Having many 18650 battery cells to charge, I bought a few dirt cheap TP4056 modules (0.22 EUR per piece) and discovered that they are “not designed for” reversed polarity cells. In other words, reversed battery = instant magic smoke. As I know for sure I will insert more batteries in the wrong orientation again sooner or later, I…
A beacon will continuous broadcast signals to let other bluetooth devices know the presence of it. And I’ve always wanted to have a bluetooth beacon to track my keys since I’ve already forgot to bring them like 10 times last year. And I happendly got a HM13 dual module. So I think I could…
https://youtu.be/kgY40e9mi8w The Cassette Pi is a self-contained real-time notification scroller, all housed neatly inside a transparent cassette tape. A Raspberry Pi Zero is sandwiched between the two tape reels, retrieving all manner of Internet of Things notifications from the fabulous IFTTT (If This, Then That) service, delivered almost instantly to the Pi via an Adafruit.IO feed and a…
We introduced this concept last year, and have launched three games so far. Our final game of 2019 was SumoBots Battle Royale — where players from anywhere in the world can fight real robots in a battle royale-style arena. The aim of the project was to have the game run semi-autonomously, meaning that the…
Researchers in Thailand have developed a ZigBee-based wireless monitoring solution for off-grid PV installations capable of tracking the sun across the sky, tilting the panel hourly. The elevation for the setup is adjusted manually once per month for optimum energy collection. The prototype is controlled by a local Arduino Uno board, along an H-bridge motor driver to…
Complete charger in breakout board format based on the integrated BQ76920, capable of managing 3 to 5 cells. The charging of lithium batteries, whether common Li-ion, LiPo or LiFePO4, requires particular precautions that make it more difficult and delicate than it is in accumulators such as lead batteries (for which it is enough…
Measure wind, rain, temperature, humidity, and light in remote locations using ThingSpeak, Particle, and the Sentient Things IoT Node. This project describes the latest generation of a weather station used by the ThingSpeak team at MathWorks (see ThingSpeak Weather Station & Data Analysis for an earlier version). This weather station provides the following improvements: Optional solar…
Design beautiful customizable luminary lanterns for your home or garden. Cut them out on a vinyl cutter or laser cutter, and fill them with light using a Circuit Playground Bluefruit Express and Adafruit’s NeoPixel rings. Add custom color animations and control the lanterns with Adafruit’s BlueFruit app. More info
Have you tried to test a battery capacity? How much was it difficult? Now a new DIY instrument allows you to identify a fake Lithium-Ion/Lithium-Polymer/NiCd/NiMH battery. You can also see on the LCD user interface to check the capacity of almost any kind of battery whose voltage il less than 5V. More info
Solar power has become cheaper than grid electricity across China, a development that could boost the prospects of industrial and commercial solar, according to a new study. Projects in every city analysed by the researchers could be built today without subsidy, at lower prices than those supplied by the grid, and around a fifth…
Let’s take a closer look to battery chargers for electric cars provided by manufacturers. Those who have an electric car or at least a hybrid plug-in car (i.e. externally rechargeable) or whoever is in any way interested in the subject, will surely already know about them. They are also called Wall Boxes, EV Chargers,…
The Wii Nunchuk controller is the notorious official Nintendo Wii controller with two buttons, a joystick, and an accelerometer, which makes it pretty versatile. Thingiverse Keycaps wanted to take advantage of the Joystick’s motion capabilities for a unique application, and so they stuffed a Raspberry Pi Zero W inside one. The Pi Zero is small, but…
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