Li-Fi – 200 Gbps via your room light


Thijs Beckers @ has some great news about the Li-Fi technology:

The French company Oledcomm displayed its technology at the Mobile World Congress in Barcelona (22-25 Feb 2016), where a smart phone is connected to the Internet using only an LED lamp, which reaches a connection speed that is a 100 times faster than the current Wi-Fi standard. The ‘Li-Fi’-connection, Li-Fi means ‘light fidelity’, achieves, in laboratory situations, speeds of more than 200 Gbps, in theory fast enough to send the data contents of 23 DVDs in one second, according to Oledcomm founder Suat Topsu (according to our calculations 200 Gbps comes closer to 5 DVDs, but that aside).

Li-Fi – 200 Gbps via your room light – [Link]

OpenGarage – Open-source WiFi garage door opener

Ray Wang has published a new project called OpenGarage, an open-source garage door opener based on ESP8266 and the Blynk app:

Today I am very excited to introduce you to OpenGarage — an open-source, universal garage door opener built using the ESP8266 WiFi chip and the Blynk app. I’ve wanted to finish this project for a while, as there have been multiple occasions where I left the house in a hurry and forgot to close my garage door, or locked myself out of the house, or had to let a friend or handyman in while I was away. Having a WiFi-based garage door opener (which I can access remotely using my mobile phone) would be super convenient. Recently as I started learning about ESP8266, I found it to be the perfect platform to help me complete this project.

OpenGarage – Open-source WiFi garage door opener – [Link]

nRF24L01+ 2.4 GHz wireless connectivity with the TinyK20 board


Erich Styger show us how to connect nRF24L01+ transceiver module with tinyK20 Board and how to use the command line to communicate with it. He  writes:

I’m using the tiny and inexpensive Nordic Semiconductor nRF24L01+ transceiver (see “Tutorial: Nordic Semiconductor nRF24L01+ with the Freescale FRDM-K64F Board“) in many projects: it costs less than $3 and allows me to communicate with a proprietary 2.4GHz protocol in a low power way (see “IoT: FreeRTOS Down to the Micro Amps“). I have that transceiver now running with the tinyK20 board too.

nRF24L01+ 2.4 GHz wireless connectivity with the tinyK20 board – [Link]

1.2V to 37V Regulated Power Supply – 1.2A


This project provides a variable output power supply ranging from 1.2 to 37 V @ 1.5 A. Uses industry populer LM317 in TO3 package for delivering variable output voltage.


  • Input 40 VDC or 28V AC 2Amps
  • Output : 1.2 to 37 V @ 1.5 A regulated low ripple DC voltage
  • Heatsink for regulator IC
  • Onboard bridge rectifier to convert AC to DC
  • LED indication at input of IC
  • Thermal overload/short circuit protection (provided by IC feature)

1.2V to 37V Regulated Power Supply – 1.2A – [Link]

Software Defined Radio (SDR) shield for Arduino


by Clemens Valens @

The new SDR board was created by Burkhard Kainka, the designer who also did the first SDR project. The antenna preselector of the original board has been removed while the CY27EE16 programmable oscillator was replaced by the Si5351 from Silicon Labs. The Arduino board takes over the functions of the FT232R USB interface in the original design.

Software Defined Radio (SDR) shield for Arduino – [Link]

LTC4125 – 5W AutoResonant Wireless Power Transmitter


The LTC4125 is a simple and high performance monolithic full bridge resonant driver capable of delivering over 5W of power wirelessly to a properly tuned receiver. The device controls the current flow in a series connected transmit coil LC network to create a simple, safe and versatile wireless power transmitter.

The LTC4125 wireless power transmitter improves upon a basic transmitter by providing three key features: an AutoResonant function that maximizes available receiver power, an Optimum Power Search algorithm that maximizes overall wireless power system efficiency, and Foreign Object Detection (FOD) to ensure safe and reliable operation when working in the presence of conductive foreign objects.

LTC4125 – 5W AutoResonant Wireless Power Transmitter – [Link]

Open-source OBD adapter


Alex @ has published a new open source OBD adapter which provides you a serial interface using the ELM327 command set and supports all OBD-II standards.

The adapter kit schematic is shown here. It is built around NXP LPC1517 Cortex-M3 microprocessor with 64 kB program memory, but can accommodate another chip from same family like LPC1549 with 256 kB if required. The NXP chips has a ROM-based bootloader that supports loading a binary image into its flash memory using USART or CAN. All the software is written in C++ for NXP LPCXpresso IDE which is essentially using GNU toolchain for ARM Cortex-M processors. However, it can be compiled with other pre-built GNU toolchain, like GCC ARM Embedded or even with Keil uVision IDE.

Open-source OBD adapter – [Link]

How to measure mass of the Earth using Arduino


victoryking @ has posted a nice physics and arduino tutorial on how to measure the mass of earth. This is an indirect method to calculate the mass of earth by measuring acceleration due to gravity with the help of arduino.

One fine day, I was weighing my self on a weighing scale. Suddenly a thought came to my mind, ‘How much would be the mass of Earth?’. Leave that apart ‘How can we even measure it?’. There is no such weighing scale on which, Earth can be placed. There has to be some indirect way to measure mass of the Earth. Here I present implementation of one such indirect method to measure mass of the Earth.

How to measure mass of the Earth using Arduino – [Link]

FeatherHAB (Balloon Tracker) Firmware & Hardware Source Released


Ethan Zonca has released the firmware and hardware of FeatherHAB. FeatherHAB is a small and inexpensive ballon GPS tracker.

FeatherHAB is a lightweight, small, and inexpensive balloon tracker. It tracks the location of a balloon with GPS and broadcasts the balloon’s position to the APRS network on 144.390MHz. The tracker is built around a Ublox MAX8 GPS module and a custom RF transmitter designed with the Silicon Labs Si446x transceiver IC. Power is supplied by a single-cell Lithium battery, which runs through a tiny buck-boost converter to power the system. The total weight comes in at about 2 grams without a battery.

FeatherHAB (Balloon Tracker) Firmware & Hardware Source Released – [Link]