Query about replacing DHT11 with BME280 + Use as a Flood Detector

[aenertia]

Hi, we are just about to move into our first home, and I have plans to automate a bunch of Ventilation and setup a Sensornet I was planing on building a series of ESP12/32 relay controllers into the back of swtich plates to control extractors. But haven't quite finalized on what I am doing for the Sensor-net.

The Higrow looks like it might be easier than hand building up a WEMO Mini with the right sensors

I am really not a fan of the DHT11 used tho; the BME280 is a much nicer sensor so would probably replace it in place of the DHT11 on your design; has anyone attempted this? If not what GPIO's/I2C's are used off the ESP32 - and what is still available?

Second question - the Water sensor, I am mainly interested in our subfloor moisture level for this application it's perfect.

However for the Bathroom and Washhouse I am thinking if I place these in the corners on the floor it should provide flood detection sensor as well. Again has anyone tried this - is there any gotacha's.

Third and last question - with a random 18650 inserted and with readings/wakeup say every minute - what sort of battery life should I expect. Spec's say 17hrs which is I guess continuous, but if they are only collecting and using MQTT or similar to log them over the air; what sort of battery replacement/recharge cycle are we looking at - and also is there a charging circuit for the battery incorporated via the microusb 5v?

Cheers

@aenertia