure this is do able in some sort of way but I don't know how. I am pretty sure the stamp cannot drive 13 led's with a single I/O pin but maybe by putting all that power through a switching transistor and using the I/O pin to turn that transistor on and off really fast? maybe not possible. what ever the case my goal is to simply put 40000 Khz through 13 IR led's using 1 I/O. THANKS!!!
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Actually I think Im going to add the whiskers to my tank and let it roam, just need to figure out where.
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Actually I think Im going to add the whiskers to my tank and let it roam, just need to figure out where.
Comments
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Craig Eid
www.TriadRD.com
The power transistor hookup is the same as for a relay except that there's no coil, so no need for a protective diode.
The 7 series pairs with their resistors are wired in parallel and driven by the power transistor.
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Actually I think Im going to add the whiskers to my tank and let it roam, just need to figure out where.
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Craig Eid
www.TriadRD.com
Go to the main Parallax webpage, click on Resources, then the link to the Nuts and Volts Columns index.
http://www.parallax.com/Portals/0/Downloads/docs/cols/nv/vol1/col/nv6.pdf
I Think I understand I can directly connect a single I/O pin from the stamp to a single Input pin on a darlington ULN2803 and have up to 8 outputs, all outputs being the same as what is coming out of the I/O pin of the stamp, is this right? (and ofcoarse I have to connect power and ground to the 2803)
My simple mission is to drive 13 IR led's from 1 or 2 stamp I/O pins. Am I on the right track with this type of set up?
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Actually I think Im going to add the whiskers to my tank and let it roam, just need to figure out where.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Actually I think Im going to add the whiskers to my tank and let it roam, just need to figure out where.
Post Edited (PJ Allen) : 3/13/2009 1:56:12 AM GMT
I have updated the schematic and added annotation that conforms to the information on the datasheet. The schematic shows two driver chips, U1 and U2, and lists the pin number next to the input and output pins and 13 IR LED's.·You can drive a total of·16 IR LED's using this configuration but you will be pushing the limit on the single pin output current specification for the Stamp.
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························ Craig Eid
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Post Edited (Craig Eid) : 3/13/2009 5:59:30 PM GMT