Over at hacknmod.com there is a poll about circuit simulation software. The software included on the poll are Falstad, Simulo, MultiSim, PSpice, WinSpice, NgSpice, LTSpice. What software do you use?
Sometimes when you’re designing a schematic, you don’t have the time or components to build the actual circuit. When this happens, what tools (if any) do you use to design and test your circuits?
What Circuit Simulation Software Do You Use? - [Link]
This project is a big LED matrix controlled by Arduino board and build inside an IKEA table.
The displays are connected to the Arduino to share the row select pins (A,B,C and D) and the control lines EN, CLK & LATCH. The serial lines R1,R2,G1,G2 have their dedicated pins. So there are 19 pins needed out of possible 20 (not counting the reset pins as I/O). As the displays are loaded in 16 rows a 64bit some transformation has to be done while loading the display.
LED matrix Arduino IKEA Coffee table hack - [Link]
This project is a RGB led controller based on Attiny15L microcontroller. It is the easiest way to control a RGB Led. The software is written in Assembler. Timer 0 is used to generate interrupts at about 30kHz. This interrupts are used to build a 8bit PWM. Timer1 is used to change the color pattern.
tinyRGB: Attiny15L RGB Led controller – [Link]
Jeri shows how to make blue electroluminescent (EL) powders from common ZnS:Cu green glow powder.
Make Electroluminescent (EL) Ink at Home – [Link]
This project is a 16×2 LCD Clock based on ATTtiny2313 microcontroller. The time is kept using internal counters of the mcu using interrupts and has an accuracy of 1 second / 48 hours. The 16 bit counter of the AVR is set to overflow when a second had lapsed and thus measuring time. Project files can be downloaded here. [via]
Interrupt driven Clock using ATTtiny2313 - [Link]
This project is a PIC metal detector based on PIC12F683 and uses only 5 components. Source code is available and written in mikroC PRO compiler. Check this project details on the link below.
picoDetector: PIC metal detector – [Link]
This project shows how to turn a DC-DC converter to a constant current source able to power some LEDs. It uses the TPS54232 step down dc-dc converter and the author started by reading the SLVA374 app note from TI which is a Step-Down LED Driver Design Guide based on the TPS54160 dc-dc converter. Check details of this design on the link below.
TPS54232 constant current source - [Link]
The Button Code is a system that allows a single button to act as a keypad. The user enters a 4 digit code into the system using button taps. When the correct code is entered a relay is activated. When activated it can either activate for a programmed time or simply toggle the output whenever the correct code is entered.
Button Code – Single Button Code Entry System - [Link]