Solder all components, specially BPW34 array and 433MHz transmitter

avrdude -C ./avrdude.conf -v -p attiny85 -c usbasp -P usb -U lfuse:w:0x42:m -U hfuse:w:0xdf:m -U efuse:w:0xff:m

BOD OFF, 1MHz, fast startup 0ms

there is sample Manchester code firmware transmitter code

Use arduino UNO with 433MHz receiver to receive transmitted code, for debugging and transmission test, open power jumper and connect CR2032 battery to check transmission.