Category Archives: Featured


Elecrow launches Crowbits: Electronic Blocks for STEM Education

With the grand success of CROWPI2, an all-in-one portable Raspberry Pi Laptop development platform, Elecrow has now come up with Crowbits: easy-to-use electronic building blocks for young inventors. Crowbits include more than 80 modules that can be easily snapped through built-in magnets to create projects. It also incorporates a graphical programming software -Letsocde, where users can simply drag and drop blocks to develop applications.

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Meet CrowPi2: An all-in-one portable Raspberry Pi laptop for STEAM learning and rapid prototyping

When it comes to STEAM (Science, technology, engineering, art and math) education, the Raspberry Pi is perhaps the most affordable, powerful, and versatile learning tool for all ages and skill levels. The versatility of this little computer comes from its incredible interconnectivity feature that offers direct connection of sensors and electromechanical components, thereby allowing the users to learn embedded hardware and programming in a very simple and engaging way. Since it first came out in 2012, the Raspberry Pi has been the most adventurous tool of teachers in the classroom to foster learning, awareness of computer programming, and extend the

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Making a SPL dB Meter

In the 1980s, there was no internet as like today and so the sources of entertainment were televisions, radios and cassette players. When I was a kid, we had an audio cassette player. We used it to play songs but my imagination was always fixed to its VU meter display with its fancy readings as shown below. It changed with the volume of the speakers and matched rhythmically with the sound coming out of it. During my engineering career, I got to know about the Decibel scale and sound pressure measurement. It soon became a goal for me to design

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Tutorial 9: ESP8266 and WS2812B RGB LED (or NeoPixel) ring

This tutorial describes how to interface a WS2812B RGB LED ring or Adafruit’s NeoPixel ring to ESP8266. The WS2812B is a smart RGB LED with a control circuit integrated in a 5050 SMD package. The RGB data transfer occurs through a single data input line using single NZR communication mode. Connection between the NeoPixel ring and ESP8266 is through a single data wire. I am using EasyESP-1 here for illustration. The Data In (DI) line of the NeoPixel ring connects to D1 pin of EasyESP-1. VCC and GND pins go to 3.3V and GND terminals of EasyESP-1. I used a 40 RGB LED NeoPixel-compatible LED

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Programmable LED dimmer using PIC16F18325

LUKAS FÄSSLER designed a versatile programmable LED dimmer using PIC16F18325 MCU to drive white and RGB LEDs. It operates at a wide range of power supply (6 to 26 volts) and utilizes MOSFET drivers with non-inverting outputs. The mosfet drivers are basically the same as before but now with non-inverting outputs: LM5111-1M. There are two of them for a total of 4 outputs compared to only 3 with the previous version. They now drive much (physically) smaller but no less capable mosfets which allowed me to significantly downsize the whole board to 75x65mm.  The NXP BUK9Y12-40E are rated at 40

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