ESP32s are pretty cool and cheap (~$10). Builtin wifi and bluetooth. Can run at 3v on a LiFePo4 battery. About 100-200ma. Good API. They have LORA ESP32 boards for 1km+ communication for $25 which you can use to connect to the LORA Wan for when the SHTF and you need to setup a low-bandwidth encrypted messaging grid in your general area.
https://www.amazon.com/MakerFocus-Development-Bluetooth-0-96inch-Display/dp/B076MSLFC9/
The new Atmel chips are pretty low in the power consumption department, but once you start adding wifi and other useful peripherals the CPU eats up less of the overall power consumption pie.
ESP32-CAM is also pretty decent if you have a project that required low power and lowish-res video.
This guy is pretty good in the SOC department: https://odysee.com/@AndreasSpiess:2
ESP32s also have a problem (like their 8266 cousin) in which they spew out wideband noise right around 318MHz. Since there are things that operate at 320MHz, including my garage door operator, they're absolutely useless for me. This is leaking out of every spot on the device, including the antenna.
I designed a whole range of 8266 devices before figuring out that it was killing everything that ran in the 320MHz area. The Arduino WiFi is expensive, yes, but it's a much better chipset when trying to play nice with other radio-operated devices.
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