SensorID based on individual BME280 properties

[Bolukan]

During production each BME280 is individually calibrated. The trimming values can be accessed via 42 register addresses, named calib_00...calib_41: 0x88-08D (temperature), 0x8F-0x9F (pressure), 0xA1, 0xE1-0xE7 (humidity).

The idea is to use a 4 bytes hash (CRC32) to create an unique sensorID. Furthermore the mac-address of the ESP8266 can still be send to the database as deviceID.

This idea will need extension of the BME280 library.

Sources:

• BME280 by Tyler Glenn - Platform IO 901-BME280
• CRC32 by Christopher Baker - PlatformIO 1202-CRC32
• Bosch BME280 datasheet

Registername	address	Register content
calib_00	0x88	dig_T1
calib_01	0x89	dig_T1
calib_02	0x8A	dig_T2
calib_03	0x8B	dig_T2
calib_04	0x8C	dig_T3
calib_05	0x8D	dig_T3
calib_06	0x8E	dig_P1
calib_07	0x8F	dig_P1
calib_08	0x90	dig_P2
calib_09	0x91	dig_P2
calib_10	0x92	dig_P3
calib_11	0x93	dig_P3
calib_12	0x94	dig_P4
calib_13	0x95	dig_P4
calib_14	0x96	dig_P5
calib_15	0x97	dig_P5
calib_16	0x98	dig_P6
calib_17	0x99	dig_P6
calib_18	0x9A	dig_P7
calib_19	0x9B	dig_P7
calib_20	0x9C	dig_P8
calib_21	0x9D	dig_P8
calib_22	0x9E	dig_P9
calib_23	0x9F	dig_P9
calib_24	0xA0
calib_25	0xA1	dig_H1
calib_26	0xE1	dig_H2
calib_27	0xE2	dig_H2
calib_28	0xE3	dig_H3
calib_29	0xE4	dig_H4
calib_30	0xE5	dig_H4/dig_H5
calib_31	0xE6	dig_H5
calib_32	0xE7	dig_H6
calib_33	0xE8
calib_34	0xE9
calib_35	0xEA
calib_36	0xEB
calib_37	0xEC
calib_38	0xED
calib_39	0xEE
calib_40	0xEF
calib_41	0xF0