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

I used these for a WLED project. It worked perfectly and was really easy. The value is great, I can make inexpensive LED projects and control them from my phone. If you have issues connecting, make sure you connect to 2.4g wifi. You use a fraction of the memory for the project. The usb port is tight and not sloppy or loose. Great product!

I made a WiFi filament detector sensor with this HiLetgo ESP8266. I followed instructions from a YouTube video and made a few adjustments to the sketch to make a filament detector sensor for my modified Creality CR10 3D printer. I am using an Intel NUC and Ubuntu. This HiLetgo ESP8266 board is connected to a microswitch that the filament rides on. When the filament runs out the switch opens and sends a signal to pause my 3D printer until I reinstall new filament.It works great, I did have issues with programming it through the Arduino IDE but that is because I am an amateur programming Arduino.

Once the drivers were installed - ran into a couple of glitches but essentially my second attempt at loading the drivers worked. Once past that - the rest was a breeze. I was able to build several prototypes to test out the functionality.Board is well made - can't see issues with the soldering or pins. HiLetGo is becoming my go to seller for Arduino related products. Most of the technical details are already listed in other reviews.One thing I found out (was unaware) - if you power the board via USB then the Vin pin provides 5V output for other sensors. Can't provide high current in my testing it easily tolerated a few milliamps.I used three boards to build #1. Web Server with sensors sending data to remote #2. Web Client with OLED SSD1315 display and #3. Energy Meter using an INA219 module reporting current and voltage.To use the SDA & SCL pins for serial communication for LCD or OLED displays for example, you need the following in your sketches:#include <Wire.h>#define I2C_SDA 4 /// ESP8266 NodeMCU SDA pin GPIO4 = D2#define I2C_SCL 5 /// ESP8266 NodeMCU SCL pin GPIO5 = D1// add in your setup sectionWire.begin(I2C_SDA, I2C_SCL); /// Identify SDA & SLC pins for ESP8266 NodeMCUSome additional information for pin mapping from my notes. Hope it's helpful for others.D0 = GPIO16; Wake [connect RST to D0]D1 = GPIO5; SCL Serial Clock -D2 = GPIO4; SDA Serial Data - #include Wire.h & Wire.begin(SDA, SCL);D3 = GPIO0; Using 0 or D3 both acceptedD4 = GPIO2; using 2 or D4 both acceptedD5 = GPIO14;D6 = GPIO12;D7 = GPIO13;D8 = GPIO15;D9 = GPIO3;D10 = GPIO1;LED_BUILTIN = GPIO16 (auxiliary constant for the board LED, not a board pin);

I have used these daily for years for running WLED with 5v ws2811 all powered off usb, and have been quite happy with them for that.Today I was going to try a new circuitpython project and discovered that these boards have not been supported by circuitpython since 3.x, which is about 7 years old, which is an eternity in microcontroller python land.Micropython does still support this board as of January 2025, though given the reasons that circuitpython stopped supporting it (too little ram after loading the network stack) I'd imagine that there are limitations there as well, so if you want python, maybe go with something else.

I recently purchased the HiLetgo 3pcs ESP8266 NodeMCU CP2102 ESP-12E Development Boards for a custom LED project I had in mind. After spending some quality time with these boards, I'm thoroughly impressed and feel compelled to share my experience.First off, the ease of use is remarkable. As someone who appreciates the nuances of DIY electronics but isn't a seasoned expert, I found the setup process to be straightforward and user-friendly. The boards were compatible with my existing software setup, and I didn't encounter any significant hurdles during the initial programming phase.The real magic happened when I started using these boards for my custom LED setups. The ESP8266 NodeMCU's ability to effortlessly drive and control LEDs was a game-changer. Whether it was for basic lighting projects or more complex, multi-colored LED arrays, these boards performed flawlessly. The Wi-Fi capability is also a huge plus, offering the convenience of wireless control, which is perfect for smart home applications.I must also commend the stability and reliability of these boards. Throughout my projects, they maintained consistent performance without any significant glitches or overheating issues. This reliability is crucial when you're knee-deep in a project and need your components to perform without a hitch.In terms of value for money, this pack of three is an absolute steal. The quality and functionality you get for the price are unmatched, making these boards a must-have for anyone into DIY electronics, especially LED projects.To sum up, the HiLetgo ESP8266 NodeMCU Development Boards are a fantastic investment for anyone looking to delve into custom LED projects or general IoT applications. Their ease of use, reliability, and excellent value make them a standout choice. I highly recommend these to both novices and seasoned tinkerers alike!

These are great little micro controllers. I used to play with the basic stamps but these are leagues more powerful. The Wifi capability is what I like best. I use one of these to monitor the temperature of my freezer and it will email me if the temp gets too high which means one of the kids left the door open!I have a 2nd one that monitors temperature and humidity of my dehydrator. I use it to dry 3D printer filament. It will also email me when the filament is done drying.