M308 add a new sensor

[moth4017]

@dc42 is there any info on how to connect and setup the BME280?

[Exerqtor]

@moth4017 said in M308 add a new sensor:

@dc42 is there any info on how to connect and setup the BME280?

It's been added to M308 for RRF3.5 and later at least.

Reguarding how to connect it i would guess you do it just like you would with a DHT sensor.

[moth4017]

@Exerqtor Hi the NME280 is an SPI device , so im guessing there is more to set up and im not sure which chip select pin is used.

[dc42]

@moth4017 the BME280 can be connected to the SPI daughter board connector. You can use any one of the CS pins on that connector.

[moth4017]

@dc42 Thanks, do you have to define the CS pin like this?

if i was to use spi2 CS2

M308 S1 P"spi2.cs2" Y"BME280" A"BME280"

[dc42]

@moth4017 yes it's the same as how you would define the CS pin for a PT100 or thermocouple board.

Accessing the 2 additional sensors in the BME280 is similar to how you access humidity on a DHT22. Here's how I configured a BME280 on a Duet 3 Mini:

m308 s11 y"bme280" p"spi.cs1" a"Ambient temp"
m308 s12 y"bmepressure" p"s11.1" a"Pressure[hPa]"
m308 s13 y"bmehumidity" p"s11.2" a"Humidity[%]"

[Exerqtor]

@dc42

I assume we don't connect/use the clock pin on the BME280 ?

[dc42]

@Exerqtor you need to connect the SDI, SDO and SCK pins of the BME280 to MOSI, MISO and SCLK respectively. And of course also connect CS, 3.3V power and ground.

[moth4017]

BME connected and working , i have used spi.cs2

M308 s11 y"bme280" p"spi.cs2" A"Ambient temp"
M308 s12 y"bmepressure" p"s11.1" A"Pressure[hPa]"
M308 s13 y"bmehumidity" p"s11.2" A"Humidity[%]"

A bit of info as the Pin out description on the BME not the same as Duet board

Duet Temp Daughter Board to BME 280
pin 1 .................................................. CSB
pin2 ................................................... GND
pin3
pin4.................................................... SCL
pin5 ................................................... SDA
pin6.................................................... SDO
pin7
pin8................................................... VCC
pin9
pin10

[Tinchus]

Hello all. Just to confirm: using the BME280 is not possible yet on version 3.4 versions of firmware?

[jay_s_uk]

@Tinchus correct. its part of 3.5

[Tinchus]

@jay_s_uk Hello Thanks for the answer, then I should update to 3.5 beta to test this.

Docs talk about connecting the BME280 to the temperature daughter board. I have a thermocouple doughter board, it will work?

[jay_s_uk]

@Tinchus depending on which board you have. best off opening a new thread