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View Code? Open in Web Editor NEWLog sensordata (BME280) directly to MySQL database
License: MIT License
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SensorID based on individual BME280 properties
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 |
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