LED Light Bulbs | LimitlessLED Color WiFi Bulbs For iPhone And Android ArchDaily Controlling high power (or high number of) LED’s with an Arduino | The Custom Geek A while ago I posted about my bench lights, and have gotten a number of request for schematics and code. I’ll gladly put the code up, but I also wanted to explain what I did so that others can create their own, or at least change my design up as they wish. The transistors I’m using are TIP122′s. You can find the data sheet here. I covered the basic schematic for a few LED’s in the video above, but if you have any questions, feel free to post them in the comments and I will answer as quickly as I can. You can download the original (controller with LCD and hard buttons) code here. You can also download the newer (serial controlled – adjustable level) code here. Just a note, I will be using Vimeo from now on, but I will still put all my videos on YouTube as well. This entry was posted in Arduino, Cool Stuff, LCD, LED, Open Source Hardware and tagged 328, Arduino, Atmel, darlington, LED, PWM.
ArchNow! starlight: Dimming a 12V LED strip with a mosfet and PWM Dimming a 12V LED strip with an N-channel power mosfet is pretty straightforward. In this experiment I'm using 5 meter of cool white LED strip running at about 800 mA giving 10 Watt. An Arduino Duemilanove (my trusty lucky white one) is used to provide pulse with modulation ( PWM ). The following Arduino sketch does a simple PWM sweep in 10 steps per second: 1 void setup() 2 { 3 pinMode( 9, OUTPUT); 4 pinMode(10, OUTPUT); 5 } 6 7 byte b = 0; 8 9 void loop() 10 { 11 analogWrite(9, b); 12 analogWrite(10, b); 13 delay(100); 14 ++b; 15 } This gives a PWM signal as shown in the (crude) video below. This is actually good enough for simple dimming, but lets look at it more in detail. Whats interesting to see is that it takes about 600ns in total to go from 0V to 5V at the mosfet gate. I got quite some interesting info concerning mosfet gate drivers from this Texas Instruments paper. One solution suggested by the paper is to use a Bipolar totem-pole driver. First thing I checked is RGATE.
Peerutin Dimming a 12V LED Strip with an Arduino | Nick Rowe I have a nice LED strip above my desk area that lights up the whole workspace: As part of building spirit, an internet of things hub, I’ve been thinking about how to get different kinds of things into the system. I would love my desk lights in the system. Maybe there’s a pressure sensor in the chair or a button on the desk and when I sit down, the lights come on and is ready to work. I should point out here, that I am just a hobbyist electronics tinkerer. This is a where a transistor comes in. And here’s what wiring diagram looks like in the real world: In this picture, the LED strip is connected by the thicker black cable snaking off on the bottom and the 12 volt power is connected to the breadboard with the orange and green cable on the right. You’ll also need some code for the Arduino, here’s just enough to get started. This code works but using pin 9 as an analog, pulse width modulated (PWM) output.
plusMOOD RGB LED weatherproof flexi-strip 30 LED - (1 m) ID: 285 - $16.00 These LED strips are fun and glowy. There are 30 RGB LEDs per meter, and you can control the entire strip at once with any microcontroller and three transistors. The way they are wired, you will need a 9-12VDC power supply and then ground the R/G/B pins to turn on the three colors. Use any NPN or N-channel MOSFET (although the big powerful kind is good for a large strip) and PWM the inputs for color-mixing. For powering, a good 12V supply is key. The one we carry will do well for fixed installations. We splurged and got the weatherproof kind with white background color. Please Note: these strips are weatherproof so they'll be more rugged than uncoated strips, but they not designed for long term submersion in water, especially chlorinated water, or exposed to UV (eg sunlight) for extended periods of time. You can cut this stuff pretty easily with wire cutters, there are cut-lines every 10cm (3 LEDs each), and trim off the weatherproof cover with a hobby knife.
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