9 VDC Regulated Power Supply

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Tiny low current 9 VDC Regulated Power supply designed around bipolar transistor and zener diode. The circuit is known as series voltage regulator or emitter follower voltage regulator. The unregulated supply fed to input and the circuit regulate the voltage and provide constant 9V DC, 250mA. The zener diode provides the reference voltage to the base of the transistor. This is very suitable power supply for small projects as it can provide any supply output by changing just the zener diode.

Other output voltage can be obtained by changing the zener diode

Output Voltage Formula Vout=Vz-VBe

Vz=Zenner diode Voltage, VBe=0.7V

9 VDC Regulated Power Supply – [Link]

Easy Pulse mikro – MikroBus form factor pulse sensor

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Raj @ embedded-lab.com has designed a new version of his Easy Pulse Sensor. This revision is an add-on board in mikroBus form factor, which enables easy integration with mikroElektronika‘s numerous development boards. It also operates on the principle of transmittance photoplethysmography applied to a fingertip using infrared sensors.

Easy Pulse mikro provides all necessary instrumentation and amplification on board to detect the cardiovascular pulse signal from the fingertip. The output is a nice and clean analog PPG waveform that is routed to the AN pin of the mikroBus connector. Currently, you can buy this sensor from our Elecrow Store.

Easy Pulse mikro – MikroBus form factor pulse sensor – [Link]

Berkeley Lab makes graphene-MoS2 transistor

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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 @ edn-europe.com

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.

LCD 16×2 Interface with Raspberry Pi

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shubhamtrivedi95 @ instructables.com shows how to interface a 16×2 LCD display on Raspberry Pi. Sample code is provided.

LCD 16×2 Interface with Raspberry Pi – [Link]

Arduino + Thermocouple + Nokia 5110 LCD

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abhyu1112 @ instructables.com 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

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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

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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

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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

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by Julien Happich@ edn-europe.com

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

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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]