HiLetgoOTA WeMos D1 R2 CH340 WiFi Development Board ESP8266 ESP-12F For Arduino IDE UNO R3

It works great on my trains and made them more fun

I have been replacing my Arduino Uno boards with this board so I can control things over the Internet. When you use the Arduino IDE make sure you select Wemos D1 R2 and use D0, D2, A0 etc. for the pin number instead of just a number. The Arduino compiler does the pin number translation. I used RemoteXY to generate my displays for my iPhone. It has more widgets and makes better looking displays compared to the Arduino cloud.

OK, it's a bit out of date as Wemos has their mini now and the ESP32 is out but it's still a nice way to play. The USB port handles the chip programming pins with DTR and RTS serial port lines so firmware upgrades are simple. The power supply has a step down from the coaxial connector to a 5v bus that then runs the typical 1117 regulator for the 3.3v. There are power good LED's for both the 5v and 3v3 busses. Note that there is no level shifting so this is a 3.3 volt logic level on the pins, not the typical Arduino 5v. It appears that the ADC pin has a 2:1 voltage divider (22k and 10k resistors) which helps protect it and allows up to 3v on the pin.Since the ESP12 module is a bit short on GPIO compared to the Atmel in the Arduino, these are all on the left expansion sockets while the power is on the right. The ADC is the only IO line on the right in its usual place for an Arduino board. Board labeling is good but one does need to be careful as there are some conflicting pin numbering schemes out there.I loaded micropython with no hassles and it does its thing. The board profiles for the Arduino IDE are available and that should make simple firmware development in that environment an easy thing, too.Nice to have something with so much capability that operates in a standard and well defined way with a lot of community support out there.

I will probably get it working SOMEDAY! I thought it would plug in to my Arduino Mega board.First, I admit I'm no Arduino expert so I missed the UNO term (my bad) I cut the pins and soldered them in (this POS had no directions of any kind). OK so I've been a electronics hobbyist for 64 years I can solder a row of pin).I discovered the significance of that UNO term when I tried to seat the pins they are not the same as the spacing on the Mega board. Bottom line so far doesn't work. Bad support, no directions (not even a QR code to find help.) there are better solutions out there.

I was a bit concerned when purchasing this product because of all the negative reviews. Anyone who knows anything about Ardunio boards would know this is a Wemos D1 R1. This is indeed and Wemos D1 R1 nothing more nothing less. This is a solid board.

Wasted my money

Very pleased with the product!

This is not a shield for a Mega or Uno. It would work if you unsoldered all of the installed sockets and installed new ones with extended legs. I purchased it without noticing the open rows on the PCB definitely would not work for stacking.