For my oil tank monitor I see an RSSI of -75 to -85 and a transfer time of 1.5 to 2 seconds. Transfer time is from wake up through sensor data collection, sending the data to my MQTT server and back to deep sleep. This is in a fairly clean WIFI environment. There's a screen shot in my post here: htt...

Perhaps someone will correct me if I'm wrong here, but .. . I don't think you can do this directly. An ADC needs a reference to measure against and the ESP32 does not have one. I know some have said there is a 1.1v reference, but I think this is just the default 0db input range. It is so variable (1...

Perhaps the ESP could wake up every 2 minutes and check the readings against the last lot sent.
Then it would only need to alert you to a change. Depends on how quickly the data changes though.

If you don't really need the data to actually be sent every 2 minutes, you could wake up every 2 minutes and just log the data before going back to deep sleep. Then once per hour send it over WIFI. That would save you a lot of power.

Guys, seriously, does ESP32 on battery project(using wifi of course) even exist? I did alot of search and cant find anything usable. I am using an ESP32 to monitor heating oil level. It takes a reading every hour and transmits that back over WIFI to my MQTT server. It actually sends a data blob con...

This should help:
https://github.com/espressif/arduino-esp32/issues/449

It can sense a magnet and would make a good wifi door open detector, but It's the wrong choice for current measurements.
There's an Arduino example showing how to use it.
Try it with a magnet and you will see where it is sensitive and how much.

I have a similar requirement. I will be using the ESP32 to log data every 10 minutes and then a user will come by to download the data via wifi periodically (once a week to once a month). A deep sleep mode that could wake up when the user comes by would be ideal. Currently, I'm around 110mA and hav...

I've not used them, but there are arduino modbus libraries on github. Have you tried those?