Hi All
I am currently looking at a project to create an artificial starfield in a bedroom (because I can).
I hope to have a matrix of at least 256 leds; rows and columns of 16 say (maybe more)
The plan is to use rows to 'drive' anodes and and columns to 'drive' cathodes.
At the intersection of each row and column I plan to have a White 3mm led with a series resistor.
All simple so far, right?
I have looked on the Net and found example with Micro's driving Darlington arrays for this purpose.
I am thinking ULN2803's for 'driving' the anode and UDN2981's or similar to 'drive' the cathode.
Depending on how many row and columns I eventually go with, I may need to use an IO expander chip of some sort with my PIC to drive the arrays.
Does anybody have any idea's on all of this, also does anybody know of any reasonably priced sources for or alternatives to the UDN2981 (Must be readily available on the net)
Thanks
Bruce
I am currently looking at a project to create an artificial starfield in a bedroom (because I can).
I hope to have a matrix of at least 256 leds; rows and columns of 16 say (maybe more)
The plan is to use rows to 'drive' anodes and and columns to 'drive' cathodes.
At the intersection of each row and column I plan to have a White 3mm led with a series resistor.
All simple so far, right?
I have looked on the Net and found example with Micro's driving Darlington arrays for this purpose.
I am thinking ULN2803's for 'driving' the anode and UDN2981's or similar to 'drive' the cathode.
Depending on how many row and columns I eventually go with, I may need to use an IO expander chip of some sort with my PIC to drive the arrays.
Does anybody have any idea's on all of this, also does anybody know of any reasonably priced sources for or alternatives to the UDN2981 (Must be readily available on the net)
Thanks
Bruce