SongheMega2560 + WiFi R3 ATmega2560+ESP8266 32Mb Memory USB-TTL CH340G

This board works fine but there is one thing to note. Make sure you use the correct mapping of files when burning the firmware to the flash. This uses a 4 mByte flash, so you need to find a .bin file set that matches. The factory all in one binaries I found I could not get to work. Once you get past this the board works great. I went to the makeraI website and followed the ESP8266 programming instructions, using the NonOS 1.7.4 AT set, using the 4MB location table.

These things are amazing, they have the power of the Mega, they have a Wi-Fi chip built on, which you can use a variety of ways but connecting it to one of the serial ports is my favorite. It has external Wi-Fi antenna connection point, it’s very reasonably priced!Having used this board I have found one issue that I have not been able to resolve, it seems that it doesn't have a lot of power, which shows up when you add a shield to it. I added a DMX Shield but the board will not power it (my belief), if you take a regular Mega board (no integrated WIFI) the DMX shield works great. Still looking for answers but this maybe a problem - UPDATE I was using a USB hub, that could not supply enough power, removing that and coming directly from Computer solved power issue!

Board seems fine. They sent the wrong cord for it though, which is annoying.

This is a great board at a great price, but I do not recommend it for beginners. Getting the ESP8266 working and communicating with the Mega was a challenge with the limited documentation. I have done other Arduino projects before this which really helped. Make sure you have the USB 340 serial driver installed and follow instructions for getting the Generic ESP8266 working. I used RemoteXY to build my iPhone displays.

You have to know what you are buying, setup up is way more complex that what I thought, the performance is as expected, but I will think twice before buying this again as the WiFi is not as plug and play as I imagine it will be.Nothing wrong with the product that is why I give it 4 stars (as is might not be for entry level person)

It took me a few hours of reading and research to make it work. I would give another start if the seller included documentation and that the ESP8266 came with updated software I had to update the AT version to make it work and most of the online examples I found use Serial1 (pin 18 and 19), the board hardware comes for Serial 3 (pin 14 and 15) the switch 1 and switch 2 need to be set to the correct potion, was horrible figuring all this out without any documentation but I make it work.

Works as advertised. I didn't have any problem uploading to the esp8266 or the arduino mega. I also didn't have any issue passing serial from esp6266 to arduino.When sending serial from esp8266 to arduino, dip sw 1 and 2 must be on. The toggle sw also chooses where you send the serial from esp8266, either to serial 0 or serial 3 of the arduino. If you choose serial 0, be sure dip sw 3 and 4 are off as this will conflict with the onboard uart.Not sure what the mode sw next to esp chip does yet.But I have successfully connected to wifi to get time from ntp and pass that as serial string to arduino to display on common anode led array for time display.

I am very experienced with Arduino and have successfully used boards of similar design before. The two boards I received would not connect the Atmega 2560 to the USB port when DIP switches 3 and 4 were set to on. They would connect only when switch 7 was also set to on, which indicates that something about the design of the board is not correct. Even then the boards did not communicate between the 2560 and the ESP chip.The seller basically ignored my detailed description of the problem, and sent unhelpful suggestions like "use short cable" "board needs power" and "take picture of switch."