KeeYeesDevelopment Board WiFi WLAN Wireless Module for ESP8266 for NodeMCU for ESP-12E for Arduino (5pcs)

Works great. All of them were programmed and they functioned properly. No issues. Would buy this brand again.

I'm using this board as platforms for network programming for embedded systems courses. Since in the particular case hard-real-time is not a most important feature I use it with micro Python firmware that is available for free.One of my colleagues uses the same board to teach Lua.In 2019 I purchased a few boards for my son for his school projects. It can be used with Arduino IDE and Arduion=flavor of C++ for real-time applications.Some of my students set up a Node-JS IDE environment to program the board in C++ using the professional-grade environment instead of the Arduino. This kind of environment is best for my liking. However, the procedure to set it up was not trivial.Another of my students showed me the board used in the NodeRED visual IoT engine. She evaluated that it was easy to set up and use several ESP boards with a NodeRED engine running on a RaspberryPi.So my conclusion is that it is good for teachers, good for students, and good for hobbyists. Of course, it is not of industrial durability so it is probably only good for proof of concept in industrial settings.Watch out for breaking the micro USB socket by rough handling of the board dangling at the end of a micro USB cable. Some of my students reported damaged sockets if they were not moving it around without a care. You cannot just throw in a board into a laptop bag and move around and expect it to survive. This did not happen to me yet though.

They work well and good price.

These boards came individually packaged in anti-static packaging, protected in a cardboard box. The pins are pre-soldered with the pins facing the bottom and solder joints on the top of the board. Plugged these boards into my computer, and every board worked perfect. Each board accepted the firmware flash without any issues. These boards do NOT come with USB cables so make sure to have some on hand, or purchase those as well.

Muy versátil y práctico. Solo me gustaría que tuviera puertos de 5v.

GOOD QUALITY. Product in daily use. Worth every penny.

Works well, will be put into use when I get all my Christmas Light supplies in order to permanently affix LED Strips to my house.

I have now purchased 30 modules, all work good, easy to program.

After a disheartening experience with another product from KeeYees(Nano v3 clones), I was hesitant about their ESP8266 NodeMCU ESP-12E Development Boards. However, these boards were a delightful surprise. Contrary to some negative reviews, all five units in my purchase worked flawlessly. I used them with WLED for a wireless lighting project, and they performed excellently.Each board connected seamlessly to the WLAN, and the CP2102 USB to serial converter made programming and debugging a breeze. The stability and reliability of the wireless connections were impressive, showing no signs of the issues that often plague such modules. It was a breath of fresh air to work with hardware that not only met but exceeded my expectations.The success of these boards has restored my confidence in KeeYees products, at least in the realm of ESP8266 modules. Their performance was consistent across all units, and they integrated smoothly with my existing setup. For anyone looking to delve into wireless projects or needing reliable ESP8266 modules, I highly recommend the KeeYees ESP8266 NodeMCU ESP-12E Development Board. It’s a great combination of affordability, functionality, and reliability.

These are not the least expensive MCU's, but they're also not the most expensive.I was in a bit of a rush for these so didn't want to wait 2-3 weeks and they had 1-Day Prime Shipping so I went with these. From the time I pressed the send button it took16 hours until they were delivered to my doorstep, so that was great!I read through all the reviews, and I took most of the negative reviews that said that one or more was not working out of the set of five, with a grain of salt. Unless people know exactly what they're buying and how to program them properly, it's quite easy to blame the device when in fact it's operator error that is causing the problem.My use case here is for controlling LED lights and flashing these MCU's with WLED firmware. Yes, the ESP32 boards are faster and can handle more instructions faster for those with multiple strings of lights, but for small lighting projects, these ESP8266 boards are just fine!These particular boards are a bit smaller than other 30-pin ESP8266 boards and measure approx. 49mm x 26mm which is important to know if you're looking at some 3D printed enclosures. Many other brands have a slightly larger form-factor of approx. 58mm x 32mm.All 5 of these are boards FAILED to flash properly when I used the WLED Web Flasher. If this happened to someone else who didn't know that there were other ways to flash them, this review might very well be a 1 star review with claims that all 5 were faulty (when they are not) and a return may be initiated.From what I've read, from people who know quite a bit more than me about it, the WLED Web Flasher fails for up to 50% of everyone who uses it. For me, I could get none of these MCU's to flash with the WLED Web Broswer. I had ZERO problems when I used Tazmotizer to flash them. It recognized all 5 boards instantly, erased them properly and then installed the WLED firmware on the first try on all 5 boards. Zero issues!!Just be aware, that if you manually flash them with a program like Tazmotizer, that it will not install the Wi-Fi connectivity, and you have to do that separately after they are flashed.Once you have them flashed, disconnect them from your computer, and apply just power to them with a phone charger or some other 5 volt power supply or battery bank. Once it powers up it will broadcast a Wi-Fi SSID of WLED-AP that you can scan with your computer. Connect your computer or laptop or phone to the WLED-AP but UNCHECK the "Connect Automatically" as you won't use that access point again once it's set up. Once connected to WLED-AP (password is wled1234 if it asks) it will open up a WLED web browser page with an option to set up your wi-fi. Make sure that the page has loaded fully before you select anything. From the Wi-Fi setup page you can enter in your own SSID network name and password, and once that is saved, you can disconnect from the WLED-AP, and reconnect to your normal home Wi-Fi network and you should then have control of your ESP8266 board wirelessly through your Wi-Fi using either its IP address or whatever common name you selected in the Wi-Fi settings so you can just type in that common name with a .local at the end and you'll be all set! If anything doesn't work through this process, especially after you flash the firmware or just after you've set up the wi-fi, just try power cycling the MCU first and that should solve most of your problems.I was initially somewhat skeptical due to some of the negative reviews, but I can assure you that all five of these flashed properly once I used a proper flashing program, and all seem to be working absolutely fine and as they should be. And with one day shipping, I have absolutely nothing to complain about.I'm very happy with all 5 MCU's and highly recommend them. Good luck.

The media could not be loaded.  I'm using these to install WLED on them and hook up to my BTF Lighting light strips. They are very easy to use. My only negative thing to say about them is that they are easily fried. I burned up 6 of them in the space of a week trying to get my lights working. I'm not very good at soldering yet so I'm assuming I made some bad connections but I do wish they were a bit more resilient so I wouldn't have to replace them as soon as that happens.They are cheap to replace though! So not a huge deal.

Fast delivery. Boards are good quality and well packed for shipment. I just tried the first one and everything works (I use generic cp2102 USB driver and ESP8266_RTOS_SDK from Espressif with some idf compatible components).This board has 2MB of flash. I am guessing that's why they are slighly cheaper.It says it's "KeYeStudio" board, but honestly on their website boards have different markings (on the board and the CPU itself)

when I first received them, I was a little concerned if they were going to function, as they were smaller than the previous ESP8266's that I have purchased in the past. All Five are working great and I really like that these ESP's are a little smallerThanks for selling a good product at a great price. These will come in very handy for my LED project XMas lights for my home.