Put you multimeter is in continuity mode. For example, to read the value from potRed : analogRead potRed The analogRead function returns a value between 0 and Thanks for reading. February 2, Recommended Resources. What to Read Next…. Enjoyed this project? Stay updated by subscribing our newsletter! Thank you for reading, Rui Reply. Greetings Henk Reply. I might do that project in the future, after completing what I have on my list Reply. Dear, Rui Santos can you do a interview with me i really like your article and i want to ask you some questions for a science project Sincerely, Bear Reply.
Nice article. Very nice article for students. RGB lighting is one of those tricks that is trending upwards in usage for a variety of applications from under-cabinet accent lighting to PC Gaming Lights. As you will read ahead in this post, the plethora of color options and features on the market can be a little overwhelming. Remember back in school when mixing blue and yellow paint on paper made green? This type of color mixing is known as the subtractive model in which the primary colors are red, blue and yellow, mixing them makes the secondary colors.
In the Subtractive Model , the absence of color is white. Subtractive color mixing involves creating a new color by the removal of wavelengths from a light with a broad spectrum of wavelengths. Subtractive color mixing occurs when we mix paints, dyes or pigments…Therefore it is big in printing, dying clothes, etc. This model is only ONE of the two models that exist in the visible world, the one we will be paying attention to with lighting is the Additive Model.
Additive color mixing involves creating a new color by a process that adds one set of wavelengths to another set of wavelengths. This is what happens when lights of different wavelengths are mixed. When all the colors are added together we see white rather than many individual colors. This is called additive because all the wavelengths still reach our eyes.
In the additive model the absence of color is black and the source of color is light photons using different metal alloys. This is how RGB came about, where the primary colors are red, green and blue. The simplest version of an RGB LED has a combination of 3 separate light-emitting diodes in one package, housed under a clear protective lens.
The 3 primary color LEDs use the principal of additive color mixing we talked about above to make more colors than we can imagine. LEDs are dimmable by nature which allows each red, green and blue color to produce all the different hues of that color. Wall lights Recessed Surface mounted Ground lights Under cabinet lighting. Ceiling lights Recessed Pendant lights Surface mounted. Wall lights Recessed Surface mounted Underwater lights. Smart outdoor lighting Starter kits.
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Retro Scandinavian. Subscribe to our newsletter. I want to subscribe. Now, you can try to modify this program to create different color combinations by fading the other green and blue LEDs, too.
The next program uses a sine trigonometric function to achieve a smoother fading of the color blue. The crazy thing is, most of this code happens all in one line! Remember pseudo-code? Maybe you have a younger sibling who might want Sparki explained to them? That would be a great way to develop this skill so you can be a great leader on a robotics, engineering or scientific team in your future!
To explain this we have to work backwards, using the order of operations to explain the code that happens first before anything else. Which is the code inside the most parenthesis. You can actually jam as much math as you like into any section of code that is a variable.
The robot or computer does all the math without a complaint before executing the function that contains the variable. Also, please note that this time the B variable is a float , instead of an integer number. That means that B can be equal to a decimal value, which is super handy since the code adds.
Again, there are two different ways you could speed up or slow this code down. Can you figure out how to do that? Were those too easy? How could you change the code above to do that? How about taking that last section one step further and controlling multiple LEDs at once?
This way the value that pops out of the sin function will start at 1, instead of 0, where B starts. Then the value of sin R will go down as the value of sin B goes up and vice versa. Adding the third LED, green, is a little trickier.
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