Help setting up bme280 sensor

General Discussion
1

I’ve been trying to setup a bme280 with no luck. My printer is running on a ski mini e3 v2, and I have my raspi 3 b+ setup as an additional mcu. I queried the bme280 by running a py script through ssh and it works fine. I have also confirmed bus, baud in /boot/config.txt.
I keep getting: MCU ‘rpi’ error during config: Unable to open i2c device

here’s my printer.cfg sensor declaration:

[mcu]
serial: /dev/serial/by-id/usb-Klipper_stm32f103xe_35FFD6054250373725821157-if00

[mcu rpi]
serial: /tmp/klipper_host_mcu

[temperature_sensor chamber_sensor]
sensor_type: BME280
i2c_address: 118
i2c_mcu: rpi
#i2c_bus: 1 ;get error here that bus 1 is unknown;
i2c_speed: 400000

2

test this:

[mcu host]
serial: /tmp/klipper_host_mcu

[temperature_sensor enclosure_temp]
sensor_type: BME280
i2c_address: 118
i2c_mcu: host
i2c_bus: i2c.1

[gcode_macro QUERY_BME280]
gcode:
    {% set sensor = printer["bme280 enclosure_temp"] %}
    {action_respond_info(
        "Temperature: %.2f C\n"
        "Pressure: %.2f hPa\n"
        "Humidity: %.2f%%" % (
            sensor.temperature,
            sensor.pressure,
            sensor.humidity))}```
4 Likes
3

may I ask what you have isntalled on the pi to get the i2c up and running?
I already turned it on inside the /boot/config.txt

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1 Like
4

Im also cant easy find a good script to get it up and running.

5

Just enable I2C interface on your raspberry and it should work. Figured It out some time ago

6

Thanks you saved my life

7

Thank you for your help. I just got around to implementing this. It works! I had to change
i2c_mcu: rpi
But other then that your config works!

8

Thanks!!! Great work!