Review on 🔌 HiLetgo ESP8266 NodeMCU CP2102 ESP-12E Development Board: Ideal for Arduino IDE/Micropython; Large Size by Andrea Bogenschutz

These things are amazing. I currently use 3 of these with a small 64x128 OLED display and a DHT22 sensor in various places around the house. All of this is built using the Ardunio IDE. I also added some NTP code I found online and now every board syncs its clock with NTP so it's almost like having an RTC built in (as long as you have an internet connection, at least when you turn on the power or restart). Device). One of the coolest features is the ability to use the ArduinOTA package, so now I can do code updates wirelessly over Wi-Fi after writing source code to each board. There are few reasons why I might use an Arduino board instead: Analog inputs - there's only one built in. Most of my analog input sensors already offer SPI or I2C interfaces, so this is not a problem for me. You can also choose an Arduino if you absolutely need a 5V device (that's 3.3V) or something battery powered where you need the lowest flow possible. I'm not sure yet if I can turn off the wifi radio in this guy to get similar low power consumption, but for more than 90% of my projects it just became my compromise. Please note that the one I received from HiLetgo seems better than the other two I later received from another seller. HiLetgo can be programmed via USB at the full speed of 921600 baud, while devices from other manufacturers can only be reliably programmed at 115200 baud. It could just be a bunch of less precise CPU dies or who knows what. The difference in programming speed is small, so it's ok. Overall I am very happy with these boards. I've attached a photo of my temperature/humidity sensor project. Uses only NodeMCU, breadboard, I2C OLED display, DHT22 sensor, 10kΩ resistor and 7 jumpers. I can access any of my three boards from any browser to get metrics. You can do without the OLED display and two jumpers if you only want to read your data via the browser. Quick addition: I just got 3 more from HiLetgo and they can all be programmed to the full 921600 baud rate. So FWIW, the HiLetgo "brand" seems to be better than the batch of 2 I got from another seller, which could only be programmed reliably at significantly lower speeds, although they still read the code well after programming carry out. I still like these NodeMCUs :). One more addition: I made a github repository (search github.com for "esp8266_arduino_temperature_nodes") with source code. It's a bit of a hodgepodge as it's just an experiment while I play with the board's capabilities. (Update: Added ILI9341 TFT display, see picture) Hope someone finds this useful.