# raptorsnest.nl Posts

Featured Post

Bij wiskunde denken veel mensen aan formules, met (rare) letters en symbolen er in. Dat schrikt misschien af, maar eigenlijk heb je dat soort formules al op de basisschool gehad. Daar gebruikten ze alleen geen letters, maar puntjes of vlekken.

Op de basisschool kreeg je opgaves als:
$$5+\ldots = 8$$
Welk getal hoort er op de plek van de puntjes te staan?
Of:
$$5+$$$$=8$$
Welk getal zit er verstopt onder de vlek?

Een goede aanpak kan je helpen bij het oplossen van een wiskunde opgave, zelfs als die opgave moeilijk lijkt. In deze post laat zien hoe je een probleem gestructureerd kunt aanpakken, en ook waarom die aanpak buiten de wiskunde van pas kan komen.

Wiskunde is niet hetzelfde als rekenen, hoewel veel mensen dat misschien denken.

Als je binnenkort naar de middelbare school gaat dan ben je misschien nieuwsgierig wat naar wiskunde precies inhoudt. Ook als je wiskunde als vak al hebt (gehad) is het misschien niet helemaal duidelijk wat de kern van wiskunde is.

Bij wiskunde houden we ons bezig met regels en wat de gevolgen zijn als die regels gecombineerd worden. Dat klinkt heel breed, en dat is het ook, maar dat maakt het juist zo interessant 🙂

For this year’s secret santa I had to find a present for a friend of mine who plays the drums. So I decided to make him a drum and put the present in there. I wanted to try and make a drum that could actually be played.

How much electricity are we using? A colleague of mine has made a simple circuit attached to an Arduino to answer that question. Furthermore my parents were also interested in monitoring their electricity usage. So I decided to introduce my father into the world of Arduino for his birthday.

For the new bathroom in my home I also installed a Velux window, complete with an electric roller shutter. Of course I wanted to connect this shutter to the rest of my home automation system. Velux has options for this, but I wasn’t looking forward to integrating a vendor specific system to my existing setup. I already had Z-wave installed so I made a small project to connect the Velux shutter to a Düwi Z-wave module.

The reverse geo-caching puzzle box got me and a colleague talking about puzzle boxes, and making our own. As a first attempt I wanted to make a purely mechanical one. Such a puzzle box could not suffer from an empty battery. Also, I wanted to make it open with a magnet, to make it seem a bit more like a magic box 🙂

Everybody knows you should make a good backup, but how many people actually do it? An old colleague of mine wanted to reinstall Windows on his computer and thought his family photos to be safe on the system’s second hard drive. However, during the reinstall (which included formatting) there was a mix-up of the IDE and SATA drive and their partitions. When he rebooted his computer the photos were gone, replaced by a clean partition containing only the Windows OS.

My family has an annual reunion where a lot of games are played, many of them revolving around their favorite sport: soccer. Some twenty years ago my father came up with the question of whether we could measure the speed of a soccer ball. That way we would have a new game in which the family members could see who has the strongest kick. Since then this project has seen several incarnations.