Re: ATMega16 I/O port protection diodes
2010-06-17 by Donald H
--- In AVR-Chat@yahoogroups.com, "Tim Mitchell" <tim@...> wrote: > > ----Original Message---- > From: AVR-Chat@yahoogroups.com > [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Mike > Bronosky Sent: 17 June 2010 15:31 To: > AVR-Chat@yahoogroups.com Subject: Re: [AVR-Chat] Re: > ATMega16 I/O port protection diodes > > > > > One sure fire way we over come this is the use of fiber > > optic cables. > > > > This is good advice for a comms link, but not so good when you are trying to power an LED. This is a no brainer !!! Why is this discussion happening !!! You can use a 2n3904 and 24 Volts DC source and Limit the current in the LED, resistors are cheap. Driving more then 4 inches from a microprocessor pin is just lazy and foolish. $.22 of parts takes care of any problem. And if the line gets spiked, you replace a 15 cent transistor not a microprocessor. don