sdorre/attiny-snippets

Attiny Code Snippets

Small Projects

Blink

A Simple LED Blinker example

PWM

A small firmware that use 3 PWM channels and fades an RGB led.

Millis

A small setup to implement the millis() function. Often used in Arduino scripts.

SSD1306

Firmware using a small SSD1306 OLED display. It is running using i2c protocol. The Minimal i2c Library is included it uses Bitbanging on PB3 (SDA) and PB4 (SCL).

HDC1080

This snippet show how to fetch temperature and humidity data from an I2C temperature sensor. The sensor is a Texas Instrument HDC1080

Sleep

Firmware Running a few second and then going to sleep. You can wake it up using a button on pin 5 (PB0). It will alternate between Deep Sleep and Idle state.

Power Measurements :

• Running at 1MHz: 1.23mA (+20ma if the led is plugged)
• Running at 8MHz: 4.35mA (+20ma if the led is plugged)
• Sleep Idle : 814uA
• Deep Sleep : 235uA

Notes

Useful includes

There are all the include files provided by avr-gcc. When I installed it on my computer it went to /usr/local/Cellar/avr-gcc/9.1.0/avr/include/avr

When compiling for an Attiny85, the include you want to see are :

• iotn85.h
• iotnx5.h

Porting programs that use the deprecated sbi/cbi macros

source

Access to the AVR single bit set and clear instructions are provided via the standard C bit manipulation
commands. The sbi and cbi macros are no longer directly supported.
sbi (sfr,bit) can be replaced by sfr |= _BV(bit) .

i.e.: sbi(PORTB, PB1); is now PORTB |= _BV(PB1);

This actually is more flexible than having sbi directly, as the optimizer will use a hardware sbi if
appropriate, or a read/or/write operation if not appropriate. You do not need to keep track of which
registers sbi/cbi will operate on.

Likewise, cbi (sfr,bit) is now sfr &= ~(_BV(bit));