Frequency Dividers are the circuits which divide the input frequency by n (any integer number), means if we provide some signal of frequency ‘f’ then the output will be the divided frequency ‘f/n’. Frequency dividers are very useful in analog as well as digital applications. Here we are building the circuit to divide the frequency by 2 or 4.
Simple Lie Detector Circuit
The concept behind this Lie Detector Circuit is that, we assume when a person lie he kind of pumps up his anxiety level which makes him sweat and develop moisture on his skin. We then use this piece of circuit to detect if there is moisture on his skin and based on the result we glow and LED, a green one for truth and red for lie. Of course yes this cannot be claimed as a lie detector, but you can use this to play with your friends and have fun. More than that you get to learn stuff.
To make your printer accessible from multiple devices or computers, either you need a Wi-Fi printer or need a costly setup to build a Network Printer. So in this season of festivities, what would be a perfect gift than a Network Printer (did I just give someone an Idea?) but instead of spending hundreds of dollars for this new acquisition, what if you could do the same by adding a $35 Raspberry Pi 3 to that old printer laying around on your desk? Yes I thought it’d be awesome too!
Fidget Spinner Electricity Generator
In this project, we are going to build a simple generator using an electromagnet and a fidget spinner to understand the concept of the electric generator.
A diode is a tiny electronic component used in almost all the electronic circuits to enable the flow of current in only one direction (unidirectional device). We can say that the usage of semiconductor materials to build the electronic components was started with diodes. Before the invention of diode there were with vacuum tubes, where the applications of both these devices are similar but the size occupied by the vacuum tube will be much greater than the diodes. The construction of vacuum tubes is a bit complex and they are difficult to maintain when compared with the semiconductor diodes.
DIY Brushless Motor Using Fidget Spinner
Just like the craze for Pokémon Go out of nowhere the fidget spinners got popular and it became more of trend to have one of these spinning between your fingers. But lately people (including me) eventually got bored of it and hence in this project let us bring in a new purpose for fidget spinner by building a simple motor using Fidget Spinner. With this circuit you will be able to make the fidget spinner rotate forever with the help of basic physics and not worry about having it idle at some corner of your room. You will also learn the basic of how a Brushless DC motor works since the concept we are using here is same as that used in the famous BLDC motors.
In this tutorial, we will attach a AC appliance with Relay and make a temperature controlled home automation system using Arduino. It also shows the temperature and appliance status on the 16*2 LCD display connected with the circuit.
In this project, we will learn how to build a simple robot using Arduino that could move towards the fire and pump out water around it to put down the fire. It is a very simple robot that would teach us the underlying concept of robotics; you would be able to build more sophisticated robots once you understand the following basics.
We have some instruments which could measure the sound signals in dB but these meters are slightly expensive and sadly we do not have an out of box sensor module to measure sound levels in decibels. And it is not economical to purchase expensive microphones for a small Arduino project which should measure the sound level in a small classroom or living room.