Low- and high-frequency oscillators can be used in many experiments involving bionics. Using an oscillator, the evil genius can test how living beings react under certain stressful vibrations, stimulate plants to grow more quickly, or determine how flowers and fruit react to certain tests. Since the influence of many types of vibrations on living beings is not well known, this project provides a good opportunity to discover something new.
Under stress, the human body undergoes organic transformations that include electrical changes or electrical characteristics. External devices such as a lie detector can detect these changes. The basic idea of a lie detector is that, under stress, the skin's electric resistance changes, revealing if he or she is lying.
This article is part of the series How to Test Components, in 4 volumes, of my authorship. On the website, in the instrumentation section, the reader can find other articles teaching how to test components, including somewhat different procedures.
Perhaps the most prominent topic in our questions section and about which we are consulted in conversations with our followers is the use of electrolytic capacitors. For many, it may seem like a simple capacitor, but it doesn't have such a simple behavior due to its characteristics. In this article, we approach the behavior of these capacitors in a slightly more profound way, thus removing doubts that many may have.
The objective of this project is to develop a didactic braking distance simulator that can be used in demonstrations at science fairs and schoolwork, both by elementary school students and by high school students. The simulator was designed based on a strip of addressable RGB LEDs controlled by an Arduino system. As for the source code, the standard C programming language for Arduino and the Adafruit NeoPixel library were used, which makes it easy to control the LED strip. The interested student can assemble the electronic circuit and upload the source code even without having previous knowledge in electronics or programming.
The concern of all of us with cleaning is growing, both in view of the need to avoid pandemics such as the one that occurred at the time of writing this article (2020) and to keep clean environments frequented by people, for several other reasons. We have already dealt with other articles on ionizers and ozonizers, which are resources that make use of technology and that provide clean solutions for hygiene. The other device we will deal with in this article is the electrostatic filter.