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Archive for the ‘how-to’ Category

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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How does vacuum cleaner clean/dirty indicator work?

Wednesday, November 2nd, 2016

[embed]http://www.youtube.com/watch?v=u3KU8cqHx8g[/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]http://www.youtube.com/watch?v=Q_jzEyrcLbg[/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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Linear MOSFET and its use in electronic load

Monday, October 24th, 2016

[embed]http://www.youtube.com/watch?v=WUPrj03UbTM[/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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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]http://www.youtube.com/watch?v=kqkluABmJhQ[/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 »

ESP8266 NodeMCU Backdoor uPWM hack for IR signals

Wednesday, July 6th, 2016

The AnalysIR crew has published an article showing how to achieve accurate PWM for Infrared carrier signals on the ESP8266 NodeMCU: Quite simple really – just set the baud rate to 10 times the desired Infrared carrier frequency and send a ‘magic’ 8 bit character to achieve the desired duty...

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Posted in how-to, infrared | 2 Comments »

Fun with Analog multipliers: Squares, cubes, and VCAs

Tuesday, July 5th, 2016

[embed]http://www.youtube.com/watch?v=m6MqNZ7H99w[/embed] Craig writes, "Need a frequency doubler? Want to plot a cubic function on your ‘scope? How about a square root extractor, or a voltage controlled amplifier? Analog multipliers make all this (and more) a snap!" Details at Analog Zoo homepage.

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ATtiny based bidirectional motor control using L293D

Friday, July 1st, 2016

Rahul over at Xanthium has posted a tutorial on interfacing ATtiny with L293D: In this tutorial we will learn to interface L293D with ATMEL ATtiny microcontroller and control them bidirectionally.The microcontroller used here is ATtiny2313A which is interfaced to two L293D motor control chips for controlling upto 4 DC brushed...

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“Hello world” in the BCPL language on the Xerox Alto simulator

Tuesday, June 28th, 2016

Ken Shirriff writes: The first programming language for the Xerox Alto was BCPL, the language that led to C. This article shows how to write a BCPL "Hello World" program using Bravo, the first WYSIWYG text editor, and run it on the Alto simulator. The Xerox Alto is the legendary...

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