# Pimoroni BME680: OSError: \[Errno 121\] Remote I/O error **URL:** \ **Category:** Support\ **Created:** [August 17, 2018, 3:14pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404 "2018-08-17T15:14:22Z")\ **Posts on this page:** 18\ **Page:** 1
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [August 17, 2018, 3:14pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/1 "2018-08-17T15:14:22Z")
Hi I have some problem with Pimoroni BME680. I verified chatting on Discord my soldering and plugging in position are ok. i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: – -- – -- – -- – -- – -- – -- – 10: – -- – -- – -- – -- – -- – -- – -- – -- 20: – -- – -- – -- – -- – -- – -- – -- – -- 30: – -- – -- – -- – -- – -- – -- – -- – -- 40: – -- – -- – -- – -- – -- – -- – -- – -- 50: – -- – -- – -- – -- – -- – -- – -- – -- 60: – -- – -- – -- – -- – -- – -- – -- – -- 70: – -- – -- – -- 76 – python read-all.py Traceback (most recent call last): File “read-all.py”, line 6, in sensor = bme680.BME680() File “build/bdist.linux-armv6l/egg/bme680/ **init**.py”, line 37, in **init** File “build/bdist.linux-armv6l/egg/bme680/ **init**.py”, line 141, in set\_filter File “build/bdist.linux-armv6l/egg/bme680/ **init**.py”, line 281, in \_set\_bits File “build/bdist.linux-armv6l/egg/bme680/ **init**.py”, line 296, in \_get\_regs IOError: [Errno 121] Remote I/O error pi@relayPi:~/bme680/examples $ python3 read-all.py Traceback (most recent call last): File “read-all.py”, line 6, in sensor = bme680.BME680() File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 40, in **init** self.get\_sensor\_data() File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 241, in get\_sensor\_data self.set\_power\_mode(FORCED\_MODE) File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 225, in set\_power\_mode self.\_set\_bits(CONF\_T\_P\_MODE\_ADDR, MODE\_MSK, MODE\_POS, value) File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 281, in \_set\_bits temp = self.\_get\_regs(register, 1) File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 296, in \_get\_regs return self.\_i2c.read\_byte\_data(self.i2c\_addr, register) OSError: [Errno 121] Remote I/O error Only once I got this output, then always I/O error python3 read-all.py Calibration data: par\_gh1: -13 par\_gh2: -19929 par\_gh3: 18 par\_h1: 638 par\_h2: 1036 par\_h3: 0 par\_h4: 45 par\_h5: 20 par\_h6: 120 par\_h7: -100 par\_p1: 36271 par\_p10: 30 par\_p2: -10474 par\_p3: 88 par\_p4: 3899 par\_p5: -79 par\_p6: 30 par\_p7: 31 par\_p8: -1321 par\_p9: -3139 par\_t1: 26327 par\_t2: 26442 par\_t3: 3 range\_sw\_err: 1 res\_heat\_range: 1 res\_heat\_val: 45 Initial reading: gas\_index: None gas\_resistance: None heat\_stable: False humidity: None meas\_index: None pressure: None status: None temperature: None Traceback (most recent call last): File “read-all.py”, line 37, in sensor.set\_gas\_heater\_temperature(320) File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 196, in set\_gas\_heater\_temperature temp = int(self.\_calc\_heater\_resistance(self.gas\_settings.heatr\_temp)) File “/usr/local/lib/python3.4/dist-packages/bme680/ **init**.py”, line 376, in \_calc\_heater\_resistance var1 = ((self.ambient\_temperature \* self.calibration\_data.par\_gh3) / 1000) \* 256 TypeError: unsupported operand type(s) for \*: ‘NoneType’ and ‘int’ Could you please help? ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [August 17, 2018, 4:07pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/2 "2018-08-17T16:07:47Z")
Do you have an alternate i2c baudrate set in `/boot/config.txt` something like `dtparam=i2c_baudrate=XXX`? ---
**Author:** ![s0litaire](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/s0litaire/32/4711_2.png) [@s0litaire](https://forums.pimoroni.com/u/s0litaire)\ **Post date:** [October 27, 2018, 4:37pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/3 "2018-10-27T16:37:27Z")
getting the same kind of error on my rPi3+ Calibration data: par\_gh1: -21 par\_gh2: -14972 par\_gh3: 18 par\_h1: 652 par\_h2: 1033 par\_h3: 0 par\_h4: 45 par\_h5: 20 par\_h6: 120 par\_h7: -100 par\_p1: 36444 par\_p10: 30 par\_p2: -10442 par\_p3: 88 par\_p4: 4718 par\_p5: -119 par\_p6: 30 par\_p7: 41 par\_p8: -2544 par\_p9: -2638 par\_t1: 26167 par\_t2: 26652 par\_t3: 3 range\_sw\_err: 0 res\_heat\_range: 1 res\_heat\_val: 40 Initial reading: gas\_index: None gas\_resistance: None heat\_stable: False humidity: None meas\_index: None pressure: None status: None temperature: None Traceback (most recent call last): File “/home/pi/scripts/read-all.py”, line 37, in sensor.set\_gas\_heater\_temperature(320) File “/usr/local/lib/python2.7/dist-packages/bme680/ **init**.py”, line 196, in set\_gas\_heater\_temperature temp = int(self.\_calc\_heater\_resistance(self.gas\_settings.heatr\_temp)) File “/usr/local/lib/python2.7/dist-packages/bme680/ **init**.py”, line 376, in \_calc\_heater\_resistance var1 = ((self.ambient\_temperature \* self.calibration\_data.par\_gh3) / 1000) \* 256 TypeError: unsupported operand type(s) for \*: ‘NoneType’ and ‘int’ ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [November 1, 2018, 2:28pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/4 "2018-11-01T14:28:49Z")
Could you try running: ```auto python -c "from bme680 import __version__ ;print( __version__ )" ``` Or in a Python repl running: ```auto import bme680 print(bme680. __version__ ) ``` In both your cases I can’t see a `t_fine` entry in your calibration data which points to the `_calc_temperature` method failing or not being called, but no error has occured at that point. ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 1, 2018, 4:30pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/6 "2018-11-01T16:30:13Z")
