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Hi Brian.
After your comments, I looked at the specifications and found the following: SDA and SCL are not pure open-drain. Both pads contain ESD protection diodes to VDDIO and GND.
See the screen in the attachment.
Re-polarity cannot damage the device, as there is protection. I think it makes...
Hi Brian.
Can I power the sensor directly from the output pin (without MOSFET)?
Will this be the correct scheme?
In this case, the sensor will sleep with the microcontroller.
The maximum current that can be drawn from a single GPIO pin is 12mA.
Operating current BME280 is 0.4mA.
Hi Brian.
I do not have an oscilloscope.
I controlled the battery voltage value. When I put this mosfet, the battery began to discharge more slowly.
My station has been operating since January, but according to statistics, nothing is damaged. You can see the graphs at...
Hi.
You can use your sensors, but again I made a weather station :).
The board starts, sends data to backend (Node.js) and falls asleep for 5 minutes. To save battery power, the field effect transistor at pin D6 turns off the power to the BME280. The 18650 battery is controlled by input A0...
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