BME280 Weather station projekt - Arduino Uno

Using Arduino Project Guidance
1

Hi, i am quite new to the Arduino and are trying out different projects.

Just got this BME280 sensor as attached.

And i have the Arduino Uno R3, but i am not sure how to connect the sensor?

Ofc ground goes to ground.

the VIN: Does that goes to 3,3V or 5V

And where do i find the SCL and SDA connections on the Arduino?

I hope someone can help me

BME 280 4 pin.png

2

Yes, GND to GND. For Vcc, 3,3 or 5 Volt, check the specifilation for that board. It might be possible that the BME 280 wants 3,3 Volt supply, and logic. In that case You need a level shifter, 5.0 to 3,3 volt between the UNO and the BME 280.
The UNO has a 3,3 supply to use but check the logoc level. The UNO uses 5.0 Volt.
An UNO usually have the SCL and SDA on the edge of the long connector, near the reset button and the USB connector. Look at the back side of the UNO if You don't find it on the front side. Also a pair of the analog inputs work, A0/A1 if I'm right.

3

I would suggest you first review several of the tutorials that you will find by a doing a Google search on;

'BME280 Weather station projekt - Arduino Uno'

A further search on 'Arduino UNO pinout' should help you find the SCL and SDA pins.

4

Pay attention to the note about pull up resistors needs 4.7 K to 10K

5

Seems that module has a 3.3volt regulator, level shifter, and 10k pull up mounted on the back.
Always better to post a weblink to the part, instead of just a picture.

If it's what I think it is, then the module can be powered from 5volt, and connected directly to the SCL/SDA pins of the Uno.
Leo..

6

@Wawa
Where did You find that spec? I have tried. I have one board with 6 connectors, running both SPI and I2C, and it is the 3.3 volt version.
I have ordered but not yet received a 4 connector board that I hope runs from 5 volt, equipped with the level shifter.
Sorry for interviening, hope it will spread some knowledge to Forum members.

7

This ebay link, second image, shows a 6-pin fet level shifter a 10k pull up resistor array, and a 3-pin voltage regulator on the back.
Leo..

8

Hi Wawa, it is this product.. https://www.aliexpress.com/item/3In1-BME280-GY-BME280-Digital-Sensor-SPI-I2C-Humidity-Temperature-and-Barometric-Pressure-Sensor-Module-1/32847825408.html?spm=2114.search0104.3.2.55922389wP898C&ws_ab_test=searchweb0_0,searchweb201602_5_10065_10068_318_319_317_10696_450_10084_10083_10618_452_535_534_10304_533_10307_10820_532_10821_5023915_10302_204_10059_10884_323_10887_100031_320_321_322_5727715_10103_448_449_5727815,searchweb201603_45,ppcSwitch_0&algo_expid=0190f81b-fe01-412b-a830-5c33ad470194-0&algo_pvid=0190f81b-fe01-412b-a830-5c33ad470194 do you know if you can connect that the way you explain?

9

With boards from Ebay/Amazon/Aliexpress etc. you can only guess,
but that board looks exactly the same as the one in the ebay link.
Leo..