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Articles from Bits on a Board

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Tinysensors Redux

From programmablehardware.blogspot.com 7 months ago in Blogs

 Raspberry Pi Zero-W with Tinysensor HatIt is often instructive to revisit an old project: you never know what you might see with fresh eyes. Such is the case with Tinysensors, which has featured here several times over the years. Since...

Soldering surface-mount components

From programmablehardware.blogspot.com 8 months ago in Blogs

 The image shows a breakout board for an NCP1402-based boost converter which steps-up 1.5v to 5v; these circuits are widely-used to power 5v (or nowadays 3.3v) from a single coin cell. (The board is my design, in KiCad, based on the...

Simple Variable Voltage Bench PSU

From programmablehardware.blogspot.com 9 months ago in Blogs

Back in the days of the desktop PC, a common DIY project was to re-use its ATX power supply as the basis of a Bench PSU. Sadly those days are slipping into the past as more and more of us...

KiCad Kata

From programmablehardware.blogspot.com 2 years ago in Blogs

Pretty (but dumb) LED MatrixThe picture shows the result of another workout with KiCad as executed by Seeed Studio and finished by me. This looks rather prettier than the original and was considerably easier to solder, not to mention more LEDs!However a few...

At the Margin

From programmablehardware.blogspot.com 2 years ago in Blogs

(Who knew that the Economics of Seinfeld was a thing? Given that it was the first link returned by Google, everyone but me I guess!)The idea of "marginal cost" is usually in mind when I'm preparing a PCB order from Seeed...

Soldering Kata

From programmablehardware.blogspot.com 2 years ago in Blogs

7x7 LED MatrixWhen I were a lad, LEDs were a big deal, literally: £1 each. Now someone in China manages to make a living selling them for £1 for 100. With inspiration provided by an Instructable, a rainy afternoon and...

It speaks!

From programmablehardware.blogspot.com 3 years ago in Blogs

Porting TTS to the ESP8266 processor has been on my to-do list for a while now, prompted by a comment on an issue I'd created to remind me. To do this, I realised that I'd have to reacquaint myself with...

ArduTouch

From programmablehardware.blogspot.com 3 years ago in Blogs

One of the very few downsides of ordering PCBs from Seeed Studio's Fusion service is the shipping cost. While an individual PCB can cost less than $0.50 in multiples of 10, shipping to Western Europe can add another $20.One way to...

Web-Configured ESP8266

From programmablehardware.blogspot.com 3 years ago in Blogs

A unique feature of Internet-enabled "things" is that they often have an Internet connection and little else. First-configuration of these devices therefore presents a challenge, which most solve by creating their own wireless access point, to allow their owner to...

WifiWeatherGuy

From programmablehardware.blogspot.com 3 years ago in Blogs

My title will no doubt remind regular readers of 2013's Weather Guy, a weather app which completely maxed out an ATMega328. Well it's had a technology refresh replacing Ethernet with Wifi, XML with JSON and AVR with ESP. A surprising amount of...

Autumn Update

From programmablehardware.blogspot.com 4 years ago in Blogs

Some recent updates on the Github:Interrupted is now compatible with the Arduino (1.8.4 and above) and Energia (18 and above) IDEs. However you have to cut-and-paste the examples, for now.Tasks is also compatible with the Arduino and Energia IDEs, and (maybe)...

ESP12-e Emergency Development Board

From programmablehardware.blogspot.com 4 years ago in Blogs

Mini-breadboards or DIY ESP Development Board?What do you do when you can't wait for cheap breadboards to arrive from China? Build a development board of course!The picture shows the work of an afternoon, to make a dev-board for the ESP-12 "IO Adapter...

Further adventures in ESP8266

From programmablehardware.blogspot.com 4 years ago in Blogs

ESP-12E with Adapter BoardThis neat piece of bargain-priced kit arrived in the post from China recently and today I got around to soldering it together. You-Tube-r RandomHacks has a nice video describing how he did it; I'll just summarize my experience...

Sonoff Wireless Switch

From programmablehardware.blogspot.com 5 years ago in Blogs

All for less than a fiver!This little baby is an ESP8266-powered wireless mains relay from ITead. Although it comes with firmware installed which will suit most people, that requires an internet connection as it needs to talk to the Amazon...

A Tinier Tiny

From programmablehardware.blogspot.com 5 years ago in Blogs

Now even tinier!The photo shows an upgrade to last year's tiny ATtiny development board: now even smaller and with fewer components but with better breadboard performance!The schematic and board layout (for Eagle) along with gerbers can be found here. The pcb...

Raspberry Pi Media Centre

From programmablehardware.blogspot.com 5 years ago in Blogs

I have a love-hate relationship with our Raspberry Pi based Kodi Media Centre. On one hand it's cheap as chips and streams all the TV shows we could want (while not being a television) but on the other it's prone to regular...

The Dining Philosophers

From programmablehardware.blogspot.com 6 years ago in Blogs

It seems as if this blog has been veering towards software for a while now, and this post is about as far from hardware as it's ever been --- but hey, it has LEDs!The problem of the Dining Philosophers was first...

mspdebug

From programmablehardware.blogspot.com 6 years ago in Blogs

When it comes to debugging programs, the first tool in my toolbox for compiled languages like C or C++ is usually 'print'. I don't tend to bust out a debugger unless I'm in an IDE such as IntelliJ.This can pose...

Simple Breadboard Power Supply

From programmablehardware.blogspot.com 6 years ago in Blogs

It's very satisfying to build something for which you've all the parts to hand, there's no waiting around, just immediate gratification. This little build is such a thing. It's a dual-voltage (5v and 3.3v) power supply which plugs into a...

Interrupted

From programmablehardware.blogspot.com 6 years ago in Blogs

Interrupted is a new approach to developing low-power, low-latency Arduino sketches, which was motivated by two observations:That the default mode of programming for Arduino is busy-waiting, andThe runtime support for power management provided by avr-libc is basic, being charitable to it.Taken...

A tiny ATtiny

From programmablehardware.blogspot.com 6 years ago in Blogs

Very tiny! Recently I was surprised to discover that although I've made several projects using one, I'd never built a development board around the ATtiny85. With any project there are always design choices and a couple of important ones here were:Is...

RF24 with ATtiny84

From programmablehardware.blogspot.com 6 years ago in Blogs

An ATtiny84 and nrf24l01+ transceiverThe nrf24l01+ is an amazing little wireless transceiver which is (a) incredibly cheap (how about 10 for €8?) (b) can be put into an extremely low-power mode under software when not transmitting and (c) is controlled...

TinySensor Server

From programmablehardware.blogspot.com 6 years ago in Blogs

Well after almost a year I decided it was time to update this project with improvements to both its hardware and software.On the hardware side, the server is still the original Raspberry Pi model B, but I've mounted the nRF24L01+...

Retrocomputer Resurrection

From programmablehardware.blogspot.com 6 years ago in Blogs

"What's a Computer?"This chimera is a microcontroller emulation of a UK101, an 8-bit microcomputer from the early 1980s. Needless to say I had one; it is a shocking thirty-three years since, as a spotty teenager, I soldered one together over the...

Space Invaders!

From programmablehardware.blogspot.com 6 years ago in Blogs

When I was a teenager Space Invaders arrived and changed the world. I must have put pounds into that machine in the local chipper, in the days when chips cost shillings. It never occurred to me that you could actually buy one...

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