ESP8266 Community Forum

- Mon Apr 11, 2016 8:52 am #45284 Hey all (first post in forum, yeah),
i recently bought several 8266-01 and now want to integrate one of them in my project. To start this, I wanted to sent a "AT" via the Arduino serial monitor. However i don't see the command in the window, nor do i get an answer. I do get alot of black diamonds with question marks in them. Sometimes with some numbers or letters.
Used Parts:
- USB to TTL (PL2303HX) Cable --> swapped RX and TX to test
- Arduino IDE -> tested all baud rates
- ESP8266-01 (fresh from their package)
- MacOS X 10.11
Wiring:
- GND to Ground (external power source)
- VCC and CH_PD to 3.3V (From a LD1117)
- GPIO0 to ground or unwired (tested both)

As I'm very new to this IoT and electronics in general, please tell me if i forgot any essential information.
Thank you for any advice,
cheers Ben

- Mon Apr 11, 2016 1:04 pm #45304 My guess... For some reason, some clever dude at ESP decided that ALL AT commands must be terminated with a CR LF
So if you just send a CR ie. AT \r you are ignored, AT \r\n gives back an OK
Tx Ben

- Mon Apr 11, 2016 3:23 pm #45312 Add 'lf' after the 'cr' ie. AT cr lf
Tx Ben

- Tue Apr 12, 2016 4:17 am #45337 Hey Bensi, thank you for your reply.
Unfortunately it is still not working. From what i have read, the PL2303 can make problems in some cases with a MacOSX. But I tested several drivers. So im thinking now to get an ftdi cable, just to make sure that the connection device is not the problem. Or is their a way to test my USB to ttl cable if it is working correctly?
From my understanding, the other thing what could be "broken" are the ESPs themselves. But i have no clue how to test them right now. Do you have any advice here?
Thank you,
cheers Ben