The common reason why you would like to update this firmware is unlock slow-sck function for cheap (e-bay or Aliexpress) USBasp programmers, like this one on the picture. The slow-sck function allows to program AVR chips running at very low frequency clock source (i.e. 128kHz). When your USBasp programmer prints that warning it means that firmware update is … Read more
Yet another ATtiny13 blinky project. In our circuit a LED is connected to PB0 and it is made to blink for roughly every second by using Watchdog Timer. The code is on Github, click here. Parts Required ATtiny13 – i.e. MBAVR-1 development board Resistor – 220Ω, see LED Resistor Calculator LED Circuit Diagram Firmware This … Read more
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 See … 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 The delay function has been replaced by internal timer.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