Berkeley Lab makes graphene-MoS2 transistor


U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) has developed a way to assemble transistors based on the 2D materials graphene and molybdenum disulfide. By Peter Clarke @

The method etches narrow channels in conducting graphene laid down on a silicon-dioxide substrate. These channels are then filled with a transition-metal dichalcogenide, or TMDC, or more specifically MoS2. Both of these materials have a 2D structure that is just one atomic layer thick. The synthesis method was able to cover an area a few centimeters long by a few a millimeters wide opening up the possibility of commercial-scale production in a wafer fab on a silicon wafer.

Arduino + Thermocouple + Nokia 5110 LCD


abhyu1112 @ provides code for thermocouple interface to Arduino and Nokia 5110 LCD display.

This is a connection between arduino mega thermocouple and Nokia 5110 screen to display temperature which ranges till 1000*C. It can be used to measure temperature of engine.

Arduino + Thermocouple + Nokia 5110 LCD – [Link]

TritiLED – Multi-year always-on LED


Ted Yapo has designed a multi-year always-on LED replacements for gaseous tritium light sources.

TritiLEDs are always-on battery powered LED glow lights for general night-time marking use. Radioactive gaseous tritium light sources (GTLSs) are allowed in the United States in several consumer product categories, including watches, compasses, and gun sights, but general-purpose markers are considered “frivolous” and are prohibited. Levaraging advances in LED efficiency, battery capacity, and microcontroller technology, TritiLEDs run from 1 to 15 years depending on battery choice, and while larger than typical GTLSs, can replace expensive and sometimes illegal tritium lighting in a variety of applications (including the fivolous). Version 1.0 of the hardware and software is complete and released under an open-source (CC-BY-SA) license. Versions 1.1 and 2.x are works-in-progress and will be documented here as they are developed.

TritiLED – Multi-year always-on LED – [Link]

Factory programming ESP8266 gadgets


Johan Kanflo’s Esprog pogo pin connector:

The FTDI connector can be found on just about any ESP8266 design. If you are building a gadget to be deployed somewhere and not a full blown development board, the FTDI connector is somewhat overkill. And it is quite large. A few pins could be shaved off but we still have a through hole connector invading the other side of the PCB.  I ended up designing my own connector and it has been used sucessfully in all of my recent projects.

Factory programming ESP8266 gadgets – [Link]

ESP8266 based plane spotter


A how-to on building an ESP8266 based plane spotter from Daniel Eichorn:

In order to get this project running you’ll need the following list of hardware:

  • NodeMCU ESP8266 module or Wemos D1 Mini
  • 0.96″ SSD1306 OLED display
  • A few connectors and USB Wire
  • Or order a complete starter kit from my shop

ESP8266 based plane spotter – [Link]

850nm infrared LED outputs 770mW at 1A


by Julien Happich@

Designed for infrared illumination for cameras, surveillance systems or machine vision, the Oslon Black SFH 4715A infrared emitting diode (IRED) boasts a low thermal resistance of maximum 11K/W, delivering a 850nm beam with an optical output of 770mW at 1A

Higher outputs can be achieved with stack versions, in which two emission centers are provided per chip. The device features a low component height of 2.3 mm.

The device is ESD safe up to 2 kV and will soon be qualified to AEC-Q101-REV-C for automotive use.

Heat Activated Cooling Fan Controller


Heat activated cooling fan controller is a simple project which operates a brushless fan when the temperature in a particular area goes above a set point, when temperature return normal, fan automatically turns off. The project is built using LM358 Op-amp and LM35 temperature Sensor. Project requires 12V DC supply and can drive 12V Fan. This project is useful in application like Heat sink temperature controller, PC, heat sensitive equipment, Power supply, Audio Amplifiers, Battery chargers, Oven etc

Heat Activated Cooling Fan Controller – [Link]

Limiting Inrush Current

limiting_inrush_current has a basic article on how to limit inrush current using passive components.

Inrush current or input surge current refers to the maximum, instantaneous input current drawn by an electrical device during its initial turn on.

Power converters also feature high inrush currents relative to their steady state currents that may be several times their normal full-load current when first energized.

The inrush current of a power converter is typically the charging current of the input capacitance.

Limiting Inrush Current – [Link]

Wireless mood light with Arduino & BLYNK


sagnikb7 @ show us how to build a wireless mood lamp using Arduino and BLYNK app.

In this tutorial we will be creating a MOOD (you can create any color you can imagine to fit your mood) light, that can be controlled from your smartphone, we will be creating the APP too (NO ANDROID APP CODING required)

Wireless mood light with Arduino & BLYNK – [Link]