![]() Looking for a simple circuit to control the light intensity of Light Emitting Diodes (LEDs) or similar lighting sources? Here is an Arduino based circuit with three independent pulse width modulated (PWM) channels to fulfil your requirements! Just follow the schematic diagram to complete the construction, and use any standard 9VDC Arduino power source to energize the system. If you interested in the Eagle files, her is the. (If, for what ever reason it doesn't work, just take the SOS pad or steel wool to the board again and clean off any residual toner.) Step six: Etch! **UPDATE** You can grab the PDF here. Don't be to rough while trying to take off the paper, the toner is very fragile and can easily scrape off. Step six : Soak the board in water to get the paper off. NO STEAM! Place the iron directly on top, let the board heat up a bit before you move the iron and then take the edge of the iron and burnish the entire thing to make the toner stick to the copper. Step five: place the copper clad board onto a flat surface with the copper facing up, lay the cutout design toner side down onto the copper and tape it in place, put a paper towel over the whole thing and iron it on the the highest setting on your iron. Any grease on it will make it so the toner will not stick to the copper. ![]() Step Four: clean the copper clad with an SOS scrub pad or steel wool until it shines, rinse it off and make sure not to touch the surface with your hands. But usually I will use a box cutter or Xacto knife by scoring it over and over again and then breaking it along the score line and cleaning up the edge with sand paper. ![]() the board can be cut by a bandsaw, a hack saw. Step three: Cut a piece of your copper clad that is a little bit larger then the design. do not scale, it is layed out on a 8 1/2 by 11 piece of paper and it should print just fine with out modification Step two: Cut out the design leaving a little bit of a boarder around the design. Step one: Print the PDF (found below) onto magazine paper, high gloss photo paper or a paper that is designed for PCB. The method that I like to use is describe beautifully in TechShopJim's instructable. There are a lot of great instructables about etching your own circuit board so i will not go over all the details here. The second image is a close up of the PDF that will create the final board. After I found the protoshield layout, I opened it and modified it in Eagle to what you see below. Her projects and contributions to the world of physical computing are outstanding and most of her work is open source giving people like me a chance to take their own projects to the next level. If you are not familiar with her work you should check her out. I ended up using the Protoshield layout that was designed by Lady Ada. Since I knew that I was using an arduino I wanted to make a protoshield that would fit the odd spacing on the USB boards, So back to the internet to find the right Eagle part. I created the circuit board using CADsoft Eagle. The arduino is saved as pdxMap.pde and the processing code is saved as serialLEDTest.pde Basically the Processing code will be setup like this: import rial.* Serial myPort void setup() I have posted the completed codes for you to take and modify and play with. Once I got it all to work, it was actually very simple. Francesco has put together a great tutorial about Processing serial communication and the Arduino. So i turned to this tutorial to set me straight. the first place that I looked was the reference section of both and, a lot of time and consideration has gone into the development of these sites and I applaud the effort, it was worth it! All the basic information that i needed was there but I was having a really hard time getting it all to work. I have always been a hardware type rather than software type, so I turned to the internet.
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