Nowadays you can use your smartphone as an infrared remote controller handset to control compatible home appliances, a music system for example. Since most of the smartphones available today do not have an infrared sender, I recently developed a number of add-on hardware solutions to make your Android smartphone as a powerful infrared remote controller…. [Read More]
Simple Wireless Door Bell
Here’s an interesting circuit of a wireless door bell/buzzer for electronics students and hobbyists. The circuit is a short-range radio-frequency (RF) tone generator realized with the help of a cheap 433MHz RF transmitter & receiver module pair commonly available from almost all online electronics component shops. Apart from the RF modules, only a 555 timer… [Read More]
Tiny Tone Decoder Module
I‟d made a number of tone decoder projects with the unique NE567 PLL tone decoder chip in 1990s, and most were published in Elektor Electronics (UK), Silicon Chip (AU) and Electronics For You (IN) magazines. Recently I found a batch of the nostalgic NE567 chips in a webshop and bought a couple of them for… [Read More]
Portable Snake Repeller
Afraid of snakes? Don’t worry, here is a portable electronic snake repeller solution to keep all poisonous snakes out of your surroundings. All you need is to simply put the device on the bare floor/soil to scare away many kinds of snakes, quickly and safely. Design of the little device is based on the proven… [Read More]
Little Melody Maker
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 Humidity Sensor with 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 HYT221 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]
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