Flashlight with software

So, you know when you are tired or bored and you go to strange places online? I somehow found this flashlight online and from the picture, you can see many high power LEDs + many high power batteries + adequate cooling => awesome light output. The price at that time was ~50$ so I ordered because it seemed I get a lot for my money.

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Author's profile picture Bogdan Rădulescu on DIY

Power meter for the entire apartment

In the weekend I wanted to do something fun for improving the visibility of energy consumption. I ended up with a nice LED display that shows usage in realtime and some cool charts on my phone.

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Author's profile picture Bogdan Rădulescu on DIY

Hacking the washing machine

I got the perfect washing machine in my early 20s when I was single. It has some predefined programs, no display or any other complicated features. I was using mostly “power + quick wash”. Now, in my early 30s, my wife uses programs that take hours and staring them after work means the cycle would be done after midnight. So, let’s make that hunk of metal controllable from the Internet.

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Author's profile picture Bogdan Rădulescu on DIY

Automating SurveyMonkey Responses

I wanted to give Selenium a try for a while and I just found the perfect pretext: earn enough votes in a SurveyMonkey poll to win a bottle of cognac.

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Author's profile picture Bogdan Rădulescu on Automation

Benchmarking Cloud VMs

Once in a while I compare the performance vs cost benefits of cloud vendors. In this case I just need to compare virtual machines, which is by far the most used service out there, so I guess sharing these results should be useful to many people.

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Author's profile picture Bogdan Rădulescu on Cloud

Testing charge-pump ICs

Sometimes we need a negative voltage rail. There are several ways to obtain that but most likely the easiest is to use a charge-pump IC with only two capacitors. Because the datasheet doesn’t always paint a clear picture I decided to order a few and do my own testing for the things I care about (current, ripple, switching frequency).

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Author's profile picture Bogdan Rădulescu on DIY

IoT Fuzzy Clock

Let’s see how to make a very precise clock that will be read with a large margin of error. It should be easy for the technically inclined and it can also be fun.

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Author's profile picture Bogdan Rădulescu on DIY

Hacking Radio Remotes

Cheap wireless remotes are everywhere and the purpose of this article is to learn how most of them work, how secure they are and how to create your own in order to clone or extend an existing remote.

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Author's profile picture Bogdan Rădulescu on electronics

MicroSD card quick test

MicroSD cards are everywhere these days but since these days it’s possible to film in UHD or in high speed with action cameras and phones it’s actually very important how quick these cards are at writing this data.

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Author's profile picture Bogdan Rădulescu on gadgets

PHP on Google App Engine

You can host your PHP apps on the Google infrastructure and only pay according to how popular your app is. Let’s see how it actually works.

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Author's profile picture Bogdan Rădulescu on Cloud