In SX Microcontrollers, SX/B Compiler and SX-Key Tool, tdg8934 wrote:

That's an interesting approach. Let's see if I got this right. 

A HIGH on the pin would make Red a HIGH (off) and Green a LOW (on).

A LOW on the pin would make Red a Low (on) and Green a High (off).

A INPUT on the pin would make Red a Low (on) and Green a LOW (on).

This sounds like it would work - but I'm questioning if I would still need a pulldown resistor on the Red line and another pulldown resistor on the output of the invertor. 

I don't have any CD4049's but I have attached a list of parts I do have (some of them being):

74HC14 - HEX INVERTING SCHIMITT TRIGGER

74LS04 - HEX INVERTER

74LS05 - HEX INVERTER - LOW SCHOTTKY 

74LS14 - HEX SCHIMITT TRIGGER INVERTERS

 

CD4050BE - HEX NONINVERTING BUFFER

 

MC14069UBCP - HEX INVERTER

 

Perhaps if any of these won't work, something can be made up of what I do have (attached).

 

Thanks,

 

Tim

---------- End of Message ----------


You can view the post on-line at:
http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=284498#m284537

Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com

The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)