Albert Einstein He developed the general theory of relativity, one of the two pillars of modern physics (alongside quantum mechanics).

The first integrated circuit invented by the engeneer Jack S. Kilby1 (1923-2005) contained only a few transistors. Texas Instruments.
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Electronoobs BLOG

Whistling detection Arduino
Electronoobs team - november 18, 2017
whistle detector with arduino
Let's build our HOMEMADE whistle detector circuit. The idea is more than simple. Using a microphone we detect sound. Next we amplify that signal two times in order to have a square pulse signal with the same frequency as the input signal from the microphone. Then we connect that square wave to one Arduino input and measure the frequency using interruptions. Next we check if the range is between (800 and 1800Hz in my case) and activate any other loop giving the Arduino something to do. Easy right?

We will use an electret microphone. Electret Condenser Microphone, as the name suggests is a parallel plate capacitor and works on the principle of a variable capacitance. It consists of two plates, one fixed (called the back plate) and the other moveable (called Diaphragm) with a small gap between them. An electric potential charges the plate. When sound strikes the diaphragm it starts moving, thereby changing the capacitance between the plates which in turn results in a variable electric current to flow.

Posted by ELECTRONOOBS, see Q&A page here.
Homemade electric scooter
Electronoobs team - november 07, 2017
arduino homemade electric scooter
Let's build our HOMEMADE electric scooter. This is a very easy electronic project. The most difficult part is the construction of the scooter and by that I mean the brushless motor connection with the wheel. You'll see an easy way to transfer the motor rotation to the wheel. Make sure you'll read all the extra info, all the schematics, and download the codes and STL 3D files from the links below in this tutorial. Also read all the comments in the code in order to understand how it works.

Posted by ELECTRONOOBS, see Q&A page here.
Arduino based drone V2.0
Electronoobs team - october 16, 2017
arduino DIY drone
This is the second version of the previous Arduino based DRONE. In that tutorial we've build the transmitter, receiver and flight controller. The problem is that the flight controller code was a platform named MultiWIi. Now I want to create my own code for the flight controller of the Arduino drone and make it compatible with any commercial radio transmitter/receiver that uses PWM signals. Also compatible with any size, ESCs or brushless motors.

Posted by ELECTRONOOBS, see Q&A page here.