Is this any different then the adafruit huzzah esp8266 breakout?

This unit can be programmed directly by connecting a micro-usb cable. The huzzah esp8266 breakout requires a ftdi cable for programming. The huzzah feather is closer to this unit but costs about 20 dollars.

Does this dev board have an integrated power regulator

Yes, it has a integrated power regulator. You can supply 5V (via USB or board pin) and the system runs on 3.3V. You can even pull 3.3V off the pin(s) to your external components, or supply 3.3V on the appropriate pin.

Is it meant to be powered by the USB port?

While you can power it from any USB port, the point is after you load your code to the board it's wi-fi and can operate independently with a 5vdc power source. The ESP32 CAM modules are really cool. You can set up a 5 camera home security system for about $50.

do I just plug this into my Arduino Uno? will it work with other stacked shields?

Short answer: no. But you can get a simpler (and cheaper, incidentally) esp8266 module (not the dev board) and use it to connect your Arduino to wifi. I suppose you probably could rig this up to work, actually, but it would kind of be overkill, and would NOT work with shields. A small basic esp8266 might be able to be worked into a proto shield for what you seem to be looking for. There are several tutorials on using the esp8266-01 (this is the -12e) to connect Arduino to wifi.

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🚀 Unleash Your Creativity with WiFi Power!

PACK OF 3 - Get more value with three modules to kickstart your projects.
READY TO GO - Direct download capabilities mean no resets needed for quick setups.
USER FRIENDLY DESIGN - Built-in Micro-USB and easy programming with flash/reset switches.
SEAMLESS CONNECTIVITY - Experience the power of WiFi 802.11b for effortless online access.
VERSATILE COMPATIBILITY - Perfectly integrates with Arduino IDE, Micropython, and Mongoose IoT.

The HiLetgo ESP8266 NodeMCU LUA CP2102 ESP-12E is a versatile WiFi development board designed for seamless integration with Arduino IDE and Micropython. This pack of three modules features built-in Micro-USB for easy programming, full I/O ports, and supports 802.11b wireless connectivity, making it an ideal choice for innovative projects.

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Brand	HiLetgo
Package Dimensions	10.23 x 6.23 x 0.23 cm; 260 g
Manufacturer	HiLetgo
Colour	Pack of 3PCS
Processor Count	3
Wireless Type	802.11b
Are Batteries Included	No
Item Weight	260 g
Guaranteed software updates until	unknown

HiLetgo ESP8266 NodeMCU LUA CP2102 ESP-12E WiFi Internet Development Board Wireless Open Source Serial Module Works Perfectly with Arduino IDE/Micropython 3pcs

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