Categories
Electronics Fabrication Mechanical Programming

Nixie Tube Energy Meter

Featured on Hack a Day Having recently bought a house, project time has been a bit thin on the ground. As a standard terrace house, the consumer unit and electricity meter were in the entrance hallway, exposed and looking a bit naff. I liked the look of the meter so I quickly created a box […]

Categories
Programming

Simulink Raspberry Pi Driver Blocks

Following on from adding support to wiringPi for the MCP4725 DAC, I wanted to add driver blocks to Simulink such that one could use them to create graphical models for the Raspberry Pi that could interface with the real-world – a workable alternative to expensive real-time targets.

Categories
Electronics Programming

Setting Wooden Bits via BLE and ESP8266

My laser cut binary clock, Wooden Bits, originally had no means to set the clock, other than at compile time. I later added a tactile button and ISR to provide this function (increment the time until the correct time is shown) but I wanted a way to tap into the extra features of the DS3231 […]

Categories
Electronics Programming

Raspberry Pi DAC – MCP4725 with wiringPi

The Raspberry Pi lacks a DAC but using the I2C bus, one can easily add a device like the 12bit MCP4725. The GPIO library wiringPi provides support for I2C devices, however, getting the MCP4725 working with it isn’t a simple as one might hope. The device is 12bit but the I2C protocol works on bytes […]

Categories
Electronics Fabrication Mechanical Programming

Noise Crayon – Noise Amplitude to Light Spectrum Converter

Continuing on from my Ambient Noise Level Indicator, I wanted to create an enclosure and make it stand-alone – not requiring a computer to do the processing. I ended up with a little device that converts noise amplitude to the light spectrum: Noise Crayon. The Ambient Noise Level Indicator used the MCU serial host Processing […]

Categories
Programming

Developing Simulink Device Drivers for ARM Cortex

Simulink Embedded Coder offers an ARM Cortex-M support toolbox, which includes code optimisation for the MCU and QEMU emulation but lacks any S-Block drivers for the device. The lack of drivers limits the Simulink development to merely number crunching. You can create cevel blocks that execute external C functions but this requires separate source files […]

Categories
Programming

Building Atmel Studio ASF Project using External Makefile

The Atmel Studio IDE is a useful tool thanks to the comprehensive debugging support and management of project drivers via the Atmel Software Framework (ASF) – coming from a hardcore Vim advocate. One thing I dislike about IDEs is the fact they hide the make process from the user making it difficult to break a […]

Categories
Electronics Fabrication Mechanical Programming

Wooden Bits – Binary Clock

I’ve been meaning to make a binary wall clock for a while and to also try out kerf bending with the laser cutter. What put me off creating kerf bends before I found OpenSCAD, was the manual creation of all the lines in the right places. It’s the kind of repetitive, uniform task computers were […]

Categories
Fabrication Mechanical Programming

Laser Cut Adaptable Wire Dispenser in OpenSCAD

I wanted a wire dispenser that wasn’t fixed in place so I could move it to where I was working. To my surprise, such a thing doesn’t exist (I couldn’t seem to find fixed ones either, other than using a kitchen towel rail). Keen to put my new found love for OpenSCAD to use, I […]

Categories
Electronics Programming

Ambient Noise Level Indicator

As part of my work at MACH Acoustics – understanding how internal ambient noise levels affect different environments – I was inspired to create an indicator that shows when noise becomes higher than the base level. Some solutions already exist but they are pricey (because they used calibrated sound level meters), and not very engaging. […]