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Wemos D1 mini pro and BME280 sensors

PostPosted: Thu Oct 26, 2017 1:23 pm
by tompat
Hi (first time poster here..)

I bought a bunch of Wemos D1 Mini Pros with the intention to build cheap temp/humidity loggers.

For sensors I got Bosch BME280 boards of AliExpress.
The seller stated in the ad "The board has selectable I2C address jumper (solder link GS2)" but when I got the boards there is not GS2 solder link or any other selectable jumper/link/whatever. My intention was to couple two of these boards to each Wemos and use the two different I2C addresses.

Since it appears the I2C address is not selectable, how can I connect more than one BME280 board to the Wemos? There is something called SPI, how is this wiired to the Wemos if I want to use multiple BME280 boards on a single Wemos?

Re: Wemos D1 mini pro and BME280 sensors

PostPosted: Fri Oct 27, 2017 3:02 am
by schufti
IF the module is useable on i2c and spi then there should be an SDO pin.
For i2c set CSB to Vdd (via pull-up, not direct!).
In i2c this pin is used to select address(0x76/0x77).