Categories

Archive for the ‘how-to’ Category

DIY thermal vision shoots 360 panoramas

Wednesday, April 19th, 2017

Saulius Lukse has posted his DIY 360 panoramas: It might seem simple task but it involves some tricks to control motors and read sensor data from two separate controllers. One of the challenges I faced is meshing position and temperature data. Feedback received from each controllers is timestamped. After scan is...

Tags:
Posted in DIY, how-to | No Comments »

Dumb thermometer gets digital output

Monday, April 3rd, 2017

Saulius has finished a new project article, a dumb thermometer gets digital output: Some time ago I purchased 4 channel thermometer. Soon after tried few optical character recognition (OCR) techniques on 7 segment symbols including pytesseract, they worked but I was not happy with results. Few days ago pyimagesearch published...

Tags:
Posted in how-to | No Comments »

The 1 bit = 6 dB rule of thumb, revisited

Wednesday, March 29th, 2017

Steven writes: Almost ten years ago I wrote an entry about the “1 bit = 6 dB” rule of thumb. This rule states that for each bit you add to a signal, you add 6 dB of signal to noise ratio. The first derivation I gave then was focused on...

Tags: ,
Posted in how-to | No Comments »

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...

Tags: ,
Posted in Arduino, how-to | No Comments »

Ultrasonic Transducers – measurements and horn design

Thursday, February 23rd, 2017

[embed]http://www.youtube.com/watch?v=-E7zlQEk5MA[/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...

Tags: ,
Posted in how-to | No Comments »

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...

Tags: ,
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...

Tags: ,
Posted in how-to | No Comments »

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...

Tags: ,
Posted in how-to | No Comments »

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...

Tags: ,
Posted in how-to | 5 Comments »

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.  

Tags: , ,
Posted in how-to | No Comments »

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...

Tags: ,
Posted in how-to, Videos | No Comments »

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.

Tags:
Posted in how-to | No Comments »

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...

Tags: , ,
Posted in how-to | No Comments »

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...

Tags: ,
Posted in how-to | No Comments »

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...

Tags:
Posted in how-to | No Comments »

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...

Tags: ,
Posted in how-to | Comments Off on PRU tips: Understanding the BeagleBone’s built-in microcontrollers

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…)

Tags: ,
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…)

Tags: ,
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...

Tags: ,
Posted in how-to | No Comments »

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...

Tags:
Posted in how-to | No Comments »

Next Page »

Recent Comments

  • hli: Sunday++
  • Max: Jolly good stuff, although the "include 100 W resistors in series with the inputs and outputs" part is quite hilarious until one realizes* they meant...
  • Admir: Me
  • Mego: me
  • Geoff: Yes please!