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lmarzen / esp32-weather-epd

A low-power E-Paper weather display powered by an ESP32 microcontroller. Utilizes the OpenWeatherMap API.
GNU General Public License v3.0
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5v or 3.3v version for the BME280 sensor? #47

Closed hatute closed 10 months ago

hatute commented 10 months ago

In the official wiring diagram, the BME280 is connected to a 3.3v power output, but when I am going to put the order, I found that the model on it need the 5v power input and there is also a BME280 with 3.3v. I just want to make sure which version of the BME280 should we use? Or both of them work?

Xnip2023-09-11_23-39-40 截屏2023-09-11 23 38 37 截屏2023-09-11 23 51 25
lmarzen commented 10 months ago

I've tried it with both the 4pin and 6pin versions and have had no problems.

The BME280 itself needs a voltage supply between 1.71V to 3.6V. https://www.mouser.com/datasheet/2/783/BST-BME280-DS002-1509607.pdf

The 6-pin one exposes both the I2C and SPI Interfaces. It can operate between 1.71V and 3.6V.

The 4-pin one exposes the I2C interface only (no SPI), but it includes a voltage regulator and MOSFET logic level shifters and will operate at either 5V or 3.3V. Really the 4-pin version can operate between 1.71V and 5V.

TLDR: you can buy either and it will work just fine :)

hatute commented 10 months ago

I've tried it with both the 4pin and 6pin versions and have had no problems.

The BME280 itself needs a voltage supply between 1.71V to 3.6V. https://www.mouser.com/datasheet/2/783/BST-BME280-DS002-1509607.pdf

The 6-pin one exposes both the I2C and SPI Interfaces. It can operate between 1.71V and 3.6V.

The 4-pin one exposes the I2C interface only (no SPI), but it includes a voltage regulator and MOSFET logic level shifters and will operate at either 5V or 3.3V. Really the 4-pin version can operate between 1.71V and 5V.

TLDR: you can buy either and it will work just fine :)

Thank you for the thorough explanation, it totally solved my confusion ;)