This is a code for ATtiny25 to read temperature data from DS18B20 sensor
using the internal 8MHz clock source so you have to set the fuse bits.
Used sources:
- Software uart https://www.avrfreaks.net/forum/code-c-avr-gcc-software-transmit-only-uart
- DS18B20 & onewire explanation, code: https://www.pocketmagic.net/wp-content/uploads/2009/03/ds18b20_pre1.pdf