> [@gadgetoid](#): > > python -c “from bme680 import **version** ;print( **version** )” python -c “from bme680 import **version** ;print( **version** )” 1.0.5 ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 1, 2018, 4:32pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/7 "2018-11-01T16:32:11Z")
No I have no i2c baudrate entry in `/boot/config.txt`. The sensor works perfectly in a Raspberry 3, it does not in a Raspberry Zero with Raspbian GNU/Linux 9.4 (Stretch). ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [November 12, 2018, 10:35am UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/8 "2018-11-12T10:35:54Z")
How’s it connected to the Raspberry Pi Zero- how’s the Pi Zero header itself connected? ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 15, 2018, 7:09am UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/9 "2018-11-15T07:09:47Z")
I reinstalled last Raspbian lite distro and rerun the full install script. The Breakout is connected as described in the website, to pins 1, 3, 5, 7, 9. I did not actually connect pin 7, but it should not harm, right? Now I get this error, both with python3 and python IOError: [Errno 121] Remote I/O error ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [November 15, 2018, 9:21am UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/10 "2018-11-15T09:21:42Z")
See anything with `sudo i2cdetect -y 1`? ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 15, 2018, 6:25pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/11 "2018-11-15T18:25:17Z")
> [@gadgetoid](#): > > `sudo i2cdetect -y 1` sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: – – – – – – – – – – – – – 10: – – – – – – – – – – – – – – – – 20: – – – – – – – – – – – – – – – – 30: – – – – – – – – – – – – – – – – 40: – – – – – – – – – – – – – – – – 50: – – – – – – – – – – – – – – – – 60: – – – – – – – – – – – – – – – – 70: – – – – – – 76 – ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [November 15, 2018, 8:00pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/12 "2018-11-15T20:00:13Z")
Sorry just saw that’s in your first post- _facepalm_ I’m not exactly firing on all cylinders! Hmm- that’s the default i2c address for the BME680. What on earth is going on- I wonder. Are you moving the same SD card between both Pi’s when testing? Do you have any other i2c devices to verify there’s not something wrong with the Pi Zero? Sorry if I retreat the same ground! ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [November 15, 2018, 8:49pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/13 "2018-11-15T20:49:05Z")
You say you don’t have pin 7 hooked up. Are you connecting it to the Pi via jumper wires? Is there a header soldered onto the BME680? ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 15, 2018, 10:02pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/14 "2018-11-15T22:02:05Z")
I have a luminosity sensor (tsl2561) to test. I could try and let you know ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [November 15, 2018, 10:05pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/15 "2018-11-15T22:05:51Z")
I soldered the header but nevertheless I’m using jumper wires, I have other jumpers on the second row and the header does not fit well. I have another breakout working on a Raspberry 3, maybe I should try if the problematic one works on the Raspi3 to understand where the problem is (whether the breakout or the Raspberry Zero) ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [November 15, 2018, 11:11pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/16 "2018-11-15T23:11:48Z")
Phil @gadgetoid , didn’t we see a similar problem in another thread where jumper wires were used? @alex.tower make sure the jumpers are all the same length, and away from anything that might cause electrical interference. Maybe even swap them out just in case one of them is a dud or something? ---
**Author:** ![gadgetoid](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/gadgetoid/32/13_2.png) [@gadgetoid](https://forums.pimoroni.com/u/gadgetoid)\ **Post date:** [November 16, 2018, 9:56am UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/17 "2018-11-16T09:56:36Z")
@alphanumeric yes, jumper wires can be a bit hit and miss! Due to anything from just poor quality connections/worn out cables, to coupling in noise or causing crosstalk between the data/clock lines. @alex.tower it sounds voodoo but if your jumper cables are still connected in a single ribbon you might want to separate them out into individual strands. ---
**Author:** ![alphanumeric](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.pimoroni.com/alphanumeric/32/2729_2.png) [@alphanumeric](https://forums.pimoroni.com/u/alphanumeric)\ **Post date:** [November 16, 2018, 10:15am UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/18 "2018-11-16T10:15:08Z")
I use the female to female jumpers all the time to connect sensor breakout boards to a Proto Hat or Proto Zero. Male header \< jumper \> male header. Mine are all separated. I’m fussy about what color wire I use for what function, and the ones I want to use are never all side by side ,lol. One thing I do do, when its going to become a permanent setup. Is remove the single shells from the ends and plug them all into a multi pin shell. So its all just the one plug with the wires in the correct order. ---
**Author:** ![alex.tower](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@alex.tower](https://forums.pimoroni.com/u/alex.tower)\ **Post date:** [December 1, 2018, 6:59pm UTC](https://forums.pimoroni.com/t/pimoroni-bme680-oserror-errno-121-remote-i-o-error/8404/19 "2018-12-01T18:59:15Z")
> [@alphanumeric](#): > > jumper wires Sorry, but I use jumper wires on my Raspberry 3 and another BME680 breakout without no issues, I do not think the problem is caused by those.