Connecting ESP32 to internet in LowPower setup.

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Joined: Wed Apr 17, 2019 8:06 am

Connecting ESP32 to internet in LowPower setup.

Postby vladoportos » Wed Apr 17, 2019 8:18 am

Hello all,
This might be a stupid question but I'm getting bit overwhelmed with possibilities and would like to focus on one that is the best.

I need connect multiple ESP32 to local LAN ( or Internet ) but I need it at low power 3.3V batteries, this mean sleep for about 24hours than wake up, check server if something changed specifically for that device ( so it have to broadcast identification first and than read the response ), if something changed than do action and back to sleep...

I do not need long distances like LPWAN ( which sounds great, low power and long distance... but licensed and need expensive hub to talk to normal web servers... )
Bluetooth - nice low power consumption, range is not that great though and I'm not sure if it can be made in a sense Server + many clients checking from time to time ( possibly multiple clients checking at once )
WiFi - classic solution that I understand , its just AP and clients.. simple enough.. battery inefficient though.. ( would be nice to have wifi mesh capability, but since like 99% of the devices will be in deep sleep, it would not work. I don't know though...gathering information about it now )

What else is there ? Some low power radio communication like LPWAN. or just stick with wifi and get a bigger batteries ? :D

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Joined: Tue Aug 21, 2018 5:28 am

Re: Connecting ESP32 to internet in LowPower setup.

Postby boarchuz » Thu Apr 18, 2019 3:12 pm

Does it matter how power hungry WiFi is if it's only going to be awake for 5 seconds once every 24 hours?

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Joined: Fri Mar 03, 2017 10:31 am

Re: Connecting ESP32 to internet in LowPower setup.

Postby JoeSensoric » Sun Apr 21, 2019 8:49 am

I have several battery-driven ESP32 boards running which wake-up, read sensors, start Wifi, send data with a single HTTP-request and go to deep sleep. That all takes 4 to 5 seconds. I made some calculations about battery consumption and the active Wifi part is the relevant part when you really power down all peripherals during deep sleep. For example I power the sensor chips with an output GPIO port which is possible if the sensor needs only a few mA. So in deep sleep there is no current to these modules.
Bluetooth communication would need much less power but is limited (as you wrote)

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