Arduino 433 MHz Wireless Module

433 MHz Wireless Module
The 433 MHz wireless module. Transmitter: top-left. Receiver: bottom-right.

This post provides a quick reference for the 433 MHz wireless module, which is widely used in combination with the Arduino. The VirtualWire library is one possible way of utilizing the module. Continue reading Arduino 433 MHz Wireless Module

Typing Speed, Point Set Creator, and Poker Hands

This post summarises what I’ve been coding during the last week. That’s two new web tools for my Online-Tools webpage called Typing Speed and Point Set Creator, and in addition to that a mobile-first Poker Hands website. Continue reading Typing Speed, Point Set Creator, and Poker Hands

Poker Terms Selection

This is a selection of entries from the Wikipedia article Glossary of poker terms.

  • bet The opening bet of a betting round.
  • fold To discard one’s hand and forfeit interest in the current pot.
  • walk A walk is a situation where all players fold to the big blind.
  • laydown The choice to fold a strong hand in anticipation of superior opposition
  • raise To raise is to increase the size of an existing bet in the same betting round.
  • reraisecoming over the top Raise after one has been raised.
    backraise 
    A reraise from a player that previously called in the same betting round.
  • check-raise Deceptive play whereby a player initially checks with the intention of raising should another player bet.
  • check To bet nothing.
  • call To match a bet or raise.
  • overcall To call a bet after others have called.
  • hero call Calling when a player has a relatively weak hand but suspects their opponent may be bluffing.
  • cold call To call an amount that represents a sum of bets or raises by more than one player.
  • flat callsmooth call A call, in a situation where one might be expected to raise.
  • all in When a player bets all of their chips in the current hand.
  • coin flip A situation where two players have invested all their money in the pot and have a roughly even chance of winning.
  • heads up Playing against a single opponent.

Continue reading Poker Terms Selection

Microsoft HoloLens: First Impression

HoloLens TimoToday, 14. Dec 2016, I got the chance to try the new Microsoft HoloLens. This article explains briefly what that is and which impression I got.

The Microsoft HoloLens is a pair of augmented reality goggles. Opposed to virtual reality headsets you can still see your surroundings when wearing the HoloLens. What’s exciting about it? A transparent screen inside the headset adds 3D elements to you view. Pretty much as shown in Microsoft’s commercials.
Continue reading Microsoft HoloLens: First Impression

Smart Home Security Camera

This post explains the technical background of the security camera system, shown in the following movie. The post will answer the questions: How to detect a thief, how to take a photo, how to get notifications on your phone, and whether the system would work in reality.
Continue reading Smart Home Security Camera

Guess Solutions of Polynomials

For a given polynomial of $n$th degree

$$P_n(x)=\sum_{i=0}^n a_ix^i = a_nx^n+a_{n-1}x^{n-1}+…+a_1x+a_0$$

you can guess rational solutions $x$ for the corresponding problem $P_n(x)=0$ by applying the following two rules:

  1. $$x=\frac{p}{q}\text{, with } p \in \mathbb{Z} \land q \in \mathbb{N}\land p\mid a_0 \land q\mid a_n$$
  2. $$\lvert x\rvert\le2\cdot \max\left\lbrace \sqrt[k]{\frac{\lvert a_{n-k}\rvert}{\lvert a_n\rvert}}, k=1, …, n\right\rbrace$$

Continue reading Guess Solutions of Polynomials

Get into Orbit Without Lateral Acceleration

When I was about 6 years old, my dad explained to me that there was no possibility to shoot something right into orbit from the Earth’s surface. He said it was always necessary to accelerate sideways to reach orbit. At that time I did not really understand what he meant. However, later in physics class I did and I figured what he had told me was true. Now, 13 years later, I came up with a new thought: The Earth’s rotation adds lateral velocity to objects launched from its surface. This is also the reason why satellites, the ISS and pretty much every artificial object flying around Earth, orbits Earth counterclockwise and also, why most space flight organizations / companies launch their spacecrafts from locations as close to the equator as possible. Continue reading Get into Orbit Without Lateral Acceleration