After some weeks without any free time for new projects, i give you my new led tester with brightness control. From time to time i need to test some leds and before i had a battery with a resistor hanging on to teste them. This is by far the worst solution to have on my [...]

How to convert ATX power supply into a bench supply.The power supply is based on an old pc ATX power supply. This is great because they are cheap, efficient and provide a huge amount of current on demand. He add an external voltage probe and a switch to allow voltage measurements either from the ammeter [...]

This application is tested only with Samsung Galaxy GT-i5700 Spica (rooted Android 2.1 OS, i570EXXJD1 Baseband version). The transmitter circuit uses Microchip’s dsPIC33FJ16GS504 for the analog-to-digital conversion of the input signals on two channels. The processed data on the dsPIC are then transmitted to the phone (for waveform display) via the LMX9838 bluetooth SPP module. [...]

Serial RS-232 (V.24) communication works with voltages (between -15V … -3V are used to transmit a binary ’1′ and +3V … +15V to transmit a binary ’0′) which are not compatible with today’s computer logic voltages. On the other hand, classic TTL computer logic operates between 0V … +5V (roughly 0V … +0.8V referred to [...]

This is a very simple circuit to make using a 555 component and is recommended for the electronics beginner. The idea is to have a flashing red led indicate that your car is protected. This device can protect your vehicle from potential thieves – it makes it look like your car has an armed alarm [...]

When you make MOSFET assemblies with especially when they are retrieved must be checked before assembly. This may seem very simple checker can check all N-type MOS-FET. Source: soloelectronica

The TV-B-Gone is a neat little device that can turn almost any TV on or off. It uses a microcontroller hooked up to IR LEDs to output a library of on/off codes. Adafruit sells a kit, and has the code as well as the schematic on their website. Here’s a micro clone of the TV-B-Gone [...]

The idea was to utilize a diffused RGB LED, an analog temperature sensor (really wanted to expand my working knowledge of the ADC on AVRs) and a frosted glass sphere to create a highly visible temperature indicator. I quickly sorted through my parts bins and found most of what I would need. A quick search [...]

The author of this project is Andrei Mehiläinen.This project is very simple thermometer with PIC16F88, two LM35 sensors and KS0108 graphic LCD.The code is written for CCS C compiler. There’s also Proteus VSM simulation file and compiled hex file.The Author also has completed a number of interesting projects, like: Project MapViewer, Audio spectrum analyzer, GPS [...]

This project is based on PIC 24HJ256GP206 processor and add a dash of knock-off touchscreen and a pinch of SD card compatibility for a DIY digital picture frame. [Daniel] wrote his own driver for the HX8347 controlled LCD that can achieve 15 FPS at 320×240 resolution with 16-bit color. As this was a gift for [...]

The Crazy Looper is a small hand held device that allows you to create real-time noise loops with a fast modulation metallic effect. It’s a simple microcontroller project that I give an easy to build rating.   Source: rarebeasts