You Are Here: Home » Wireless Projects » Radio Projects (Page 3)

USB controlled DDS signal generator with ATmega88

A simple signal generator which produces sine waves (or any waveform really) at audio frequencies using DDS and is controlled a USB serial connection. Only 2 chips are used in this circuit. The AVRATmega88 which produces the signal, and an FT232R for the USB interface. While a computer is required to control the varying frequency of the oscillator, a fixed frequency project could be made without the USB int ...

Read more

AVR DDS signal generator V2.0 using ATmega16

Finally second and improved AVR DDS signal generator is here. First AVR DDS V1.0 generator was only an attempt of running DDS algorithm without any amplitude control. This time I still wanted to keep things simple like minimum count of widely accessible components circuit, single sided PCB that comes together with good functionality. AVR DDS specification AVR DDS signal generator V2.0 is a firmware based DD ...

Read more

Signal Microcontroller Simulator using AT90S8515

Introduction: The purpose of this project was to extend the Mixed Signal AVR simulator written in Fall 02 so that any single-issue microprocessor could be included in the simulation environment rather than limiting the simulations to systems based around ATMEL AT90S8515 series microcontrollers. In order to achieve this goal, a general architectural description language (ADL) simulator was written and the us ...

Read more

Running TX433 and RX433 RF modules with AVR microcontrollers using Atmega8

Sometimes in embedded design you may want to go wireless. Might be you will want to log various readings of remotely placed sensors, or simply build a remote control for robot or car alarm system. Radio communications between two AVR microcontrollers can be easy when specialized modules are used. Lets try to run very well known RF modules TX433 and RX433 that (or similar) can be found almost in every electr ...

Read more

A Low Power PLL FM Transmitter using LMX1601 and ATtiny2313 microcontroller

An LMX1601 Phase locked loop, a discreet  FET VCO, and an AVR micro controller combine to make a stable, easy to use monophonic FM transmitter that includes a an audio activated switch that turns the transmitter on only when its being used. Notice: Before operating a radio transmitter, find out what kind of transmitter operation, if any, is permitted in your locality. Radio transmitter operation is a seriou ...

Read more

A Simple FM Stereo Transmitter using ATTINY12 microcontroller

The parts to the right of the green capacitor are the FM radio transmitter. The parts between the 8 pin DIP and the transmitter are the resistor matrix. One capacitor, C5, is mounted on the back of the board, and one other capacitor, C11, had not yet been installed. It was later installed just below the 560k resistor. The connector in the upper-left is the unregulated power input. The connector in the lower ...

Read more

Multifunction 330 MHz Remote Control With an ATTINY2313 Simulating the PT2264 Encoder

This 330 MHz remote control sends timed sequences of control pulses to accomplish complicated tasks. You can probably tell that I used a lot of solder flux on this board. Lots of flux not only helps the solder wet to the copper, but it also greatly reduces solder bridges. You can probably tell that I used a lot of solder flux on this board. Lots of flux not only helps the solder wet to the copper, but it al ...

Read more
Scroll to top