Color Recognition... Needed Help...

[Nayyi]

Thanks for those who helped me in my dc motor problem, esp. to hero, the tip32 worked great! it really did amplified the circuit.

Now i want to build a project for Christmas, its like a game or something. Well i would be using it at our Christmas party as part of the games we are preparing. I would like to make a two player game named "the price is right". Its a money detector or more on a color recognition circuit. Paper money here in the Philippines are a bit colorful. i would be using the 20, 50 and 100 peso bills (color orange, red and violet(or some bluish) respectively in color) in my game. the thing is if i show them an item the would insert the money through the detector depending on how the item costs. just like that, to make it simple, yes its a money color detector or recognition.

the bad news is i dont know where exactly to start. please help me

 

[Boncuk]

Use coloured filters (to be found in good photo shops) to find out any colour, e.g. to "see" red the sensor (photodiode, phototransistor or LDR) must have a filter of that colour. Adjust sensitivity according to the sensor you apply.

 

[Nayyi]

hmm, but what if it needs to see 3 colors? hmm and what does a color filter looks like? hehe so many questions, and another thing do i really need an op amp ckt for this project? waaaaa Christmas party is going near! please help me, cant start even from a scratch

 

[Nigel Goodwin]

hmm, but what if it needs to see 3 colors? hmm and what does a color filter looks like? hehe so many questions, and another thing do i really need an op amp ckt for this project? waaaaa Christmas party is going near! please help me, cant start even from a scratch

Use three coloured filters - they look like a piece of transparent coloured plastic.

Opamps would be pretty well essential, and would probably make it a lort simpler.

A few days before you need it isn't a good place to start!.

 

[Gordz]

ADJD-S312 colour sensor from Avago works great. I have used this device and had very good results. My Device used white LEDs for a light source.

 

[Super_voip]

Very interesting, in the web page it said the chip could be embedded into digital phones,,,why????

 

[Gordz]

I also wondered how useful it would be in a 'phone. It's probably part of the marketing liturgy

 

[Gordz]

A bit of research turned this up :-
"illumination sensing for display backlight
adjustment such as colors, contrast and brightness
enhancement in mobile devices which demand higher package integration, small footprint and low power
consumption."

 

[matk95]

the way that i think would be best would be to have a red a blue and a green led and a cds cell then with a micro contoler flash the red led and mesure how much red is reflected then the blue then the green then use the difrent amounts to calculate the overall colour

 

[Super_voip]

Of course the red, green, yellow and blue can themselves be turned into sensors. Maybe this would be another way.