Radio Projects

Enhancing An FM Transmitter’s Firmware using ATmega48

This hack is about rewriting the firmware of PLL FM transmitters based on AVR microcontrollers to add more functionalities. They’re commonly available on eBay from various sellers and for prices ranging from $40 to $80, depending mostly on the RF output power. If you don’t know if a similar transmitter is based on an AVR

Enhancing An FM Transmitter’s Firmware using ATmega48 Read More »

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

USB controlled DDS signal generator with ATmega88 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

AVR DDS signal generator V2.0 using ATmega16 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)

Signal Microcontroller Simulator using AT90S8515 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

Running TX433 and RX433 RF modules with AVR microcontrollers using Atmega8 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,

A Low Power PLL FM Transmitter using LMX1601 and ATtiny2313 microcontroller 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

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

Scroll to Top