First my esp8266 is bought from digikey, and its model is WRL-13678 and manufacturer is SparkFun Electronics .
I connected the 3.3V, GND, RX and TX pin EN.
Now I met some problem. First, it is not working normally. I read the AT command by ARDUINO and can only get the reply command once. I used the USB_TTL converter CD340 to control the ESP8266, when the io0 and io2 is not connected. the computer can't recognize the connector. when the io0 and io are connected to gnd, the computer can connect to the converter but when send AT command to ESP8266, no response.
I know there many version of 8266, did anyone use the same 8266 as me? how to connect the esp8266 to the mcu and how to program it. Can anyone help me? Thanks.