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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HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Large)

HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Large)

Product ID: 170107353

Details

Brand
HiLetgo
CPU Model
MediaTek
CPU Speed
80 MHz
Memory Storage Capacity
0.5 MB
Model Name
NodeMCU LUA

⚡80 MHz CPU speed for efficient processing

📶802.11b Wi-Fi for instant IoT integration

🔌Built-in Micro-USB for seamless connectivity

€ 38.20

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Description

🚀 Code smarter, connect faster, create bigger!

WIRELESS FREEDOM - Built-in 802.11b Wi-Fi ensures your projects stay connected in the smart world.
ARDUINO IDE READY - Fully compatible with the latest Arduino IDE and MicroPython for versatile development.
TRIPLE POWER PACK - Three development boards included to fuel multiple projects or rapid prototyping.
COMPACT YET MIGHTY - Powered by an 80 MHz Espressif CPU with 0.5 MB memory for smooth IoT applications.
PLUG PLAY PROGRAMMING - Integrated flash & reset switches make coding effortless and fast.

The HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Boards are compact, Arduino-compatible Wi-Fi modules featuring an 80 MHz Espressif processor, built-in Micro-USB, and flash/reset switches. Perfect for IoT projects, these open-source boards support Arduino IDE and MicroPython, enabling rapid prototyping and seamless wireless connectivity.

Specifications

ASIN	B081CSJV2V
Best Sellers Rank	#785 in Single Board Computers (Computers & Accessories)
Brand	HiLetgo
Built-In Media	3pcs HiLetgo ESP8266 NodeMCU CP2102 Development Module
CPU Model	MediaTek MT8125
Compatible Devices	ESP8266
Connectivity Technology	Wi-Fi
Customer Reviews	4.6 4.6 out of 5 stars (1,399)
Manufacturer	HiLetgo
Memory Storage Capacity	0.5 MB
Model Name	NodeMCU LUA ESP8266 CP2102 ESP-12E
Number of Items	3
Operating System	Minimalistic operating system or RTOS for microcontrollers
Processor Brand	Espressif
Processor Count	1
Processor Speed	80 MHz
RAM Memory Technology	LPDDR3
Total Usb Ports	1
Wireless Compability	802.11b

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€ 38.20

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In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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