BME688 Sensor

Support
1

I am trying to setup the BME688 sensor bought from Pimoroni but when I run the test code below I get the following error message:

ImportError: no module named ‘breakout_bme68x’

The code I am using is:
“”“BME688 / BME680 demo
This demo will work for both the BME680 and BME688.
“””
import time
from breakout_bme68x import BreakoutBME68X, STATUS_HEATER_STABLE
from pimoroni_i2c import PimoroniI2C

PINS_BREAKOUT_GARDEN = {“sda”: 4, “scl”: 5}
PINS_PICO_EXPLORER = {“sda”: 20, “scl”: 21}

i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)

bmp = BreakoutBME68X(i2c)

If this gives an error, try the alternative address

bmp = BreakoutBME68X(i2c, 0x77)

while True:
temperature, pressure, humidity, gas, status, _, _ = bmp.read()
heater = “Stable” if status & STATUS_HEATER_STABLE else “Unstable”
print(“{:0.2f}c, {:0.2f}Pa, {:0.2f}%, {:0.2f} Ohms, Heater: {}”.format(
temperature, pressure, humidity, gas, heater))
time.sleep(1.0)

I have run the command below to setup the sensor but still get the same error message.
curl https://get.pimoroni.com/bme680 | bash

Any ideas?

Thanks Mike

2

What do you have the sensor connected to (and how do you have it connected?)

3

I don’t have the sensor connected as yet, I was connecting it over Stemma/QT (QW/ST)
once I got the software to run through with no errors.

4

Might need some more info about your setup to be able to help here I’m afraid - are you using a Raspberry Pi or a Raspberry Pi Pico?

5

It is a Raspberry Pi Pico with ‘rp2-pico-20220618-v1.19.1.uf2’ installed.

6

Ah OK - is that a version of MicroPython downloaded from the Raspberry Pi website? You’ll need to install our custom MicroPython version to have the BME688 drivers built in: Releases · pimoroni/pimoroni-pico · GitHub. You’ll need the Pico flavoured image - here’s a direct link.

Note that the example code may throw an error if you don’t have the breakout physically connected to the Pico, either by Qw/ST or by some other means.

7

I have now downloaded the correct UF2 file and it has gone past the initial error message.

I will now have a look at which I2C pins to use on the PICO

Thanks a lot for your help.

Mike

1 Like
8

Everything working fine now.

Thanks again for your help.

Regards
Mike

9

Hi Mike,

Would you be able to share which pins you used to connect your Pico to the BME688?
I can’t seem to find an official document on what that should be?

I found one for the BM280 and have been unsuccessful so far:

image
image1920×1117 112 KB

Source: Raspberry Pi Pico W: Wireless Weather Station - YouTube

For reference, this is my code:

from breakout_bme68x import BreakoutBME68X
from pimoroni_i2c import PimoroniI2C

PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
PINS_PICO_EXPLORER = {"sda": 0, "scl": 1}

i2c = PimoroniI2C(**PINS_PICO_EXPLORER)
bme = BreakoutBME68X(i2c)
10

Hi, I have connected the ME688 to pins 6 & 7
For the SDA & SCL. If that doesn’t work, try reversing the two connections.