HiLetgo 1PC ESP8266 NodeMCU CP2102 ESP-12E Development Board Open Source Serial Module Works Great for Arduino IDE/Micropython (Small)

Dead on arrival. I didnt give up, and tried connecting it to an external power source, which made it come back to life. However, its no use to me if it cant be powered by USB as it was originally meant to. I believe that most of the units are OK though, and having it fully refunded, it is worth a try.

Would recommend for cheap wifi enabled microcontrollers

If you are going to run micropython on them they will run it fine. Go to the micro python web site (for windows 10) go through the install process for the esptool, when you get to flashing the firm ware set the baud rate to 115200. I believe the 9600 listed on the back is for the arduino ide serial monitor . these have 4mg flash so they will run it fine

Well i bought it to troll our internet network and it worked like a charm, u can kick everyone off your network, you can make fake networks to piss people off, and you can use it as a server so it checks all my boxes

arduino.esp8266.com/stable/package_esp8266com_index.json Doesnt work.

muy bueno y practico

Far superior to Arduino Uno - wifi is very easy to set up and opens a world of possiblities. 2MB of onboard storage allows for logging tons of data, or setting up a working web server. Over-The-Air uploads are a little finicky, but I havent tried to polish my process much.

Works very well, just make sure you use a charge and sync micro USB cable to power it, some cables do not work well. For programming, it, just watch a youtube video.

Great Product, as advertised

First off, this is a 0.9 pitch board, so it fits on a breadboard with an unused row on each side. Many other ESP8266 boards have a 1.1 pitch, which means you have to get creative to use them in a breadboard. I even have an ESP32 with a 1.0 pitch, where only one side gets an unused row of breadboard pins. It takes between 1 and 5 seconds to connect to my home WiFi. Once on the WiFi, it connects to my MQTT broker in under 2 seconds. When I publish MQTT messages to my broker, there is no perceptible delay before this board responds. I hooked it up to a BMP280 sensor, and verified the I2C pins work. I tested it with a servo using the built-in example program Sweep.ino. The HiLetgo website has a page for this board, but does not seem to have a link to the datasheet, or even the pinout. I finally found the datasheet and pinout on Components101 dot com. They have a page titled NodeMCU ESP8266 Pinout, Specifications, Features & Datasheet, which has both. If you do not see a COM port when you plug this device in, you may need to install a driver for the CP2102 UART (small square chip near the micro-USB port). That chip is made by Silicon Labs, and their site has a download for the 210x driver. In the Arduino IDE library manager (Tools -> Manage Libraries...), install the AdaFruit ESP8266 library. This will give you the ESP8266WiFi.h file needed for your sketches. #include <ESP8266WiFi.h> In the Arduino IDE Preferences, add a link to package_esp8266com_index.json, which you can search for on the web. Once you do that, you will be able to select this board from the Boards Manager. Once you have done all of that, it should work like any official Arduino board.