Question 1

What are proper switch settings? Can talk to mrga 2560 but cannot program esp8266

Accepted Answer

Description:
Full integration on one board: Mega R3 ATmega2560 and WiFi ESP8266 with memory 32Mb.
All of the modules can work together or each separately. And everyone has their own pinout headers.
The convenient solution for the development of new projects requiring Uno and WiFi.
Via USB you can update sketches and firmware for ATmega2560 and for ESP8266.
For this on board have the USB-serial converter CH340G.
Use this board is very simple.
The board has DIP-switch, to connect the modules.
For example, to: USB and ATmeg2560, USB and ESP8266, ATmega2560 and ESP8266.

Table DIP- switch:

Connection	DIP
 	1	2	3	4	5	6	7
ATmega2560ESP8266	ON	ON	OFF	OFF	OFF	OFF	OFF
USB ATmega2560	OFF	OFF	ON	ON	OFF	OFF	OFF
USBESP8266 (Update firmware or sketch)	OFF	OFF	OFF	OFF	ON	ON	ON
USBESP8266 (communication)	OFF	OFF	OFF	OFF	ON	ON	OFF
All independent	OFF	OFF	OFF	OFF	OFF	OFF	OFF 
Special Solution:
USB ATmega328 ESP8266
 	DIP	SWITH 2
Connection	1	2	3	4	5	6	7	 
USB  ATmega2560 ESP8266	ON	ON	ON	ON	OFF	OFF	OFF	To RXD3/TXD3USB converter CH340G connect to RX0/TX0 of ATmega2560
ESP8266 connect to RX3/TX3 of ATmega25

Question 2

Is it possible to purchase these boards without the headers soldered on?

Accepted Answer

all is the finished

Question 3

What type of external antenna connector is used on this board?

Accepted Answer

buy 2.4G wifi ipex antenna

Question 4

do you have to modify the board, i.e remove a resistor to get the external antenna to work? Because just connecting one doesn't make a difference.

Accepted Answer

You just have to connect the antenna. At best you get a 6 dB improvement, most of the time less. So it is difficult to see the difference.

ASIN	B07THDDFSJ
Brand	Songhe
Connectivity Technology	USB, Wi-Fi
Customer Reviews	4.2 4.2 out of 5 stars (84)
Manufacturer	Songhe
Memory Storage Capacity	32 MB
Mfr Part Number	E27
Model Name	Mega2560 + WiFi R3
Model Number	Mega2560 + WiFi R3
Operating System	Linux
Processor Brand	Espressif
Processor Count	4
RAM Memory Installed	32 MB
RAM Memory Technology	LPDDR2
UPC	778862585996
Wireless Compability	Bluetooth

Songhe WiFi R3 ESP8266 32Mb Memory USB-TTL CH340G

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