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I've been sitting with this problem for a while now. I have a ESP8266 WiFi module and I connected it to my Arduino Uno powering it from the 3.3V supply. Initially I tested it with the serial monitor sending AT commands to it. This worked fine for about 1 and a half days. All of a sudden the AT+CWLAP command doesn't work and the ESP8266 chip gives and ERROR but it worked with every other command.

Then out of nowhere I can't send any commands from the serial monitor any more! I set the the baud rate to 115200 and I can receive data from the chip when I pull the reset wire and reconnect it but cannot send anything. Tried everything to fix the problem. I bought a new wifi chip, connected it to a external 3.3V supply and did a complete reinstall of the Arduino IDE.

This is for a my final project for university and I have no idea what else to do. Any answers will be appreciated. Thanks

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1  
Show your wiring? – Majenko Oct 10 at 19:16
2  
Have you changed the line ending menu selection in Serial Monitor? When I'm communicating directly with the ESP8266 AT firmware using Serial Monitor I need to set it to "Both NL & CR". – per1234 Oct 10 at 23:46
5  
Did you use any level-shifting hardware? If not, the output from the Arduino serial port may have damaged the ESP8266. That would be consistent with what you observed. – Nick Gammon♦ Oct 11 at 4:58
    
Have you tried unplugging the connections and remaking them, just in case something has worked loose. Its worth a try, but I suspect NickGammon is correct. :( – Matt Oct 11 at 12:16

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