I need to use this uart implementation because the attiny25 does not have. The UART function works well if I send characters but with the temperatures from the sensor it fails. I use the default 1MHz clock speed and 2400 baudrate.
I think the schematic is good, there is the 4,7kOhm pullup, and the data wire is connected. Vdd is 5V.
Could somebody help me please where to find the problem? All of "my" code is here
_delay_ms(1000) function is actually 0,9813s. Is it possible, that the _delay_us() function is not very accurate so i got wrong timings?