danUK
United Kingdom
Asked
— Edited
Hi guys,
Is it possible to set the voltage of the ADC ports. I'm trying to get them to act as switches to control an LED array.
I've already used up the 20 Digital I/O's.
I want to set them to values 0 or 255 to switch between 0 & 5 volts'
Any thoughts would be appreciated.
Thanks
Dan
Hey danUK, there are a few options out there for controlling multiple LEDs with a few ports, one method that's gaining popularity is called Charliplexing. Charliplexing doesn't require any external components (besides resistors), you just but the LEDs in a matrix and control which LED comes on by setting some ports to inputs (High-impedance state), some to output high (5V) and some to output low (0V). Just google charliplexing and you'll get the info you need, probably check out instructables or Jimmie Rodgers' website.
Another method you could use is a Shift Register like the 74HC595 you'd just need 3 digital lines to control 8 LEDs. Anyway, good luck with your project!
Hi Skater_j10
Many thanks for the info. I'll check it out.