ricardo.santos
Posts: 43
Joined: Thu Jan 18, 2018 12:18 pm

BME280 not detected via i2cdetect and heats a lot

Mon Jun 04, 2018 5:42 pm

Hi
i'm trying to connect the BME280 (temp+hum+press) sensor to raspberry Pi3B with I2C

Here is my connections https://github.com/Ricardosgeral/relier ... relier.png

I've connected VCC to 5V (specs say 1.8 to 5V) but i know most of people use the 3.3V. But I thought that should work as well...

The problem is that it does not work. I don't see the address when I do sudo i2cdetect -y 1. But I can see the address for the other I2C device (ADS1115).

Another thing. The sensor heats up to 50 degrees....That should not happen right?

If I connect to 3.3v i can't detect it as well and the sensor becomes also very hot (I've measured 40 degrees with multi-meter)

Any ideas? Is the sensor faulty? I'm i doing anything very wrong?

Anyone experienced this?

thanks

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DougieLawson
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Re: BME280 not detected via i2cdetect and heats a lot

Mon Jun 04, 2018 6:22 pm

Faulty sensor is the most likely fault. Abuse of Vdd is most likely cause.

BME280 datasheet wrote:The sensor provides both SPI and I²C interfaces and can be supplied using 1.71 to 3.6 V for the
sensor supply VDD and 1.2 to 3.6 V for the interface supply VDDIO. Measurements can be
triggered by the host or performed in regular intervals. When the sensor is disabled, current
consumption drops to 0.1 µA.
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ricardo.santos
Posts: 43
Joined: Thu Jan 18, 2018 12:18 pm

Re: BME280 not detected via i2cdetect and heats a lot

Mon Jun 04, 2018 6:34 pm

:shock: ok. I guess I killed it
thanks

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DougieLawson
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Re: BME280 not detected via i2cdetect and heats a lot

Mon Jun 04, 2018 6:36 pm

The Adafruit breakout board includes a small voltage regulator so you can power those with 5V.
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