🚀 go-pugleaf

In article <1993Jan8.194916.8558@black.clarku.edu>, kbasye@black.clarku.edu (Ken Basye) writes:
|> 
|> I've been wondering lately about how one might build a very simple and
|> cheap color sensor. 

|> My first thought was to use three photoresistors with R, G and B
|> filters (just cellophane, perhaps).  Or perhaps there are tuned
|> versions that would give the same effect.  Better yet, a single
|> tunable photoresistor could be used with 3 consecutive readings.  
|> Are there cheap ways to measure dominant frequency directly?  Etc...


Check out a company called Hamamatsu.  They make a sensor just like this.

It's a rectangular photoresistor about 3x8mm or so in size, with a red,
green, and blue field on it.  The sensor has two differential signals coming
out, and one we had around here seemed to work pretty well.  Don't know the
price, but I don't think it would be out of this world.

BTW,they make a bunch of other high quality sensors dealing mostly with
optoelectronics.

-Olaf