Cedricici

After reboot, the same, "my" python code don't initialize correctly the device. I'll base my soft on your lib ;-) Thanks.

Thanks. I usualy wired my bme280 like you (vdd/GND/SDA/SCK) my version is the same as vlad59 with SPI, so SDO is to put to to GND or Vdd to choose the @, and I read in the datasheet p31 : I do this and after that i can detect the device on the bus, not before.

Many thanks for yours rapid answers ! I try your code and the 2 sensors run perfectly... with my python code too now !!!! This is the code i try : (not mine) https://github.com/SWITCHSCIENCE/BME280/blob/master/Python27/bme280_sample.py The difference with yours is that it don't write to register before reading. Is that a prerequisite? Again, this python code works now and it always works on my pi. Is there an initialization file or something that is write to the OS for i2c devices? Ia'm now ready to close my WeatherStation box ;-) Cédric

almost one year later, part of answer for those who find the topic. On the orange pi zero, I have to put the CSB pin to Vdd (3.3v) to get the sensors works, but it's not enough for me because the values are not corrects.

Hi, First, i'am french, excuse my bad english... I have a problem with my orangepi zero using a bme280 weather sensor with i2c. (I have 2 sensors) After long search and try, i've found the way to make this sensor working with the orange pi zero, by reading the datasheet where it's indicated that you must put CSB to Vdd to select i2c interface. !!! - I never wired this pin to my rapsberry pi and it always work , never see in any tuto too!!! Th problem is that I don't read good values, it seem that the values are always the same, based on calibration . I try to figure out what happen but i'm not so friendly with i2c protocol. Here are the results of my tests from my rapsberry, the 2 sensors works fine. pi@raspberrypi:~/i2cBME280 $./bme280-1.py temp : 22.00 ℃ pressure : 1033.26 hPa hum : 52.78 ％ pi@raspberrypi:~/i2cBME280 $ i2cdump -y 1 0x76 No size specified (using byte-data access) 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80: 94 50 89 42 7c 2e f0 06 36 70 c2 68 32 00 62 8f ?P?B|.??6p?h2.b? 90: 2f d6 d0 0b ec 19 47 00 f9 ff ac 26 0a d8 bd 10 /?????G.?.?&???? a0: 00 4b 08 00 00 00 00 00 00 00 00 00 33 00 00 c0 .K?.........3..? b0: 00 54 00 00 00 00 60 02 00 01 ff ff 1f 71 03 00 .T....`?.?..?q?. c0: 00 00 27 ff 00 00 00 00 01 00 00 00 00 00 00 00 ..'.....?....... d0: 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 `............... e0: 00 76 01 00 12 03 00 1e 4e 41 ff ff ff ff ff ff .v?.??.?NA...... f0: ff 00 01 00 27 a0 00 51 47 00 81 8b 00 6a d8 80 ..?.'?.QG.??.j?? pi@raspberrypi:~/i2cBME280 $ i2cdump -y 1 0x77 No size specified (using byte-data access) 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80: 91 70 89 3f 60 2e f0 06 2f 6f 7f 67 32 00 3a 8f ?p??`.??/o?g2.:? 90: 50 d6 d0 0b e6 1d 00 00 f9 ff ac 26 0a d8 bd 10 P?????..?.?&???? a0: 00 4b b2 00 00 00 00 00 00 00 00 00 33 00 00 c0 .K?.........3..? b0: 00 54 00 00 00 00 60 02 00 01 ff ff 1f 71 03 00 .T....`?.?..?q?. c0: 00 00 27 ff 00 00 00 00 01 00 00 00 00 00 00 00 ..'.....?....... d0: 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 `............... e0: 00 72 01 00 12 0c 00 1e 43 41 ff ff ff ff ff ff .r?.??.?CA...... f0: ff 00 01 00 27 a0 00 4d 76 00 80 dc 00 6e 25 80 ..?.'?.Mv.??.n%? And then from my orangepi zero : cedricici@orangepizero:~/bme280$ ./bme280.py temp : 20.68 ℃ pressure : 705.81 hPa hum : 80.81 ％ cedricici@orangepizero:~/bme280$ ./bme280-1.py temp : 21.76 ℃ pressure : 680.09 hPa hum : 76.92 ％ cedricici@orangepizero:~/bme280$ i2cdump -y 0 0x76 No size specified (using byte-data access) 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80: 94 50 89 42 7c 2e f0 06 36 70 c2 68 32 00 62 8f ?P?B|.??6p?h2.b? 90: 2f d6 d0 0b ec 19 47 00 f9 ff ac 26 0a d8 bd 10 /?????G.?.?&???? a0: 00 4b 08 00 00 00 00 00 00 00 00 00 33 00 00 c0 .K?.........3..? b0: 00 54 00 00 00 00 60 02 00 01 ff ff 1f 60 03 00 .T....`?.?..?`?. c0: 00 00 00 ff 00 00 00 00 00 00 00 00 00 00 00 00 ................ d0: 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 `............... e0: 00 76 01 00 12 03 00 1e 4e 41 ff ff ff ff ff ff .v?.??.?NA...... f0: ff 00 00 00 00 00 00 80 00 00 80 00 00 80 00 80 .......?..?..?.? cedricici@orangepizero:~/bme280$ i2cdump -y 0 0x77 No size specified (using byte-data access) 0 1 2 3 4 5 6 7 8 9 a b c d e f 0123456789abcdef 00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ 80: 91 70 89 3f 60 2e f0 06 2f 6f 7f 67 32 00 3a 8f ?p??`.??/o?g2.:? 90: 50 d6 d0 0b e6 1d 00 00 f9 ff ac 26 0a d8 bd 10 P?????..?.?&???? a0: 00 4b b2 00 00 00 00 00 00 00 00 00 33 00 00 c0 .K?.........3..? b0: 00 54 00 00 00 00 60 02 00 01 ff ff 1f 60 03 00 .T....`?.?..?`?. c0: 00 00 00 ff 00 00 00 00 00 00 00 00 00 00 00 00 ................ d0: 60 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 `............... e0: 00 72 01 00 12 0c 00 1e 43 41 ff ff ff ff ff ff .r?.??.?CA...... f0: ff 00 00 00 00 00 00 80 00 00 80 00 00 80 00 80 .......?..?..?.? It's clear that reading values are not set correctly ( 0xF7 to 0xFE) . The config registers (0xF2 0xF4 0xF5 are null too , but the bme280.py write this registers without any error? I use the same wiring on the two board (orange & raspberry) . Has someone see something like this before? Thank you.