5V to 12V Step Up DC-DC Converter

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Step up DC-DC converter is based on LM2577-ADJ IC, this project provides 12V output using 5V input, maximum output load 800mA. The LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), fly back, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable.

Requiring a minimum number of external components, these regulators are cost effective, and simple to use. Listed in this data sheet are a family of standard inductors and fly back transformers designed to work with these switching regulators. Included on the chip is a 3.0A NPN switch and its associated protection circuitry, consisting of current and thermal limiting, and under voltage lockout. Other features include a 52 kHz fixed-frequency oscillator that requires no external components, a soft start mode to reduce in-rush current during start-up, and current mode control for improved rejection of input voltage and output load transients.

Features

  • Requires Few External Components
  • Input 5V DC
  • Output 12V DC
  • Output Load 800mA
  • Current-mode Operation for Improved Transient Response, Line Regulation, and Current Limit
  • 52 kHz Internal Oscillator
  • Soft-start Function Reduces In-rush Current During Start-up
  • Output Switch Protected by Current Limit, Under-voltage Lockout, and Thermal Shutdown

5V to 12V Step Up DC-DC Converter – [Link]

MMC3630KJ – Magnetic sensor in BGA package

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image: electronicsmaker.com

MEMSIC has announced the MMC3630KJ magnetometer that integrates a monolithic 3-axis AMR (anisotropic magnetoresistive) sensor and a signal conditioning ASIC into a 1.2 × 1.2 × 0.5-mm BGA package.

According to MEMSIC, devices in the series offer the ability to deliver a magnetic sensitivity in a range of ±30 Gauss and achieve a noise level that is five times better than other technologies.

The new sensor aims wearables and smartphones due to small size and low energy consumption. Device features include self-degaussing and a power-saving interrupt function.

MMC3630KJ – Magnetic sensor in BGA package – [Link]

Arduino controlled Triac light dimmer

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diy_bloke @ instructables.com has build an arduino controlled triac light dimmer and describes the circuit and software used to achieve that.

It becomes a bit more tricky if one wants to dim a mains AC lamp with an arduino: just limiting the current through e.g. a transistor is not really possible due to the large power the transistor then will need to dissipate, resulting in much heat and it is also not efficient from an energy use point of view.

Arduino controlled Triac light dimmer – [Link]

RELATED POSTS

Arduino Inline Assembly Tutorial

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ucexperiment.wordpress.com has published a series of tutorials on how to use assembly language on Arduino. This can be pretty helpful if you want to do some advantaged coding on Arduino.

An inline assembly statement is a string which specifies assembler code. The string can contain any instructions recognized by the assembler, including directives (we will not discuss assembler directives here). GCC does not parse the assembler instructions and does not know what they mean or even whether they are valid. Multiple assembler instructions can be placed together in a single asm string.

Arduino Inline Assembly Tutorial – [Link]

RGB LED Strip Controller

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Thomas Gonnot has published a RGB LED Strip Controller based  on STM32F0 microcontroller. The controller is able to power NeoPixel and DotStar protocol RGB LEDs.

A simple controller for a RGB LED strip, with independent control of color and intensity.

The design is based on a simple STM32F0 microcontroller. It can handle NeoPixel and DotStar protocols, and the power supply can vary from 5V to 15V.

Firmware available at https://github.com/fearedspark/RGB_LED_Strip_Controller

OSH park permalink: https://oshpark.com/shared_projects/Fg2xQq0t

RGB LED Strip Controller – [Link]

 

Automatic monitor brightness controller

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Dilshan Jayakody build a auto monitor brightness controller that adjusts your monitor brightness according to lighting conditions. He writes:

The sensor unit of this system is build around PIC18F2550 8-bit microcontroller. To measure the light level we use LDR with MCU’s inbuilt ADC. The control software of this unit is design to work with Microsoft Windows operating systems and it use Windows API’s DDC/CI related functions to control the monitors/display devices.

Automatic monitor brightness controller – [Link]

Open Source Pick and Place Machine

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Peter van der Walt @ OpenHardware.co.za has published his newest machine design – an open source pick and place machine.

Open Source Pick and Place Machine – [Link]

Basics of Near Field RF Probes

Near Field RF probes can be very helpful when tracking down sources of unwanted RF emissions or radiation. This video presents the basics of the E-Field and H-Field probes, how they work, and how to use them.

Basics of Near Field RF Probes – [Link]

Wearable sensors analyze your sweat

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Engineers at the University of California are focusing on measuring Sodium, Potassium, Glucose, Lactate in an attempt to measure an individual’s health. The team have developed a prototype that comprises a flexible printed circuit board holding five sensors.

A new device is able to calibrate the data based on skin temperature and transmit the information wirelessly in real time to a smartphone. The results of a new study of the wearable technology have been published in the journal Nature.

Wearable sensors analyze your sweat – [Link]

28.8MHz TCXO with +-1ppm Stability

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Craig document his process of building a Better RTL-SDR TCXO with +-1ppm stability over 0C-55C range.

Its hard to beat the cost and versatility of the ubiquitous RTL-SDR dongles, but the temperature stability of their reference oscillators isn’t sufficient for some applications. While the internal 28.8MHz quartz crystal in these units can be replaced by a high quality temperature compensated oscillator, these tend to be relatively expensive and/or difficult to source.

28.8MHz TCXO with +-1ppm Stability – [Link]