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Archive for the ‘how-to’ Category

Rework and probe wires for circuit boards

Thursday, November 23rd, 2017

https://www.youtube.com/watch?v=5iNHC9djG2Q Tips & tricks to add probe wires for low-voltage, low-current signals on small fine pitch circuit boards. Via Electronupdate.

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Cheap DIY USB MIDI to CV

Thursday, November 23rd, 2017

A how-to on making a DIY USB MIDI to CV from DIY Synthesizer: This one is simple and does not require any expensive Teensy’s or STM32. It runs on the ATtiny85 using V-USB. The ATtiny is programmed with the Micronucleus bootloader and is firmware upgradeable incircuit. More details at DIY Synthesizer homepage.

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Overdrive guitar effects pedal

Friday, November 17th, 2017

Eddie over at Bantam Tools shared detailed instructions of how to build this DIY overdrive effects pedal: This project shows you how to make your very own effects stompbox! We'll go through the steps of downloading the .brd file, loading the file into our software, milling the board on the...

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How to configure I2C sensors with Arduino

Tuesday, November 7th, 2017

Edward Mallon writes: I’ve spent the last year in the ‘uncanny valley’ of the Arduino. That’s the point where you understand the tutorials at Arduino.cc, but still don’t get much from the material on gitHub because trained programmers would never stoop to using the wire.h library when they could just...

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Posted in Arduino, how-to | 1 Comment »

ZX81 internal 16K RAM (reversible version)

Tuesday, October 17th, 2017

Dave Curran wrote a post on his blog showing how he upgrades the ZX81 internal 16K RAM with a reversible version: One of the common issues with the ZX81 is the good old RAM pack wobble. Depending on the state of your edge connectors on your ZX81 and RAM pack,...

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Microcontroller action potential generator

Monday, August 21st, 2017

Scott Harden writes: Here I demonstrate how to use a single microcontroller pin to generate action-potential-like waveforms. The output is similar my fully analog action potential generator circuit, but the waveform here is created in an entirely different way. A microcontroller is at the core of this project and determines...

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Posted in AVR, how-to | 1 Comment »

TTL triggered stimulus generator

Thursday, August 3rd, 2017

Scott Harden has a nice build log on his TTL triggered stimulus generator project: I was presented with a need to rapidly develop a pulse generator to take a TTL input and output a programmable output (for now 0.1 ms pulses at 20 Hz for as long as the input...

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How to: STM32F103C8T6 as an USB device (Virtual serial port / CDC)

Wednesday, June 21st, 2017

https://www.youtube.com/watch?v=YZjnCOun1wU In this video Hugatry shared detailed instructions of how to use the STM32F103C8T6 as an USB device with virtual serial port: Cheap STM32F103C8T6 development board Blue STM32F103C8T6 development boards, also known as "BluePill", are cheap way to get started with 32bit ARM microcontrollers. The STM32 development board can sometimes...

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Posted in how-to, USB | No Comments »

Display Arduino analog input using LabVIEW

Tuesday, June 13th, 2017

Zx Lee shared detailed instructions of how to display the Arduino measurements using LabVIEW: To get started, I will explain what is actually going on in Arduino. In this project, I am using an Arduino Nano to acquire signals and send the data to PC. As mentioned earlier, two analog...

Posted in how-to | 1 Comment »

3D POV display

Friday, May 12th, 2017

Gelstronic shared detailed instructions of how to build this 3D POV display, project instructables here: In my project i use a spinning helix of LED strips. There are a total of 144 LEDs that can displays 17280 voxels with 16 colors. The voxels are arranged circularly in 12 levels. The...

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Posted in DIY, how-to | 2 Comments »

Build an open source laser reflection barrier

Tuesday, May 9th, 2017

Boris Landoni from Open Electronics writes about an open source project laser reflection barrier: It allows us to detect the presence and passage of an object thanks to the combination of a laser diode which emits a light ray and a phototransistor which detects reflected light. Robotics applications and industrial control systems...

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Posted in how-to, open source | No Comments »

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...

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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...

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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...

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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]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...

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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 »

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Recent Comments

  • Edward Mallon: Like a great Hollywood franchise, I've finally put together the prequel - months after the I2C registers tutorial was released: https://edwardmallon.wordpress.com/2017/12/17/adding-sensors-to-an-arduino-data-logger/ This adds to the...
  • Drone: So these go for around $330 USD and NO published calibration procedure online or otherwise? Given what's inside - I don't think I'll be considering...
  • Pekka Akselin: This is ridiculous!? :-) We are back at 256(!) byte EPROMs that needed multiple, a handful, of voltages to run! :-(
  • KH: Let's try a back-of-envelope calc balancing energies. From MCP1700 datasheet, there are graphs for a 200mA load step. Estimate the energy shortfall as 12uJ. Say...
  • Daniel: It's been a week and my comment is still awaiting moderation. Apparently the CIA doesn't want their involvement known?