Motion sensor offers low-power settings

Susan Nordyk @ writes:

Small enough for wearable devices, STMicroelectronics’ LIS2DW12 three-axis accelerometer draws only 50 nA in standby mode and 380 nA in low-power mode at a 1.6-Hz output data rate, adding negligible load on the battery. Operating from a supply voltage of 1.62 to 3.6 V, the LIS2DW12 enables extended operation from small coin or button cells.

Motion sensor offers low-power settings – [Link]

Full-360˚ angle sensor ICs

by Graham Prophet @

Allegro MicroSystems has added two 0˚ to 360˚ angle sensor ICs that provide contactless high-resolution angular position information based on magnetic Circular Vertical Hall (CVH) technology. Allegro has incorporated advanced diagnostics to support safety-critical automotive and industrial uses.

Simple 3 phase Arduino energy meter

Simple 3 Phase Arduino energy meter from The DIY Life:

Again, with this meter I was going for simplicity. Sure, for perfectly accurate measurements you need to measure both the supply current and voltage but for this application and in the interests of keeping the energy meter simple and safe – only requiring a non-contact connection to your mains – I’ve decide to stick with a simple current measurement which gives you an estimate to within a couple of decimal points of a kilowatt hour.
This meter measures the supply current through each phase using a CT (current transformer) and then does a few calculations to give you the current, power, maximum power and kilowatt hours consumed for each phase.

Simple 3 phase Arduino energy meter – [Link]

IoT based remote heart rate monitoring system

With the advent of IoT technologies and decreasing cost of wireless sensors, the use of remote healthcare monitoring systems is growing rapidly, thereby allowing health care access to more people at affordable costs. To illustrate the concept of IoT based patient monitoring, Raj from Embedded Lab has shared a project article on how to build a remote heart rate monitoring system using ESP8266 and Easy Pulse sensor. The project uses a TFT LCD to display heart beat rate and PPG waveform locally, as well as uploads the pulse rate to a Google spreadsheet for accessing the data from remote. The Google sheet’s Chart  feature allows the remote user to visually track the pulse rate variation over time.

Pulse rate and PPG waveform displayed locally on a TFT LCD
Pulse rate chart for remote access

Read details of the project here! 

Thermohygrometer with clock and LCD display on Arduino UNO

techrm @ has a tutorial on a nice thermohydrometer:

These 7 steps will drive you through the “construction” of a thermo-hygrometer with clock on Arduino UNO.

Data and time, humidity and temperature will be shown on a LCD 16×2 display .If you have purchased a LCD display and want to know how to properly solder a pin header to it, take a look at our tutorial “Yet another tutorial on how to solder”.

Each step of this tutorial is independent from the others. So, if you are looking for an easy way to make your DS3231 work (for example) this tutorial is also suitable for you.

Thermohygrometer with clock and LCD display on Arduino UNO – [Link]

The New Arduino 101 (Genuino 101) – Unboxing, Set Up, and Comparing it to the Arduino Uno

Arduino’s newest board, the Arduino 101 is finally here… It has an Intel Curie processor, and an on-board gyroscope, accelerometer, and Bluetooth. Let’s see how it stacks up to the Uno, and find out what each of the components on the board do. At the end of the video, I go through setting it up in the Arduino IDE and run a simple sketch.

The New Arduino 101 (Genuino 101) – Unboxing, Set Up, and Comparing it to the Arduino Uno [Link]

Flow battery can run for 10 years with zero maintenance

by Jan Buiting @

Harvard University researchers have developed a low-cost flow battery that stores energy in organic molecules dissolved in neutral pH water. In their report (see below) they claim that the new battery can run for a decade or more without maintenance.

Flow battery can run for 10 years with zero maintenance – [Link]

1.2V-32V @3A Variable Switching Regulator using LM317

The circuit presented here is based on LM317. Generally, LM317 is known as a linear regulator IC, but here the circuit operates as a switching regulator. This circuit operates by transferring energy
from the input to the output by using a solid state switch. Power Efficiency of a switching regulator is much higher than the linear regulators. The input voltage for this circuit is 8V-35V and it can produce the output of 1.8V to 32V, that can be varied by using potentiometer R3.


  • Input(V): 8VDC to 35VDC
  • Output(V): 1.8VDC to 32VDC
  • Output load: 3A
  • PCB:68mm X 50mm

1.2V-32V @3A Variable Switching Regulator using LM317 – [Link]

Better current with spin electronics

by Clemens Valens @

The ongoing miniaturisation of electronics is expected to reach its limits in the near future. One of the limitations is the size of electrons that are needed in electronic circuits to transport charge from one place to the other, what we usually call ‘current’. To work around this problem a team of scientists from Munich and Kyoto proposes a way to make current “better”, by using the electron’s spin instead of its charge. Enter spin electronics.

Better current with spin electronics – [Link]

FONA808 USB Interface

Jesus @ tipped us with his latest project. He writes:

For several months I’m working with FONA808 modules from Adafruit to make a portable, web-based locating system. This modules are based on the SIM808 module from SIMCOM manufacturer, and integrates both GSM and GPS transceivers in one 24x24mm package.  The Adafruit board includes this module and also some electronics for choosing voltage levels, battery connection and charger. Because I need to test and programming some of this modules, I decide to make an specific PCB for it, allowing the programming and debugging via PC, wich is more comfortable that use a microcontroller for all these tasks.

FONA808 USB Interface – [Link]