Here is a simple do it yourself project of a little melody maker useful for all those hobbyists interested in making electronic toys or fancy gizmos for their kids. For extreme simplicity and flexibility, the circuit is built around the inexpensive microcontroller board ‘Digispark Attiny85 (Rev2)’. By default, the finished circuit will play the “twinkle… [Read More]
Poor man’s USB Rubber Ducky
I believe most readers are familiar with Hak5’s USB Rubbery Ducky. Well, simply it is a $45 key stroke injection tool, masked as a generic usb flash drive, widely used to hack unlocked computers. Computers recognize it as a regular keyboard and accept pre-programmed keystroke payloads at speeds beyond 1000 words per minute. In this… [Read More]
A Cute Night Lamp
Once again, here is the circuit diagram of a little night lamp wired around the evergreen 555 tiny timer chip. The circuit, designed to run on a standard 6F22 9V battery, can be used as a fancy night light in your kids’ sleeping room. A built-in photo sensor in the circuit turns its ‘sleeping lamp’… [Read More]
USB Power Bank Adapter
USB Power Bank – popularly known as mobile phone emergency charger – is an ideal solution for powering small microcontroller based hobby projects. Even the cheapest power bank in the market has so many useful features like auto power off and over current/short circuit protection which make them a safe and compact power supply for… [Read More]
Interfacing HYT 271 Humidity Sensor with 8051 using I2C
Measurement of external parameters like humidity and temperature is critical for meteorological applications, medical devices, agriculture and industrial drying systems. Presented here is a Humidity module HYT271 that provides low drift and good stability at high humidity range. This gives excellent humidity accuracy of 1.8%RH and reproducibility of 0.2%RH. In this tutorial, you will know… [Read More]
Poor man’s 433MHz RF Sniffer
Nowadays minuscule 433MHz RF modules are used in a wide variety of applications that require wireless control, and are very popular among the tinkerers because these modules are very cheap and can be interfaced easily with almost all microcontrollers. I have for some time wanted to hack my RF Remote Control Light Switch I bought… [Read More]
What is GPS and How does it work?
Introduction Have you ever thought of locating yourself on the blue planet (Earth)? This might be a tough question if you are residing in a new place. But don’t worry, the answer is simple, the GPS. GPS is a tiny device used as a navigation receiver in ships, and aviator, smartphones and many more. In… [Read More]
Ohms Law – Heat and Power
Every electronic and electrical appliance in this world runs with power. When this happens, some energy is dissipated in the form of Heat. Whereas the Power is the flow of voltage and current in a conductor or semiconductor. As you know conductor is a material that allows the flow of electrons when an electric field… [Read More]
Ohms Law Basics – Voltage, Current and Resistance
In the previous tutorial, we had discussed the applications of current, voltage, and importance of Coulomb’s law in electricity. But, without ohms law the operation of an electric circuit becomes incomplete. To fulfill this, Ohms Law is also involved. A German physicist Georg Simon Ohm discovered the ohms law and found the relationship between current,… [Read More]
Examples of Conductor and Insulator with Applications
There are many types of conductor and insulator used in electrical and electronic circuits. Substances covered with metal shields are the electrical conductors. In a conductor, electric current flows in the form of negatively charged electrons. Whereas insulator is a material suitable for preventing the flow of electricity. They bypass or store charge and the… [Read More]
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