AVR-Chat

Whoops...thought this was posted in my MSP430 forum! My bad!

ifdef "Re: [AVR-Chat] Radio servo for analogue indicator?"
#define MSP430 AVR
endif

:)

Dave

On Wed, 2004-12-15 at 22:16, David D. Rea wrote:
> > LED's are in use at the moment, but useless under nominal lighting
> > conditions. Bright daylight.
> 
> There are a variety of very bright daylight-visible LEDs on the market.
> Some output hundreds of mcd in only tens of milliamps. 
> 
> Consider this option - arrange six high output bi-color (red-green) LEDs
> in a line. Use the PWM capability of the MSP430 to drive each of them.
> As the indicator "rises", first the LED begins to glow green, then
> becomes a brighter green, then the PWM begins to introduce red. As more
> red is proportionally added, the color changes from green to yellowish.
> At 50/50, the LED appears yellow. Then, as the indication continues to
> rise, the light begins to appear more and more orange, then red. 
> 
> This would have sort of a "VU meter effect" and would be very good for
> at-a-glance readings. All functionality could be achieved on-chip.
> 
> A quick Digi-Key search returns a high-output red/green LED in a 5mm
> case, the Lite-On LTL-293SJW. It outputs 90mcd red, 40mcd green -
> intensity will look about the same due to varying spectral sensitivity
> of the eye when both are run at 20mA. They are $0.37 each and there are
> thousands in stock - might as well pick up a few and try them. At that
> price, even if it doesn't work, it's not much invested!
> 
> Dave
> 
> 
> 
> 
>  
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
> 
>