KeeYees 3pcs ESP8266 ESP-12E Development Board WiFi WLAN Wireless Module CP2102 for NodeMCU for ESP-12E for Arduino

I recently learned how to connect a variety of different types of inexpensive sensors to a NodeMCU ESP8266 and use its Wi-Fi capabilities to transmit sensor information to other Wi-Fi connected operating systems like Android and Windows etc. These little NodeMCUs are awesome and have been very reliable. I have used at least a dozen of them in different small hardware projects. None of these MCUs have failed yet. Some of the projects that I have used them in include: 1. Use a motion sensor to automatically turn my desk fan on and off when I sit down or leave my desk area. That project used NodeMCU, heat sensor, relay, fan, lcd display 2. Use a DC volt sensor and NodeMCU to send messages to my cell phone when my car battery is weak. That project used DC voltage senso, NodeMCU, IFTTT technology to get text msg to my cell phone. 3. Use switch and NodeMCU to send message to my cell phone when yard gate is opened and closed. 4. Used weight scale sensor with NodeMCU to weight items ranging from cotton ball to bowling ball. 5. Used Text-to-Speech module with NodeMCU to create a Voice Server so my various NodeMCU projects can use Wi-Fi to send messages to the Voice Server to speak. 6. Use temperature probe and NodeMCU to create a thermo logger that records temperature changes on a microSD memory card and can transmit the temperatures in a web page etc. It is fun and fairly easy to create a variety of different types of smart switches using different sensors, relays and these NodeMCU ESP8266 chips.

These things are great. There's a few available GPIO pins and one analog pin. They have more flash than some other versions, so I was able to put a whole web server with OTA updates where my friend's ESP8266 couldn't run it due to lack of memory.

Love these boards for ease of use and access to so many more pins than the common ESP-01. Being able to program directly via USB is a huge bonus, no level shifters or pushing buttons. No problems programming with either the Arduino IDE or VS Code/PlatformIO. Wifi works well and easy to set up using the WifiManager library. Consider this a huge step up from Arduino in terms of capacity and speed with the bonus of built in wifi. Prefer that the pins not be soldered (drop a star). They are hard to remove and maybe one device gets stuck in a breadboard but real projects need wires soldered which means removing the pins. Final thought: great for the price but given the number of ESP-32 devices now available for not more, I would probably pay a little extra for a much more powerful device.

This product is sold as a NodeMCU Lua board, and while the board itself is based on the NodeMCU board, it does not include the NodeMCU Lua firmware. In fact, the firmware includes no Lua interpreter at all, just the stock AT firmware from the ESP8266 module. This caused quite a bit of confusion when I first hooked it up and tried to follow the instructions written on the board itself. Although the seller does provide working instructions for getting the board to work with the Arduino IDE, that has absolutely nothing to do with "Lua". This is like selling a MicroPython board without MicroPython firmware (or even instructions on installing that firmware). One is supposed to include the other. The seller really should remove the word "Lua" from the title since the product is sold without a working Lua interpreter. This is a bit disappointing since it only takes a few seconds to flash the free and open source NodeMCU Lua firmware to the device. If I purchased these modules from eBay or some other sites, I might expect this lack of attention to detail, but not from an Amazon Prime seller. If I were just getting in to IOT and purchased these boards because they were supposed to be an easy way to get started, as the NodeMCU Lua board/fw were marketed as, I might easily get discouraged when I got "ERROR" every time I tried to type a command in the serial console (which turned out to be because the stock AT firmware was installed instead). That lack of detail discourages new makers. If you are selling a product as working as a specific way, and that includes selling a product that has written instructions on it (as this does on the bottom of the board), it should darn well work as expected. It costs less than a minute of time to flash the firmware and no money whatsoever. I was going to give three stars, but the seller did include working instructions for Arduino, so I will consider that as an attempt to make the product workable for the buyer, but considering how little of an investment it is to flash the firmware for the seller, and how much time that would save a new maker who doesn't know how to flash these devices yet, I have to dock a star for lack of attention to detail.

These 8266 12-5 Node-EMCU boards are a great buy for the price. These allowed me to get a few IoT projects off the ground. As I get deeper into the project I am looking into switching to the V1 8266 boards as they are smaller and would probably be more then sufficient for this project. The Pros - These boards are easy to set up, configure, and get working for ESP-8266 projects. Easy to use, headers already installed. The Cons - The board seems with be missing a clear layout guide. The top and bottom have different pin names. I was able to figure it out but a clearer pinout on the board would be helpful. Over all I would recommend these boards for anyone looking to get into Ardunio and or IoT projects that require wifi.

Everything you need to know to get these working is available in the item's description. I tested each of the three units with three different cables on two different computers. Nothing worked. Before writing a negative review, I decided to try one more cable. The board was recognized immediately and I was able to upload a sketch without any issues. If you're struggling to get them running like I was, try 4 or 5 (or 10) different cables. If you have correctly followed the instructions and installed the right drivers, they will work! Great product! Highly Recommend!

There are no manuals, no drivers, no links, not even a pinout. In the Arduino IDE you must select NodeMCU 1.0 ESP-12E module. The pinout matches the NodeMCU ESP-12E pinout. After that, everything is a breeze. Everything works, wifi works, pins work (although there are fewer actually usable pins than you think, look into NodeMCU pinout to be sure you know what you are getting). A+ product.

This is an excellent product. I ordered a kit of three - the first two I happened to use work fine. Yesterday I tried to flash ESPHome on the 3rd, however the product is dead. Return & support dates have since passed. Do I have any chance of getting a replacement or partial credit? I am planning to order another kit of 3 of these. Thanks for anyone with Amazon who cares to respond. MV, Montreal, Canada

Hello, if you are not seeing the COM appear when programming in Arduino IDE, follow online instructions, you may also need to check device manager to see if you have correct driver. I needed to download and install a driver from silicone labs.

Why put labels D0-D1-D2.... etc... if it's not at all the right digital pin. Check for pinout on Google. When you get this, this thing works good. Using it for Kombucha and MySQL connections, works great.

Came with one of the pins slightly bent but it was easy to fix and works fine. It's quite easy to flash it on Linux via nodemcu-tool. It's easy to get it stuck in a boot loop if you mess up, but easy enough to erase and reset it if that happens. I recommend programming a delay into your code to make it easier to fix.