This week I’m presenting a project easy to build and it might be in interest of automobile enthusiasts.
Certain vehicles, like Mercedes, BMWs and others, have a system that turns the cabin light off a few seconds after the doors are locked and with a fade-out effect .
This project does that.
The soul of the circuit is a 12F615 microcontroller. Pins 2 and 3 will be connected to jumpers that, either connected to 5V or 0V change the behavior of the circuit.
On/Off switch with fade effect - [Link]
This week’s project is an alarm simulator for car or motocicle and it couldn’t be more simple.
The microcontroller used was the 10F222 from microchip which it’s SMD ( SOT-23 )version only has 6 pins.
Car alarm simulator - [Link]
Dual color (4 line x 3 column) led, 12 white and 12 blue are intermittently switched controlled by two NPN transistors BC337. The speed and duty/cycle timing of lighting duration is determined by NE555 oscilator. The number of repetition of sequential lighting of each group of led is determined by 5-stage divide-by-10 Johnson counter with 10 decoded outputs and carry out bit (CD4017).
The intermittent lights from two group of led imitate the police car strobe lights.
The speed of switching off and on of led are continuously regulated by variable trimmer resistor.
24 LED Police Flasher - [Link]
Scott writes – [via]
The iCufflinks use an Atmel ATtiny4 microcontroller (MCU) as the brains to controlling the LED lighting pattern. The MCU is an 8-bit processor with 32 bytes of SRAM, only a handful of registers, and 512 bytes of flash for program storage. The stack is stored in the SRAM so you don’t really get to use it for anything.
The original hardware design and software are all open source and can be found on the Adafruit GitHub. One of the things about the design is that it runs on CR1220 batteries and it is recommended that they be changed after 24 hours of use. That is what got me thinking that I could improve this product to increase the amount of time between battery changes.
I have also never read nor written assembly code for an AVR processor and the last time I probably looked at assembly was 386 stuff about 20 years ago. So excuse any minor assembly style issues. I was temped to rewrite the code in C but with the limited flash space I had to rule this out. Had this been a ATtiny9 with 1k bytes I would have gone this route. The small overhead that AVR Studio introduces was just a tiny bit too much for this limited memory space.
Maker improves our open source hardware wearables! - [Link]
This circuit uses the 555 timer in an Astable operating mode which generates a continuous output via Pin 3 in the form of a square wave. This turns the LED (D1) on and off. The speed at which the LED (D1) is turned on and off is set by the values of R1 and R2.
Flashing LED Circuit - [Link]
EDN always has fun hacky posts..this one could be handy for a DIY project that wants a bunch of LEDs controlled by a single pin…
Drive 16 LEDs with one I/O line – [Link]
Dual Boot LED Control, RGB to HEX Converter @ The Custom Geek…
OK, so a while ago I fell in live with these Nokia 5110/3310 LCD displays. They use a library from adafruit.com that you can find here. They are small, fast, and don’t gobble up a lot of current. So I needed a project to make so I could use one. The result? A massive overkill of an LED controler with all kinds of options and features.
So I was thinking about a RGB to HEX Color converter that I had made for the 2.8″ TFTLCD, and the fact that I might want to figure out values without erasing my sketch I’m working on. Although it’s nice to see the color displayed on the screen it will end up on, sometimes you just need a quick answer. Thanks to brookware2000 (in the Adafruit forums), there is a nice small program here that will do the trick. But it runs on Windows, and I’m kind of a Mac guy. The answer? Build one into my nifty little box that already has 8 buttons, an RGB LED, and a nice LCD screen! So here it is.
Download the code here. (Arduino 22 .pde file) This is a version of the code that just has the color converter, I’ll do a video sometime of how to do the dual boot/setup thing.
Dual Boot LED Control, RGB to HEX Converter – [Link]
Does this LED sound funny to you? @ Evil Mad Scientist Laboratories… [via]
At first glance, these might appear to be normal 5 mm (“T-1 3/4″) clear lens ultrabright yellow LEDs. However, they’re actually “candle flicker” LEDs– self-flickering LEDs with a built-in flicker circuit that emulates the seemingly-random behavior of a candle flame.
In the close-up photo above, you can actually make out the glowing LED die on the left side, and a corresponding-but-not-glowing block on the right: the flicker circuit itself. In what follows, we’ll take a much closer look, and even use that little flicker chip to drive larger circuitry.
Does this LED sound funny to you? - [Link]