ESP8266 Standalone WiFI Relay Control

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In this tutorial you will learn how to use ESP8266 in standalone mode to control a relay via Web-UI. The ESP broadcasts its own SSID and there is no need to connect to a router.

ESP8266 Standalone WiFI Relay Control – [Link]

AmpStrike – Battery Powered Bench Power Supply

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This is a small bench power supply that is powered by two lithium-ion batteries. The project was inspired by Dave Jones from EEVblog but the design is completely mine. The voltage range is 0-20V regulated in 10mV steps and maximum current is 1A with current limit set in 1mA steps.

The power supply runs on a linear voltage regulator built on discrete components. The design of the linear regulator was inspired by the user Amspire from the EEVblog forum. The basic idea is that the Q1 pass transistor and U5A op amp act in a classic voltage regulating loop. U5A gets feedback from the output voltage and acts on Q1 in such a way that the output voltage equals the reference voltage on the inverting input. U5D acts as a comparator and switches the base of Q1 low to set the output voltage to 0V. It acts as a current limiter which is quickly switching on and off the output to maintain the set current limit.

AmpStrike – Battery Powered Bench Power Supply – [Link]

High-performance scope probes top out at 20 GHz

Tektronix, Inc., the world’s leading manufacturer of oscilloscopes, introduced the P7700 series of TriMode™ probes for use with Tektronix performance oscilloscopes. Offering up to 20 GHz bandwidth, the new probes ease the challenges designers face when debugging circuits found in the latest mobile and enterprise designs by minimizing probe loading, improving access to smaller, more-densely packed test locations and lowering overall cost of ownership.

The new P7700 series of probes from Tektronix takes a completely different approach, with the input amplifier integrated into the probe tip less than 4 mm from the connection point. This minimizes signal loss as well as probe capacitance and reduces noise susceptibility.

With prices starting at $8,500, the P7700 probes are intended for professional users.

High-performance scope probes top out at 20 GHz – [Link]

21.1% efficiency with Perovskite solar cells

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Scientists have successfully developed a Perovskite solar call containing Cesium which has attained an efficiency of 21.1%, as well as a world record for reproducibility. by Denis Meyer @ elektormagazine.com:

In adding Cesium, the scientists at EPFL, let by Michael Saliba, have developed the first Perovskite compound with triple cations (Cs/MA/FA). These new films are more stable in hot conditions and less affected by fluctuations in environmental variables. They have confirmed efficiencies of 21.1%, and exit efficiency of 18% in operational conditions, even beyond 250 h.

21.1% efficiency with Perovskite solar cells – [Link]

An Electrocardiograph business card

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Peter Isza has designed and produced an amazing electrocardiograph business card and open sourced the design files.

MobilECG II is an open source clinical grade Holter ECG. For more information, please visit http://mobilecg.hu

An Electrocardiograph business card – [Link]

‘Circuit Cobbling’ the Riffle Data Logger

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John Keefe has designed an open source data logger that is able to monitor conductivity, temperature and turbidity of water in lakes and fits inside a plastic bottle.

The board is designed to monitor the conductivity (and, possibly, contamination) of water in lakes and streams, with the wonderful feature that it fits through the mouth of a regular water bottle. It’s called Riffle and it is the brainchild of Don Blair, who’s working with Public Lab and the MIT Center for Civic Media. This week I had the honor of working with Don at MIT.

‘Circuit Cobbling’ the Riffle Data Logger – [Link]

Get ready for MPLAB Express

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Chas from iradan.com discuss about MPLAB Express, the new cloud IDE from Microchip for PIC microcontrollers. He writes:

I credit the maker movement with bringing electronics back from the crusty old and lonely electronics hobby back into the main stream. The Arduino is the micro of choice for this army of makers and I conceded it made sense… you install the IDE, plugged in your board into the USB port and a couple clicks later and you have an LED blinking.. the most exciting blinking LED you’d ever seen in most cases. I stuck with the PIC micros because I didn’t see any need to put back on the training wheels.

Get ready for MPLAB Express – [Link]

Monolithic linear battery charger operates from inputs up to 60V

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Joshua Yee @ edn.com discuss about LTC4079 250mA Linear Li-Ion Charger IC that can be powered with voltages up to 60V.

For charging relatively low capacity batteries, or maintenance charging backup and keep-alive batteries, linear topology battery chargers are valued for their compact footprints, simplicity and affordability. Even so, there is a dearth of linear chargers that accept a 10V or higher input voltage, leaving many industrial and automotive systems underserved.

Monolithic linear battery charger operates from inputs up to 60V – [Link]

LT8391 – 60V Synchronous 4-Switch Buck-Boost LED Controller

LT8391

The LT8391 is a synchronous 4-switch buck-boost LED controller that regulates LED current from input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 150kHz to 650kHz fixed frequency operation, or internal ±15% triangle spread spectrum operation for low EMI. With 4V to 60V input, 0V to 60V output, and seamless low noise transitions between operation regions, the LT8391 is ideal for LED driver and battery charger applications in automotive, industrial, and battery-powered systems.

LT8391 – 60V Synchronous 4-Switch Buck-Boost LED Controller – [Link]

 

Wireless communication between two Arduinos using inexpensive RF modules

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Raj from Embedded Lab has posted a new article exploring an easy wireless communication setup between two Arduinos using low-cost ASK RF transmitter and receiver modules. He used a 433MHz Tx/Rx pair with two Arduino boards to illustrate how to construct a low-range wireless temperature and humidity monitor.

Wireless communication between two Arduinos using inexpensive RF modules – [Link]