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Nathan Chantrell.net: The Magic of the Boost Converter
Or how to get 5V From a single AA Battery.It might seem like magic but a boost converter or step-up converter is a handy little device that can output a voltage greater than its input voltage. This...
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Nathan Chantrell.net: Raspberry Pi Finally Arrives
After a long wait the Raspberry Pi I ordered from Farnell on 29th February finally arrived yesterday.I expect that most people reading this blog knows all about the Raspberry Pi and the charity behind...
View ArticleAmin: betapitch: what it meant to us
We applied, we were shortlisted, we pitched and we didn’t win… But boy it was great! I personally never presented anything in front of such a crowd in my life. It ...
View ArticleAmin: Workshop: Solder and hack the Nanode
The first nanode workshop was a great success, we got to introduce many people to soldering and arduino. But we didn’t get to really hacking the nanodes and we couldn’t ...
View ArticleAmin: New logo and website revamp
Hello everyone, we are back ! With lots of fresh and refreshing news. First of all, I am very glad and proud to announce that we could charm a seed ...
View ArticleAmin: We’re pitching at betapitch this thursday
Betahaus is one of my favorite places in Berlin. I work and have meetings in the cafe, I hack around in the makerspace Open Design City at the back, and ...
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mharizanov: Home voltage analysis
I log the AC mains voltage at my house starting July 2013, you may recall my post where I was concerned about the unusually high voltage readings at home. Now that I have few months of data collected,...
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mharizanov: I am a @quantifiedself
I accidentally landed on a site called ‘quantified self’ last month and immediately realized I am doing lots of lifelogging myself. I track my commutes, log my weight, my body temperature when sick, my...
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mharizanov: Keypad as USB keyboard
I fiddled with a new keypad today, this is not the first time I have a keypad project, but this time I want it to act as a USB keyboard instead. This is a convenient way to enter numeric data and I...
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mharizanov: Tweeting my house’s power usage as sparkblocks
Sparkblocks are a text-only version of the sparkline charts, using just unicode symbols. These are a convenient way to represent trends in pure text, quite useful when you want to use SMS, tweets or...
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mharizanov: Control LG smart TV over the Internet using a Raspberry Pi
Here is a quick home automation project: controlling a LG smart TV over the Internet using a Raspberry Pi computer. There is a Python script already developed for that, so getting all this working was...
View Articlemharizanov: In-memory SQL analysis of emonCMS feed
It often happens that I need to know the the min/max/average values of an emonCMS feed or do basic data analysis/querying, I was running a SQL query on the database end to get my answers. In some...
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mharizanov: My dog as smart wireless DVR sensor
I live in a small village ~25km from Sofia, Bulgaria and commute daily to the city. My house’s alarm system would occasionally ring me and I would rush back home to see if all is fine, that can be...
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mharizanov: Funky v3 and YAPM project files now on github
I have published the Eagle design files for the Funky v3 and YAPM projects here and here respectively for anyone interested to try them out. A quick re-cap – Funky v3 is a miniature low power battery...
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mharizanov: Voice controlling things with a smartphone and Raspberry Pi
I am not a big fan of voice control, but this particular project turned out quite practical. What I wanted to achieve is to pick up my phone, speak out a command and so control connected things like my...
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mharizanov: Detecting AC
I sometimes have home automation projects that require detecting AC voltage (on/off only), previously have experimented with non-contact AC detection. Here is another approach that may be more suitable...
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John Cantor : Potential perils of plastic pipe
A college tutor recently suggested to me that the current environment in the heating industry does not encourage thinking. Maybe I should therefore be less amazed when I come across plumbers who...
View ArticleBluemotica: Bouwhandleiding NanodeRF
In het eerste artikel heb ik gemeld dat ik zelf mijn energiemonitor ga opbouwen met als basisstation een arduino Uno kloon, de nanodeRF en een shield-adapter daarop waarmee ik de sensoren kan...
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mharizanov: NodeRED RFM2Pi to emonCMS gateway
I created a Node-RED RFM2Pi gateway few weeks ago, have it running nicely since then. I decided to use that approach instead of a python script, since it is very flexible, visual and easy to extend....
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mharizanov: Presence detection using phone’s WiFi and Node-RED
Nathan tweeted a cool idea couple months ago, use static IP lease for your phone, ping it every minute to see if it responds, and if the ping times out that most probably means that the phone and his...
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