Archive for the ‘code’ Category
Upgrading Docker
Dockercon #2 is underway, version 1.7.0 of Docker was released at the end of last week, and lots of other new toys are being launched. Time for some upgrades. I got used to Docker always restarting containers when the daemon restarted, which included upgrades, but that behaviour went away around version 1.3.0 with the introduction […]
Filed under: code, Docker, howto | 1 Comment
Tags: Docker, script, upgrade
Multi tier apps in Docker.io
Docker provides the means to link containers, which comes in two parts: Outside the container (on the docker command line) a ‘-link name:ref’ is used to create a link to a named container. Inside the container environment variables REF_… are populated with IP addresses and ports. Having linked containers together it’s then necessary to have a little […]
Filed under: code, Docker, howto | 3 Comments
Tags: address, app server, database, Docker, Docker.io, Dockerfile, enviornment, link, linking, MySQL, Nginx, port, Ruby, Sinatra, SSL, ToDoMVC, web server
Node-RED on Docker
Docker is going into the next release of CohesiveFT’s VNS3 cloud networking appliance as a substrate for application network services such as proxy, reverse proxy, load balancing, content caching and intrusion detection. I’ve been spending some time getting familiar with how Docker does things. Since I’ve also been spending some time on Node-RED recently I […]
Filed under: code, CohesiveFT, Docker | 2 Comments
Tags: Docker, Docker.io, Dockerfile, image, index, node, Node-RED, node.js, repository
The compiler will not save you
…at least not in an embedded environment. There’s a commonly held myth in modern software development that compilers are smarter than people at optimising code for its eventual runtime environment. By extension there’s no point in writing efficient code, because your idea of efficient code might not actually be all that efficient, and any time […]
Filed under: code, software | 2 Comments
Tags: binary, c, compiler, microcontroller, msp430, optimisation, size
I’ve been very happy with the results from my Raspberry Pi controlled water bath for sous vide cooking, but I knew that the control loop could be improved. Past runs show fairly continued oscillation: I’ve been keeping track of the average power for my control loop, which has been coming out at 22%. So i […]
Filed under: code, cooking, Raspberry Pi | 10 Comments
Tags: 434MHz, bias, control system, DS18B20, mains, PI, PID, python, Raspberry Pi, remote control, RPi, Sous vide, water bath
Temperature control for a sous vide water bath is a popular application for hobbyist microcontroller kits, with lots of well documented projects out there. My favourite is the Sous Vader – if only for the attention to detail in the decal on the box. I’ve been planning my own for a little while, and got […]
Filed under: code, making, Raspberry Pi | 24 Comments
Tags: 434MHz, control system, DS18B20, mains, PI, PID, python, Raspberry Pi, remote control, RPi, Sous vide, water bath
Return of the Nanode thermometer
It’s almost a year since I built my Nanode thermometer, and it looks like another really cold snap is headed towards the UK – perhaps snow over the weekend. I’ve not had it set up for a little while, as the TMP36 sensor was reclaimed for a project that put Scratch and an Arduino together […]
Filed under: Arduino, code | Leave a Comment
Tags: arduino, bash, csv, date, lynx, Nanode, network, printf, script, sed, sensor, temperature, thermometer
In part 1 of this series I looked at ladder board, and in the next part I plan to review the Gertboard. This post is about Quick2Wire‘s boards, where I’ve been fortunate enough to try out some alpha and beta samples. Quick2Wire concept There’s an interface board that connects to the general purpose input output […]
Filed under: code, howto, Raspberry Pi, review | 2 Comments
Tags: ADC, API, DAC, dev board, github, GPIO, I2C, PCF8591, python, Quick2Wire, Raspberry Pi, Raspi, RPi, soldering, Wiring Pi
Raspberry Pi GPIO Joystick
After getting MAME going on my Raspberry Pi so that I could play old arcade games. I wanted to hook up a proper joystick. Back in the 80’s I had the excellent and ubiquitous Competition Pro 5000. As mine (foolishly) got sold with my Amiga stuff I got one on eBay, and it came in […]
Filed under: code, howto, Raspberry Pi | 37 Comments
Tags: advj, advmame, breadboard, cobbler, GPIO, joystick, MAME, python, Raspberry Pi, Raspi, RPi, uinput
Raspberry Pi Alarm
I set $son0 a summer holiday challenge of building an alarm system that would send an email (and it seems that I’m not alone). I was pleased to see that the latest edition (#4) of Magpi has an alarm project so we set about building it together. The hardware came together pretty nicely, but the software […]
Filed under: code, howto, Raspberry Pi | 3 Comments
Tags: alarm, GPIO, howto, python, Raspberry Pi, Raspi, RPi
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