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Elektor is more than a magazine, it is a community of active electronic engineers eager to learn, make, design and share surprising electronics. If you would like to join this community by purchasing a yearly membership you may consider this exclusive offer. Elektor, offers 50% discount on yearly membership on all electronics-lab.com visitors. To benefit from the offer just enter E-LAB16 code on this form. The offer is valid for Elektor GREEN Membership and costs US $37.50 (€34.00 / £24.48) for a year.

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1.8″ DIY Photo Frame using and Arduino Nano and a ST7735 Color TFT display

In this video educ8s.tv is  going to show us how to use the SD card slot of the popular 1.8″ Color TFT display which uses the ST7735 driver. Then we will save some bitmap images in the SD card and we will display them on the display. In other words, we will build a simple Photo Frame using Arduino!

If you have watched some of my previous videos, you may have noticed that I use this 1.8” color TFT display a lot recently. The reason for that is that this display is very easy to use, it costs less than $5 and it offers color! At the back, the display has an SD card slot, so I thought that we have to learn how to use that as well. As it turned out, it is really easy to use the SD card slot of the display! That makes this display even better.

The project that we are going to build today is this. A simple photo frame which loads images from the SD card. I have placed some .bmp images in the SD card and the project loads them and displays them at the display in full color! As you can see the speed of the project is very high if we take in consideration that the brains of this project is the old and slow Arduino Nano. In my opinion, this is really impressive. But let’s now see how to build this project.

1.8″ DIY Photo Frame using and Arduino Nano and a ST7735 Color TFT display – [Link]

150V DC/DC inverting controller: single inductor, ground-referenced control

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LTC3896 is a high voltage inverting switching regulator controller that drives an all N-channel synchronous power MOSFET stage. Most low to medium power inverting DC/DC converters use a coupled inductor or transformer: this device uses only a single inductor.

The chip converts a 4V to (150V – |VOUT‾|) positive input voltage to a regulated negative output voltage from -60V to -0.8V at output currents up to 15A. Efficiencies are as high as 96%, for transportation, industrial, telecom and power distribution applications.

150V DC/DC inverting controller: single inductor, ground-referenced control – [Link]

Curve Tracer Project

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Jason Jones has tipped us with his latest project. He is working on a semiconductor curve tracer and details his progress on his website.

I have thought about this a lot recently and – in order to get the cost down – the unit must have a cheap or available power supply and must coopt the screen for another device.  The first and easiest thing that comes to mind is to simply use USB for the power supply and use your PC screen as the screen.  This is the direction that we will go for the moment in order to keep things simple.  Up to this point, we have a screen and power supply without even starting the design.

Curve Tracer Project – [Link]

How to Use Arduino and a RF 433 Long Range

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This is a tutorial on how to use a 433MHz long range transmitter/receiver with Arduino.

I just explain how i have use the 433MHz RF Long Distance Transmitter / Receiver Pair and a arduino to install it on my rc truck for a firework ignition, lamp , pan tilt camera system

How to Use Arduino and a RF 433 Long Range – [Link]

DIY Mini Quadcopter with 3D-Printed Frame and Custom Firmware

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Simon D. Levy designed and build a mini quadcopter with 3D printed frame and custom C++ firmware. See the full project notes including bill of materials and more photos on the link below, and check out Simon’s blog on the C++ firmware here.

I wanted to try my hand at a true “DIY” project, designing and building my own micro quadcotper frame and writing my own firmware in C++.  In this post I will describe the frame and build; in my next post I will talk about the firmware.

DIY Mini Quadcopter with 3D-Printed Frame and Custom Firmware – [Link]

Energy monitoring using ATM90E26

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Tisham Dhar designed an ATM90E26 energy meter breakout board which can be used in single phase power measurements.

After designing and testing the ADE7763 based Energy Monitor Breakout Board, I started looking around for cheaper and more modern alternatives.I came across the Atmel ATM90E26 Smart Metering IC with dual communication options – UART/SPI and multiple metering modes (tamper proofing with current sensing on live and neutral).

Energy monitoring using ATM90E26 – [Link]

RC snubber calculator spreadsheet

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Paulo has developed an Excel-based calculator that eases the design of RC snubbers in power switching applications:

In power switching applications, a designer often has to contend with spurious oscillations. These are the result of parasitic capacitances and inductance on the board and behave like the step response of an RLC circuit. These transients can induced undesired noise in neighboring circuits and create over voltage spikes that can compromise long term component reliability.

RC snubber calculator spreadsheet – [Link]

IBM scientists achieve storage memory breakthrough

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For the first time, scientists at IBM Research have demonstrated reliably storing 3 bits of data per cell using a relatively new memory technology known as phase-change memory (PCM).

The current memory landscape spans from venerable DRAM to hard disk drives to ubiquitous flash. But in the last several years PCM has attracted the industry’s attention as a potential universal memory technology based on its combination of read/write speed, endurance, non-volatility and density. For example, PCM doesn’t lose data when powered off, unlike DRAM, and the technology can endure at least 10 million write cycles, compared to an average flash USB stick, which tops out at 3,000 write cycles.

IBM scientists achieve storage memory breakthrough – [Link]

Interfacing 8×8 LED Matrix with Arduino

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This tutorial will show how to interface a 8×8 LED matrix with Arduino. Example code is provided.

LED matrix displays can be used to display almost anything. Most modern LED sign boards uses various types of matrix boards with controllers. In this tutorial we are going to interface a single color 8×8 LED matrix with Arduino and display few characters in it.

Interfacing 8×8 LED Matrix with Arduino – [Link]