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16  Forum 2005-2010 (read only) / Interfacing / Re: Multiplexing leds, faint leds on: September 25, 2010, 07:59:00 am
Ok so it need a 1K resistor on the Base?

I dont see the problem with the idea? I got it from this:

I replaces the 7seg with led's and hooked the transistors to the 4067.

But like i said i know something is wrong with it, so any suggestions?
17  Forum 2005-2010 (read only) / Interfacing / Multiplexing leds, faint leds on: September 25, 2010, 07:23:47 am
Hi, im using 5 digital pins and one 4067 16channel multiplexer to multiplex 16 x 5 LED's. To multiplexer pulls the LED's to ground. (Its for my 16steps sequencer)

The problem im having is that, some led's glow faint when they should be off... I have the feeling im missing some diodes? but dont know where?

here is the schematic, Ow before the LEDS are 220 ohm resistors ofcourse.

18  Forum 2005-2010 (read only) / Interfacing / Re: inter-arduino communication on: October 15, 2008, 03:20:05 pm
I suggest using hex values for start bits and so on. Like 0xF0 (use the hex of a wierd ascii character u never use). Hex works faster in computer world. And easier to work with.
19  Forum 2005-2010 (read only) / Interfacing / Re: IC Network?? on: November 13, 2007, 05:25:24 am

Yeah i was gonna say CAN-bus aswell. Worked with it at school with a couple of PLC's. Worked fine smiley
20  Forum 2005-2010 (read only) / Exhibition / Re: Yet Another LED Flame on: October 30, 2008, 02:22:07 pm
Yeah very nice! Would love to see that code for learning! smiley
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