Circuits & Schematics - Wireless - 5

Ali Asgher Mansoor Habiby and Abdus Sami Abdul Qayyum, Sir Syed University, Karachi, Pakistan EDN When you go hiking or mountain biking, or simply take a long walk around the neighborhood, you might wonder about the distance you covered or specific ...

You can make a wireless temps system with two ICs You can use a local temperature sensor and an ASK (amplitude-shift-keying) transmitter/receiver pair to design a simple wireless temperature-monitoring system with data-logging capabilities. A ...

Part 1 Description and Schematic Part 2 Firmware and Sowtware Assembly Because the circuit was so simple I took the easy way out and assembled it on a piece of veroboard. Nowadays I would design my own printed circuit board (see custom PCBs). ...

Part 1 - Description and Schematic PIC Firmware The firmware running on the PIC18F2550 was written for the CCS C compiler and uses the CCS USB protocol stack, which in turn appears to be derived from Microchip code. At the top level it is quite ...

Have you ever wondered exactly what is going on in the 2.4GHz WiFi and ISM band around your house. What channel is it best to set your wireless router to? Why are you getting such poor performance across your WiFi network? Is your neighbour on the ...

This shield could be used as a stand-alone transponder key, or with Google’s servers to create a cloud-computing application. It’s time to present you an application with RFID. We want to show you how to use the popular Arduino to ...

Varactor (or “varicap”) diodes are used primarily in radio-frequency (RF) circuits to provide a capacitance that can be varied by changing the applied voltage. These types of diodes often are used for tuning circuits, such as RF ...

The software was next. Using the Arduino IDE, I implemented a simple menu system that allowed me to enter the relevant facility and CardID data directly from the keypad. I also provided a way of displaying the data using the LEDs that I mounted on ...

So the next step was to identify how to pretend to be a card - I wanted a card that I could type a card number into, so it had to have a microprocessor on it, was well as a keypad to allow the data to be keyed in. The Atmel ATmega8 manipulates the ...

RFID projects have been pretty prominent recently, ranging from projects here in Instructables, to our local Silicon Chip magazine in Australia publishing a RFID door lock project in their November issue. Even I recently purchased a RFID door lock ...