Archive for the ‘how-to’ Category

Simple 3 phase Arduino energy meter

Wednesday, March 1st, 2017

Simple 3 Phase Arduino energy meter from The DIY Life: Again, with this meter I was going for simplicity. Sure, for perfectly accurate measurements you need to measure both the supply current and voltage but for this application and in the interests of keeping the energy meter simple and safe...

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Posted in Arduino, how-to | No Comments »

Ultrasonic Transducers – measurements and horn design

Thursday, February 23rd, 2017

[embed][/embed] Lindsay Wilson writes: Over the past few years, I keep getting inquiries from people asking about how to measure the resonant frequency of these transducers, how to design horns, tune the length etc. I decided it was time to do a video about the entire process - hopefully I've...

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Programming an 8 digit 7-segment display, the easy way, using a Max7219

Friday, February 17th, 2017

Allan Schwartz shows off the easy way to interface 7-segment displays using the MAX7219: Previously, in part 1 of my blog posting Programming a 7-segment Display, using just Arduino digital pins (the hard way) we had demonstrated how to hook up a pair of 7-segment displays to an Arduino, treating...

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Posted in how-to, Interface, LEDs | 5 Comments »

Radioactivity detection using very simple ionization chamber and a single J-FET transistor

Thursday, December 29th, 2016

Robert Gawron writes: Today I will show a very simple ionization chamber that can detect radioactivity. I was able to detect with it ionizing radiation from a smoke detector (Am241 isotope). It's also immune to electromagnetic interference (EMI) due to a good shielding. This device doesn't explicitly use any power...

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G-code controlled drawing plotter

Wednesday, December 7th, 2016

A how-to on making a 2 axis, G-code controlled drawing plotter from TheSuperSewcio, project instructables here: Here I'll show you how to make 2 axis, gcode controlled drawing plotter. I've already made a delta 3D printer which is awesome, the only thing that wasn't made by me was the Arduino...

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How to run your ESP8266 for years on a battery

Thursday, December 1st, 2016

Here's a detailed article on how to run an ESP8266 for a long time on a battery by Marco Schwartz: For most of the projects I am building with the ESP8266 WiFi chip, I usually don’t care too much about the power consumption aspect. I for example build data loggers that...

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Posted in how-to | 5 Comments »

How does vacuum cleaner clean/dirty indicator work?

Wednesday, November 2nd, 2016

[embed][/embed] In this video, Kerry Wong examines how the clean/dirty circuitry from a Hoover vacuum cleaner works. Details at Kerry D. Wong blog.  

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Digipeater hardware build video

Tuesday, November 1st, 2016

[embed][/embed] Kenneth Finnegan writes: This is the hardware build of a new digipeater one of my friends asked me to put together for him. The transceiver is a GM300, with a KAM plus TNC modulating it. If we didn't happen to have a KAM+ on hand, I would have probably...

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Posted in how-to, Videos | No Comments »

Linear MOSFET and its use in electronic load

Monday, October 24th, 2016

[embed][/embed] Kerry Wong writes, "In this video, I discussed some limitations of regular power MOSFETs when operating in linear region and demonstrated the superior performance of linear MOSFETs as electronic load." More details at Kerry Wong's blog.

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Light intensity meter using AT89C52 microcontroller

Thursday, October 20th, 2016

AM Bhatt over at Engineers Garage writes: In the given project, LDR is used to measure light intensity inside the room. With a minor change in the circuit, it can be used to measure outdoor light intensity also. It uses microcontroller AT89C52 and LCD to display light intensity. It also...

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How to run C programs on the BeagleBone’s PRU microcontrollers

Tuesday, September 20th, 2016

Ken Shirriff writes: This article describes how to write C programs for the BeagleBone's microcontrollers. The BeagleBone Black is an inexpensive, credit-card sized computer that has two built-in microcontrollers called PRUs. By using the PRUs, you can implement real-time functionality that isn't possible in Linux. The PRU microcontrollers can be...

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When you need multiple analog inputs for your ESP8266 application

Monday, September 19th, 2016

Tinkermax writes: In specific situations you can get away with having only one ADC by multiplexing your sensors. In my scenario, because I was measuring totally unrelated things, this was not possible. The most obvious approach is to add an external ADC. The drawback is that this requires you to...

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PRU tips: Understanding the BeagleBone’s built-in microcontrollers

Wednesday, September 7th, 2016

Ken Shirriff writes, "The BeagleBone Black is an inexpensive, credit-card sized computer that has two built-in microcontrollers called PRUs. While the PRUs provide the real-time processing capability lacking in Linux, using these processors has a learning curve. In this article, I show how to run a simple program on the...

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DIY simple Hydrogen Generator

Tuesday, August 30th, 2016

A how-to on making a small hydrogen generator from Abedmoghari, project instructables here. Check out the video after the break. (more…)

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Posted in how-to | 3 Comments »

Mini CNC 2D plotter made from an old DVD drive and L293D motor shield

Thursday, August 25th, 2016

Sandeep_UNO posted detailed instructions of how to make this mini CNC 2D plotter using scrap DVD drive, L293D motor shield and Arduino. Project instructables here. Check out the video after the break. (more…)

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Posted in DIY, how-to | No Comments »

Biking sweeper detectors

Thursday, August 18th, 2016

Sweeper bike detectors project from Cliff Batson (N4CCB): They are equipped with a Moteino transmitter running on 9V battery power that keeps them going all day for the event, while transmitting a beacon every 4s. They beacon their identity to the various checkpoints/rest points and in sag vehicles (cars with...

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Python real-time audio frequency monitor

Monday, August 1st, 2016

Scott Harden writes, "A new project I’m working on requires real-time analysis of soundcard input data, and I made a minimal case example of how to do this in a cross-platform way using python 3, numpy, and PyQt." More details at Scott Harden's blog. All project files are on GitHub. Check...

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Walking the 32bit path to a blinky LED

Friday, July 29th, 2016

Sjaak writes: The battle isn’t AVR Atmega vs Microchip PIC anymore.. More and more people are moving to ARM chips. As easy as it sounds but it isn’t. ARM is an company that invented the ARM chips, but doesn’t has a silicon fab, instead they license the design to several...

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Posted in ARM, how-to | 14 Comments »

4-wire resistance measurement (Kelvin connection)

Friday, July 15th, 2016

[embed][/embed] In this video w2aew demonstrates the 4-wire resistance measurement (Kelvin connection).

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ESP8266 based plane spotter

Friday, July 8th, 2016

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...

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Posted in how-to | 1 Comment »

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