7PCS ESP8266 ESP-12F Development Board NodeMcu D1 Module for ESP8266 ESP-12F 4M Bytes WLAN WiFi Internet Development Board

These work great! I haven't had any issues with them whatever and they do exactly what they are supposed to do. I'm an avid Arduino (or clone) hobbyist. I love the form factor of these little ESP8266 boards. Just big enough to be able to work with them easy enough, but tiny enough to fit in even the tiniest project boxes (ok well almost; still pretty cool!)

Great board. Small and everything worked perfectly. Be aware the silkscreen PIN numbers on the board are not the same numbers you use in the IDE. Look for a pinout map to get the correct numbers.

These are all working well, after I figured out that certain pins should not be used as inputs because it keeps the ESP in the Boot state and it would not start. Nothing wrong with the device, User error.

Fast, easy, and simple for small projects.

The ones that I received appear to be a good clone of the WEMOS D1 mini. Wifi access shows good strength to my APs. They have been working flawlessly for about 3 weeks now - I will update if there is any change in reliability.These are working perfectly for the use case I have. I am using one of these to connect to my boiler with a dual relay - this controls the heat to the 2 zones I have in my house. I have connected the others with dht11 sensors so they can report temperature and humidity. For a small amount of money, I was able to build my own "smart" thermostat with remote sensors by integrating these into Home Assistant. Tasmota firmware works fine with these boards.

Not sure what the other reviewer’s issue was who said the board fried. I soldered all of the pins between the relay board and the d1 and it works just fine. Maybe he put the board on backwards or something?

Solo programé el modulo aun no pruebo el relé pero funciona correcto y es fácil de programar yo usé el modulo para IOT y funciona al 100%

Work as advertised, no issues