Hi
I have this WiFi module Screenshot by Lightshot
and try to connect to Arduino Mega 2560, but when I send AT command in Serial monitore i get ? mark Screenshot by Lightshot
This is how i connect wifi module to arduino board:
EN and Vcc to 3.3V
GND to GND
TX to RX2
RX to TX2
State to pin4
Note: I've also tried more baud rates (9600, 19200, 38400, 57600, 115200) and it's always same either ?mark either or nothing.
Does anyone know where is the problem?