555 Based DC Motor Speed Controller

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555 DC Motor Speed Controller project will control the speed of a DC motor connected to it. This project is built using the popular 555 timer IC.

Specifications

  • Power supply input 5-12V DC
  • Motor Load Up to 1 to 2Amps
  • Onboard preset to vary Duty Cycle from 10% to 95% @ 120 Hz
  • Ideal for mini drill and robotics application
  • Transistor based output drive with heat-sink
  • Diode protection for motor surge
  • Power-On LED indicator
  • Screw terminal connector for easy power supply input and output-Motor connection
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 47 mm x 56 mm

555 Based DC Motor Speed Controller – [Link]

Sparkfun: First Impressions of the ESP32

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Jimb0 @ sparkfun.com takes a first look on the new ESP32 WiFi board by Espressif that’s an improvement of the ESP8266 board.

The ESP32 doesn’t replace the ESP8266, but it does improve on it in every aspect. Not only does it have WiFi support, but it also features a Bluetooth 4.2 radio, making it even more versatile. The CPU is similar to the ESP8266 – it’s a 32-bit Xtensa® LX6, but the ESP32 has two cores! There’s also 128KB of ROM and 416KB SRAM, but Flash memory (for program and data storage) is still left up to an external chip (up to 64MB).

Sparkfun: First Impressions of the ESP32 – [Link]

SCIO: The Fun New Way To Learn Coding, Computers and STEM

SCIOA new board that aims to fill an education gap for programmable boards is on kickstarter. SCIO enables anyone, without the need of previous experience, to experiment with electronics and coding and build various projects based on onboard sensors, work on the cloud, make light shows and even more.

Within an hour of opening the box, someone who previously knew nothing about computers, programming and “boards,” can write programs that explore, educate, and entertain.

When someone buys a Raspberry Pi or Arduino without any prior programming experience, this person often reports being lost because they do not have the technical skills to use it. The information available for programming and using these devices is often difficult to understand for beginners.

SCIO: The Fun New Way To Learn Coding, Computers and STEM – [Link]

A new form of retina implant returns sight to the blind

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A team of scientists at Oxford Eye Hospital aim to create a bionic eye, that will make people who lost their sight to see again. A special chip is placed behind the retina and a small processor sends signal to the optic nerve and brain process it thus enabling the person in treatment to see.

In Lewis’ case, after just two days of tests, she was able to make out basic shapes and see outside for the first time in over a decade.

It helped that in her case, Lewis’ optic nerve was still intact. But it still took some time for her brain to adjust to actually seeing for the first time in years. The first test was to see blinking lights on a computer screen, which she passed with ease. But when it came to discerning a white plate on a black table cloth, not so much. Trying to not feel overly defeated, Lewis came back the next day and was able to make out the shape, and more.

A new form of retina implant returns sight to the blind – [Link]

Lithium-Ion Battery Warms Up, Operates In Subzero Temperatures

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Charles Q. Choi @ spectrum.ieee.org discuss about a new type of li-ion battery able to work in low temperatures.

A new “all-climate” lithium-ion battery can rapidly heat itself to overcome freezing temperatures with little sacrifice in energy storage capacity and power, researchers say.

This advance might enable applications for which high-performance batteries are needed in extremely cold temperatures, such as electric cars in cold climates, high-altitude drones, and space exploration. EC Power is now creating all-climate battery cells in pilot-production volumes that can be put directly in vehicles, says study lead author Chao-Yang Wang, a mechanical and electrochemical engineer at Pennsylvania State University.

Lithium-Ion Battery Warms Up, Operates In Subzero Temperatures – [Link]

Battery Powered Frequency Meter (0 to 20kHz)

The circuit is a simple digital frequency meter that is made of a frequency-to-voltage converter and an analog-to-digital display converter that can be operatedfrom a single 9-volt battery. The TC7126 ADC generates the voltage required by the TC9400 FVC with internal regulators. The TC7126 is designed to directly drive a 3-1/2 digit, non-multiplexed LCD display so no digital conversion is required.

The input circuit is made up of a current limiting resistor (33kΩ), a DC blocking capacitor (0.01µF), a clamping diode (1N914), and a biasing resistor (1MΩ). The diode acts as a soft clamp to prevent negative going transitions from latching the comparator input and the 33kΩ resistor limits the current during the positive transitions. The gain (VOUT vs. FREQIN) of the TC9400 is determined by the charge-balance capacitor and the integrator feedback resistor (620kΩ) that has been selected for an output of approximately +2V (referenced to ANALOG COMMON) with frequency input of 20kHz. The bias resistor (12kΩ) determined the input threshold of the comparator and has been selected for an input sensitivity range of 250mV to 10V peak-to-peak of a sine or square wave on the input of the FVC.

