[chbot] Voltage to colour RGB LED driver?

[Jasper Mackenzie]

> Never seen such a thing.
  Damn.
>
> How would you map voltage to colour ?
>
> 0 -5V -> ROYGBIV ?
  or 0-5V -> VIBGYOR, or even as little as GYOR from bi colour RG led.
>
> Should be reasonably easy using a micro with and ADC in and 3 x PWM out
  Was trying to avoid this step, but really aughtn't. I thought of using an  
RG LED and dual/quad op amp with R driven with positive slope (+AV), and G  
with negative slope(-AV+offset)... analogue fun 8)


Jasper

>
> At 12:29 p.m. 14/03/2012, you wrote:
>> Heyall,
>>  Thought that a single RGB LED could be a great way of visualising  
>> device
>> temperature.
>> I have been looking for Vin->Colour RGB LED driver chips, but cant find
>> anything. I assume that this _must_ exist, can anyone suggest a part
>> number?
>>
>> Cheers.
>>
>> Jasper