TinyLoRa-BME280 v1.1
I made some improvements based on the feedback from @jym with regard to the hardware interrupt from DIO0 pin.
In v1.1 only PB3 and PB4 from the ATtiny are needed, no hassle with fuse bits changing the reset pin PB5.
I also had some problems with the current of the BME280 drawing 0.6mA in sleep mode.
Now I disable the SPI interface and set the SCK and DO pin as Input and Low before the ATtiny goes in power down mode.
This gives me the promised 0.1uA of the BME280 as written in the data sheet.
The sleep current of the RFM module is 0.5uA.
Most of the power consumes the ATtiny 3,5uA @ 2,8 volt in power down mode so there is still space for improvement.
Will be continued… it’s a race to the bottom. 