The TC7126 will have a maximum positive input of about 2V since the input is referenced to ANALOG COMMON that is only 3V below V+. The internal voltage swing of the integrator does not have the same limitation because a positive input results in a negative swing of the integration. A fully charged battery will give a range of about 6V. The integration components (1MΩ and 0.047µF) at pins VBUFF and VIN are selected, in conjunction with the oscillator frequency to have an integrator ramp amplitude of about –3V with a 2V input from the TC9400. The oscillator is set up to run at 48kHz (150kΩ and 50pF) for maximum rejection of stray power-line pickup. This will result in the TC7126 running at three conversions per second.

Battery Powered Frequency Meter (0 to 20kHz) – [Link]

Microchip to Buy Atmel for Nearly $3.6 Billion

 

MicroAtMelChipMicrochip Technology to Buy Atmel for Nearly $3.6 Billion @ The New York Times.

Microchip Technology agreed to acquire a fellow chipmaker, the Atmel Corporation, for about $3.6 billion, part of a wave of mergers and acquisitions within the semiconductor industry.

Chip makers have been combining to cut costs and build scale for their customers. Microchip agreed to acquire the 37-year-old chipmaker Micrel in May for about $839 million. Microchip purchased Supertex for $394 million in 2014, and the year before that, bought the closely held Brussels-based EqcoLogic for an undisclosed amount.

Microchip joins larger peers in this round of consolidation, including Avago Technologies, which agreed to acquire Broadcom for $37 billion, one of the biggest deals ever within the semiconductor industry.

Microchip to Buy Atmel for Nearly $3.6 Billion – [Link]

Arduino Distance Meter

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Paoson Woodwork @ instructables.com has build an Arduino Based Distance meter using SR-04 Ultrasonic sensors and an LCD display:

This a project I’ve been working for some time now. It is a device that shows in a little LCD display the distance to the nearest object it can find, usually the floor, the ceilling and two walls or columns. So it can be so helpful to hang a picture, a shell, a light point, calculate the area of the entire wall, etc.
The sr04 has a 3mm resolution, so I am only using it in entire centimeters. You can also change it to inches pressing a button but then the resolution is even worse. I am trying to figure out how to get a better resolution, I know it is possible. Needless to say any help will be appreciated.

Arduino Distance Meter – [Link]

RELATED POSTS

Samsung presents a bio-processor that wishes you well

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by Denis Meyer @ elektormagazine.com writes about the new Samsung bio-processor:

Samsung Electronics Co. announced recently the production in quantity of their versatile biometric IC with which the Korean giant is responding to the new trend towards quantifiable health. The Bio‑Processor was conceived to enable rapid development of innovative portable systems for the daily monitoring of the health of users. Samsung says it is the first all in one IC solution for the health market. Apart from the Microcontroller itself, the power control circuit (PMIC), the digital signal processor (DSP) and the flash memory, no less than 5 analog front ends (AFE) are integrated on chip: a bioelectrical impedance sensor (BIA), a photoplethysmography (PPG) (a technique for non-invasive vascular function analysis), an electrocardiograph (ECG), a skin temperature sensor and a Galvanic Skin Response (skin conductance) sensor (GSR).

Samsung presents a bio-processor that wishes you well – [Link]

Plastic fingerprint sensor also detects underlining veins

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FlexEnable, the leader in the development and industrialisation of flexible organic electronics, and ISORG, the pioneer in organic photodetectors and large area image sensors in printed electronics, have revealed the world’s first large area flexible fingerprint sensor on plastic designed for biometric applications. With an 8.6 cm x 8.6 cm active area, 84µm pitch (78µm pixel size with 6µm spacing) and 1024 x 1024 = 1048576 pixel resolution, this revolutionary flexible sensor is only 0.3 mm thick and can operate in visible and near infra-red up to wavelengths of 900 nm. The technology is capable of measuring not only the fingerprint, but also the configuration of veins in the fingers, providing additional security versus that of a surface fingerprint alone.

Plastic fingerprint sensor also detects underlining veins – [Link]