3High efficiency Dual Voltage 3A power supply

I was looking for a dual voltage power supply initially to power an old HDD with 12V and 5V. I wanted to build a home server based on the Raspberry Pi. I later realized that I had a newer hard-drive that needed only 5V. By then I had already designed and built this one. This power supply has a typical efficiency of 85%+ under real-world conditions and is based on TI's TPS54383 DC-DC converter chip which ope ...

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Android Bluetooth Control Led RGB

Choose the hue of light that makes you feel more comfortable. Simple bluetooth remote control from which you can modify lighting from your mobile device or tablet. You have two separate RGB channels where you can get different colors per channel. Control adjustable intensity. Do it yourself . Thanks to the arduino platform in minutes you 'll Omniblug armed and ready for use. Discover all the features provid ...

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DIY LED Sign with MAX7219 Dot Matrix Module

To satisfy electronic DIY hobbyists, ICStation has developed MAX7219 Dot Matrix Module. It uses the Max7219 chip which do a great job on saving of MCU I/O. It can not only control each point individually, but also can be extended without limitation to meet your requirements on LED Sign, Team Logo and so on. What's more, it's controlled by the STM8S003F3 MCU with 1K data storge space which is low cost, low p ...

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Use a Momentary or Tactile Switch as a Pushbutton Switch

Just a Moment Tactile switches (a specific type of momentary switch) are everywhere and they are especially popular on DIY  electronics and microcontroller boards because they are well suited to act as a boot option or reset switch.  Particularly, momentary switches are switches that don't save their state when you depress the switch.  That is, when you push the switch (and while you have the switch depress ...

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Digitally controlled HIFI amp with 4 way mixer

Motivation Though I am a musician I don’t care for calling an expensive hi watt stereo my own. For years I have used a homebuilt stereo amplifier built around the TDA1554Q IC (basically just this chip in a nice box) and I am still very happy with the sound quality. This amp serves as a computer desk sound system, which acts as a radio/movie sound sytem as well. In the meantime the number of sound sources th ...

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Simple LED Projects using Arduino

This article is another step forward in learning more about Arduino.  In our previous article, I have written in detail about blinking an LED using Arduino. We have demonstrated 5 simple led based projects using arduino, which will help you to learn its basic concepts. 1. Blinking Two LED’s using arduino 2. Control LED using a Push button switch 3. Toggle an LED using Push button switch 4. Toggle 2 LED’s us ...

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Replace a rotary switch with a potentiometer

Microcontroller-based products sometimes require rotary switches. As many microcontrollers have an onboard ADC, it is easy to replace the rotary switch with a low cost potentiometer, when a rotary switch is too expensive or unavailable. Although digitizing a potentiometer setting to act like a switch requires only a few instructions, an immediate problem is that instabilities in value occur at the switching ...

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Exclusively select 1 of N relays

Sometimes you may need a group of switches where, if any switch is activated, it deactivates the previously active switch. This Design Idea implements such a function with relays. This “one and only one” function is often implemented as mechanical switches in which an actuator (usually a movable metal bracket) is used to switch contact groups on and off. When any switch is pressed, this bracket first deacti ...

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Reflowster – Soldering Controller for Surface Mount PCBs

An Arduino-compatible smart outlet designed to instantly turn your toaster oven into a reflow soldering station. Keep up to date with our progress by following us on Twitter: @Reflowster or visit us online at www.reflowster.com Reflow soldering Advances in technology continue to shrink the size of components. Hobbyists, who have traditionally worked with through-hole parts, are finding these parts harder an ...

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TI’s smallest, most efficient HD pico chipset 0.3″ HD TRP DLP

The new Texas Instruments 0.3" HD Tilt & Roll Pixel (TRP) DLP® Pico™ chipset is TI’s smallest, most power-efficient HD micro-mirror array and can generate 720p displays from compact applications, including tablets, smartphones, accessories, wearable displays, augmented reality displays, interactive surface computing, digital signage and control panels. The chipset delivers significantly higher levels of ...

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Step-by-step guide for making a very simple temperature and humidity meter

In this blog post, I am providing you step by step instructions to build a very simple temperature and relative humidity meter for indoor use. All you need to build this project are an Arduino Uno or compatible board, a DHT11 sensor, and a MAX7219 based 8-digit serial 7-segment LED display. The temperature is displayed in degree Celsius and relative humidity in percentage. Things required to build this proj ...

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Blink LED with Arduino – say Hello World

When we learn a new programming language in computer science (say C, PHP or Java), we begin the learning curve with the classic “Hello World” program.  We learn some essential keywords used in the programming language, then we learn the structure of the language and finally we begin to play with the language by making it display the two words “hello world” in our computer screen. So that’s how we begin to l ...

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