AVR development board for ATtiny13, ATtiny85, etc.

This is an upgraded version of MBAVR-1 – a minimalist development board for tiny AVR microcontrollers like ATtiny13, ATtiny15, ATtiny25, ATtiny45 or ATtiny85. The board has been designed for a rapid prototyping of devices based on tinyAVR chips. The small-size MBAVR-1t board can be installed directly on protoboard or used as shield by other PCB. Also, by adding DIP8 holder you can … Read more

ATtiny13 – reading temperature and humidity from DHT11

This article shows how to make ATtiny13 to read temperature and humidity from DHT11 sensor and log this information using a Software UART. What you need is connect DHT11 DATA-pin to PB0 and RX-pin of USB to serial adapter to PB3 of ATtiny13. You also need to connect sensor to power supply (3.3V or 5V). Well, with a little code … Read more

How to make ATtiny13 running at 128 kHz clock source

The ATtiny13’s default clock source setting is the Internal RC Oscillator running at 9.6MHz with clock divider /8 (fuses L=0x6A and H=0xFF; see fuse calculator). This short article explains how to downclock the ATtiny13 by swtiching to Internal RC Oscillator running at 128kHz without clock divider (fuses L=0x7B and H=0xFF) and still have a control to program AVR … Read more

How to update AVR USBasp firmware to latest version

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

ATtiny13 – disco lights using FFT

This is my another “disco lights” project which is an upgraded version of ATtiny13 – dance lights with FFT. This time I used a full implementation of FFT algorithm with reduced memory access to compute a power spectrum of audio signal. This version has also 3-channel lights but visual effects are much-much better! Required Parts ATtiny13  – i.e. MBAVR-1 (Minimalist Development Board) … Read more

ATtiny13 – PI metal detector

This experimental project shows how to build a simple PI (Pulse Induction) metal detector based on ATtiny13 / AVR microcontroller. My goals were to make a circuit as simple as possible and to use only popular / cheap electronic parts. The device has been tested with very small coil (55mm diameter, about 30 turns of 0.5 … Read more

ATtiny13 – 8bit mono class D amplifier

I always wonder whether it is possible to make an amplifier of class D on ATtiny13 or not. Some time ago I found George Gardner’s project based on ATtiny85 – TinyD. It was a sign to start challenging it with ATtiny13. It took me a few hours but finally I made it! The code is very short and useses a … Read more

ATtiny13 – clap clap switch

This project shows how turn ATtiny13 with sound detector module into smart Clap Clap Switch. The project has been designed to react on only double claps (clap clap – ON, clap clap – OFF). So, how it works? There is one pin for a MIC (digital output from sound detector module) and one pin for a … Read more

ATtiny13 – controlling stepper motor 28BYJ-48

This simple project shows how to control popular and cheap stepper motor 28BYJ-48 using ATtiny13. The code is on Github, click here. Parts Required ATtiny13  – i.e. MBAVR-1 development board stepper motor 28BYJ-48 with driver on ULN2003 Circuit Diagram Software This code is written in C and can be compiled using the avr-gcc. All information about how to compile this project is here. /** * … Read more

ATtiny13 – randomly flashing LED with PRNG based on BBS

This project is very similar to ATtiny13 – randomly flashing LED with PRNG based on LFSR. However, this time I used BBS (Blum-Blum-Shumb) algorithm as PRNG (Pseudo Random Number Generator) 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 Required … Read more