Since ATtiny13 does not have hardware USART/UART in some cases we’re forced to use Software UART. In this example project a simple bit-banging UART has been presented. Compiled for both TX and RX it uses just 248 bytes of flash. Default serial configuration is 8/N/1 format at 19200 baud (lowest error rates during tests). It … Read more
Yet another blinky project that is based on internal timer. In our circuit a LED is connected to PB0 and it is made to blink for roughly every second by using timer OVF (overflow). The code is on Github, click here. Parts Required ATtiny13 – i.e. MBAVR-1 development board Resistor – 220Ω, see LED Resistor … Read more
This Project simply flashes the LED in random manner. It uses PRNG (Pseudo Random Number Generator) based on LFSR (Linear Feedback Shift Register) to generate 16-bit (pseudo) random numbers. The less significant bit of randomly generated number is a major factor in decision to on/off the LED. The code is on Github, click here Parts … Read more
This project shows how to simply Fade-In and Fade-Out a LED by using delay function to control pulse width what is sometimes called Software PWM (Pulse Width Modulation). In our circuit a LED is connected to PB0 and it is made to Fade the LED In and Out alternately. The code is on Github, click … Read more
The previous blinky project is very similar to what is presented here, with one exception. The delay function has been replaced by internal timer. In our circuit a LED is connected to PB0 and it is made to blink for roughly every second by using timer COMPA. The code is on Github, click here. List … Read more
This tiny project shows how to interface LED to the microcontroller ATtiny13 and write a simple program to make it blink. The code is on Github, click here. LEDs are widely used for various display functions and can be directly (not quite directly, through the resistor) driven from the pins of AVR chip. In our … Read more
This is a quick tutorial for beginners that aims to show how to install tools, compile the code with avr-gcc and send it to the MCU with avrdude. It also introduce basics of automation of this task by putting the all instructions into Makefile. The example files (main.c, main.bin, main.hex, Makefile) has been packaged as … Read more
This is a quick how-to guide of making a minimalist development boards for MCU of tinyAVR family like ATiny13/25/45/85. The idea behind this project was to create an environment for rapid development. I’ve been designing many projects based on this little MCUs and I didn’t want to wire it all up any more by hand. … Read more
The AVR architecture is a huge topic in itself. I will just provide a general picture of how the AVR microcontroller works. The AVR uses a Harvard architecture thus it has separate memories and buses for program and data. Instructions in the program memory are executed with a single level pipelining. While one instruction is … Read more
The AVR is a modified Harvard architecture 8-bit RISC single-chip microcontroller. The AVR was developed by Atmel in 1996 and was one of the first microcontroller families to use on-chip flash memory for program storage. The AVR microcontoller is like a small computer – includes a CPU, some flash program memory, some SRAM and some … Read more