attiny85 sample apps and libraries

Introduction

ATtiny85 MCU - some tests and example apps + I2C and LCD libraries

Low power LED blink (lp_blink.c)

LED blink firmware putting the MCU into power-down state between the LED changes.

Charlie (charlie.c)

A simple demonstration of PWM LED charlieplexing.

I2C LCD display demonstration (main.c)

MQ6 readout and a progress bar on a LCD.

MQ6 gas sensor demonstration (mq_6.c)

MQ6 readout and a progress bar on a LCD.

Annoyatron

A simple circuit making different noises at random intervals when left in the dark. The sounds/noises are:

• snd/snd_cricket.c - cricket chirp
• snd/snd_droplet.c - leaking faucet
• snd/snd_insect.c - buzzing insect
• snd/snd_scifi.c - sci-fi/robot sounds
• snd/snd_water.c - running water
• snd/snd_whisper.c - scary whispers

Connections are simple:

• PB1/PB4 - piezo buzzer
• PB2 - LDR (light-dependent resistor) to VCC and a 47k resistor to GND

Simple Geiger Counter firmware (geiger.c)

Simple Geiger Counter based on ATtinyx5 MCU. This is more of a Geiger alarm. Tracks the radiation dose internally, but only signals two alarm levels on a two-color LED and produces sound clicks if the alarm level is breached. It's also designed to be very low-power (battery life test ongoing). No schematic yet, but here is a block diagram and a veroboard-style PCB (made with VeroRoute).

The BJT transistor can also be MPSA42. The buzzer MOSFET should preferably logic level.

The firmware is designed as a simple and lightweight cooperative scheduler maintaining in every state the lowest power level possible:

U8g2 SSD1306 i2c OLED display test

U8g2 SSD1306 i2c OLED + DS3231 clock app

Speech

Simple speech synthesis test app containing all the phrases needed to implement a talking clock (and more).

Candle

Simple, 2xLED candle simulation. Based on ATTINY13 code from here. Additionally supporting automatic turn on at night via LDR.

WS2812

Minimalistic WS2812(B) lamp with just one button.

Configuring

cmake -DCMAKE_BUILD_TYPE=Release -DAVR_MCU=attiny85 \
      -DAVR_PROGRAMMER=avrisp -DAVR_PROGRAMMER_PORT=/dev/ttyACM0 \
      -DMCU_FREQ=8000000 -DCMAKE_TOOLCHAIN_FILE=../toolchain-avr-gcc.make ..

make -j

Contact

If you have questions, contact Mariusz Ryndzionek at:

mryndzionek@gmail.com