ESP8266 Community Forum

- Sat Jun 04, 2016 9:56 am #48564 Hi, newbie here currently i am trying my esp8266 with a usb to serial converter in order to test my ESP. i have already made the required hardware connection which are as follows
Vcc- 3.3V
gnd- gnd of usb to serial
ESP RX- usb to serial TX via a voltage divider
ESP TX- usb to serial RX directly
CH_PD, RESET and both GPIO to 3.3V
i am using coolterm and also tried other serial software too. while powering on ESP red led glows and blue led glows only once but it is not sending the ready signal. i am using the baud rate 115200 and carriage return only. Can anybody please help me to get out of this problem. Is there any further setting in coolterm or anything just wrong with hardware?? please help.

- Sun Jun 05, 2016 4:06 am #48609 Try different baud rates, different firmwares use different rates.

Almost all firmwares will send debug at bootup at 78400, you won't be able to send back, but you should at least be able to confirm reception (probably the blue flash you see when you turn it on).
Once you know you see stuff, start at 9600 baud and work up, (rebooting each time) until you see something intelligible.

If it is the AT firmware, it should respong OK to the command
AT
on its own.

- Sun Jun 05, 2016 6:52 am #48612 It is ESP01 and running on default firmware as i have just unpacked it. on searching online somewhere it is mentioned that for default firmware the baud rate is 115200 which should be used with carriage return only, in my case it didn't work. As per your advice i have tried other different baud rates but the situation is same i.e. no response from ESP. As mentioned blue led glows only once or twice on powering up. Is there any additional setting in serial software instead of carriage return while trying at different baud rates?? baud rate 78400, not available in serial software so how can i proceed with my ESP just to get ready signal please suggest.

- Sun Jun 05, 2016 7:57 am #48614 AT Firmware requires both CR+LF, so sending CR only won't respond anything.