scan
pause
[0x80 0xf5] D:23 [0x81 r:2]
# Measure temperature
[0x80 0xf3] D:100 [0x81 r:2]
# Read serial number
[0x80 0xfa 0xf0] [0x81 r:8]
[0x80 0xfc 0xc9] [0x81 r:6]
# Read firmware version
[0x80 0x84 0xb8] [0x81 r]
si7021
i