We all use remote control handsets for controlling various household devices such as TV, AC, Music systems, curtains etc, and sometimes we seem to have problems with these devices, or even a newly purchased remote controller unit occasionally seem to malfunction, and identifying the issue becomes quite difficult for us. This simple 2 transistor circuit […]
Wireless Controllers
Make this IR Remote Control Range Extender
In this post we will learn how to increase or extend the range of an ordinary infra red or IR remote control through a 433MHz RF remote control system. IR Range Extender Concept The idea of this circuit is to feed the IR data from an IR transmitter into the transmitter input of an RF […]
Joystick Controlled 2.4 GHz RC Car Using Arduino
In this post we are going to construct a car robot which can be controlled using a joystick on 2.4 GHz wireless communication link. The proposed project is not only made as a RC car, but you can add your projects such as surveillance camera etc. on the car. By Girish Radhakrishnan Overview The project […]
GSM Car Ignition and Central Lock Using Arduino
In this post we are going to construct a GSM based car security system using Arduino, which can lock and unlock car’s ignition system and central lock by sending a password SMS to car from your cellphone By Girish Radhakrishnan Car theft can be a heart break; it feels like your loved one got kidnapped. […]
Cell Phone Charger with Timer
A simple cell phone charger with timer circuit is presented in the following article, which could be used for charging a given Mobile phone for a specified predetermined length of time. The idea was requested by Mr. Saad. Timer Controlled Smart Phone Charger Could you design me this charger circuit ? Input 230V 60 Hz, and […]
LiFi Internet Transmitter – USB Signal Transfer through LED
In this post we learn how to transmit Internet data through LiFi using a class D amplifier as the transmitter and an ordinary audio amplifier circuit as the receiver. How Li-Fi Concept Works If you are wondering how a LiFi concept could be used for transmitting USB data, this article will provide with all the […]
Learn to Make a Walkie Talkie using FM Radio
In this post we learn how to make a simple homemade walkie talkie circuit using ordinary FM transmitters and FM radios. Overview In one of my earlier post we comprehensively learned the making of a compact walkie talkie design, however I found that many new hobbyists and school students found the design difficult to adjust […]
GSM Pump Motor Controller using Arduino
In this post we are going to construct a farmer friendly GSM pump motor controller circuit which could turn on and off the irrigation system remotely from anywhere in the world via cellphone SMS and return you with an acknowledgement message. The idea was requested by Mr. PG Ragavandir. By: Girish Radhakrishnan Implementing GSM […]
Make this RFID using Arduino – Working and Interfacing Details
In this article we are going to take a tour on RFID circuit technology. We will be exploring how RFID tags and readers work, how to interface RFID module (RC522) with Arduino and extract some useful information from the RFID tags. By: Girish Radhakrishnan Using RFID Tags I am sure every one of you has […]
How to make a Remote Controlled Game Scoreboard
The post explains how to build a simple remote controlled game scoreboard circuit with two digits for facilitating the user a hassle free changing of the digits remotely, during a game or a match. The idea was requested by Mr. Richard. Digital Scoreboard for Volley Ball Game For our co-ed volleyball game we use manual […]
Bluetooth Car Ignition Lock – Keyless Car Protection
This circuit will allow the user to lock his car ignition using his phone Bluetooth, meaning the ignition can be locked/unlocked only through a specific code from the user’s cellphone Bluetooth. Overview In one of my earlier posts I have already explained how to hack a Bluetooth headset and use it for any desired switching […]
Bluetooth PWM Motor Controller
The post explains how to use Bluetooth technology for transmitting PWM wirelessly, the circuit application could be used for controlling various appliances such as motors, lights, RC gadgets etc using your Android phone. The Bluetooth PWM Transmitter In one of my earlier posts I explained how to hack and modify a Bluetooth headset for making […]
Foolproof IR Remote Control – Construction Guide with Code Details
In this post we are going to construct a customizable IR (infrared) based wireless remote control switch, which consists of IR remote and a receiver, you may modify according to your needs. In the later part of the article we learn about an upgraded foolproof version of an IR remote control which will respond only […]