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AM radio transmission using AVR

Posted on November 2, 2010 by R-B Leave a comment

When you think about building a radio transmitter circuit, the first thing that comes in mind is it requires too many analog components. But wait a minute, this guy demonstrates an AM transmission using a microcontroller. The interesting part is it uses a plant as an antenna for transmission. This project is based on Atmega324 microcontroller, internally clocked at 8 MHz, and it generates a modulated AM signal using internal timers and counters. It uses TC1 timer/counter to generate a PWM signal of approximately 540 KHz. This is the carrier frequency. You know that before AM transmission, the high frequency

USB business card with a computer chip

Posted on November 1, 2010 by R-B 2 comments

Have you ever seen a business card with a computer chip embedded on it? This one does. It has an ATtiny85 microcontroller chip that stores all your personal details. You plug it into an USB port of your computer, and find the details about the person opened into a text editor. The firmware uses V-USB (which is a software only implementation of USB) that allows the ATtiny85 microcontroller to act as an USB keyboard device, and type the stored info into the open text editor window.

Experimental board for ATTiny2313

Posted on October 28, 2010 by R-B Leave a comment

This is an experimental board for ATTiny2313 microcontroller that provides a 10-pin connector for in-circuit serial programming, and other header pins to access I/O pins. The AT2313 microcontroller runs on an external 10Mhz crystal. The board has a push button reset switch for resetting the microcontroller. The onboard regulator provides a +5V DC to the microcontroller. The board is also featured with a DB9 connector to communicate with a PC through RS232 port. The TTL to RS232 level translation is achieved through a MAX232 chip. The circuit for this board is very simple to build, and the PCB layout is

AVR displays body temperature on a Nokia 3310 LCD

Posted on October 13, 2010 by R-B 2 comments

This project describes how to measure temperature with Atmega8 and a thermistor and display it on a Nokia 3310 LCD. A thermistor is a device that changes its resistance with temperature. With a proper resistor divider network, the temperature can be measured by measuring the voltage across the thermistor. The voltage across the thermistor is measured by the on-chip ADC of Atmega8. The necessary coefficients to convert the resistance to temperature are given in the manufacturer’s datasheet of the thermistor. The thermistor used in this project is Vishay NTCLE100E3103JB0 (found at Sparkfun.com).

Open Source USB AVR Programmer for Students and Hobbyists

Posted on October 6, 2010 by R-B 3 comments

If you cannot afford to buy a USB programmer for AVR, don’t worry, you can make one by yourself. This programmer uses a Atmega8 microcontroller with a few external passive components. The good thing is you don’t need any USB controller because it is implemented in the firmware inside Atmega8. Yes, you are right, you need an AVR programmer once to load the firmware inside Atmega8. You figure out how you gonna manage that. This programmer has been tested under Windows, Mac OS X, and Linux and worked well. It can program a chip at speed up to 5Kbytes/sec. The

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