Measure Stress Levels Using a Smartphone
Technology

Measure Stress Levels Using a Smartphone

Researchers have developed a smartphone device that measures the cortisol concentration in saliva in order to define your stress levels. The new test is done in under 10 minutes and there is no need to send a salvina sample on a lab. The cost for each measurement is less than 5$...

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A biometric sensor for wearables – LG Innotek
Sensor

A biometric sensor for wearables – LG Innotek

LG Innotek has released an ultra-thin optical biometric sensor module designed to be used in wearables and smartphones to measure health parameters such as heartbeat, stress indicators and blood oxygen saturation level. The new sensor is more accurate than it's predecessors...

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SolarBoost – Make Your Own USB Solar Mobile Charger
Photovoltaic

SolarBoost – Make Your Own USB Solar Mobile Charger

SolarBoost is an open source smart interface that allows you to build your own powerful and portable solar charger for your phone and other mobile devices. It has two USB ports and can provide 5V @ 2A at each of them and is controlled by a 8-bit 32MHz Microchip PIC microcontroller. It...

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Ryet IKEA LED Bulb teardown
Led

Ryet IKEA LED Bulb teardown

Here is a quick tear down of an IKEA 400 lm "Ryet" bulb. Cheapest bulb with full safety listing that I have ever seen. Selling for less than $2.00! Ryet IKEA LED Bulb teardown -...

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UP/DOWN counter with memory using PIC16F88
Mcu

UP/DOWN counter with memory using PIC16F88

Here is an up-down counter based on PIC16F88 and 7-segment display. The counter is using SMD components and features a RS-232 interface. This is a simple digital counter with a serial rs-232 and a 7 segment display, i started this project to count items on some shelfs, but it can be...

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Choose the right step-up/down voltage regulator for portable applications
Power supply

Choose the right step-up/down voltage regulator for portable applications

Reno Rossetti & Inyong Kim discuss about the power needs on portable devices and help us choose the right regulator. A popular power source for portable devices is a single lithium-ion cell with 4.2V at full charge and 2.8V at end of discharge. However, some functions within...

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LTC7813 – Low IQ, 60V Synchronous Boost+Buck Controller
IC

LTC7813 – Low IQ, 60V Synchronous Boost+Buck Controller

Linear Technology Corporation introduces the LTC7813, a dual output (boost + buck), low quiescent current synchronous DC/DC controller. When cascaded, its independent step-up (boost) and step-down (buck) controllers regulate the output voltage from an input voltage that can be above,...

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Open-source microprocessor
Technology

Open-source microprocessor

Fabio Bergamin @ phys.org writes about PULPino which is an open source processor to be used on wearables and IoT. In future, it will be easier and cheaper for developers at universities and SMEs to build wearable microelectronic devices and chips for the internet of things, thanks...

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