ESP8266 not responding to AT commands
Posted: Mon Mar 02, 2015 11:07 amI bought 2 ESP8266 (V9.2.4) modules. Made a breakout board on a standard veroboard. Took all precautions:
- Used LM1117-3.3VDC regulator with 5 VDC input from ATX power supply. Vcc = 3.28 V at ESP with respect to ESP ground.
- Connected Reset & CH_PD to Vcc through 10K ohms.
- Connected GPIO0 to Vcc through 6k8 ohms.
- Connected level shifter (4K7 / 2 x 4K7) at ESP Rx input.
I am using a PC with serial port (COM1) conencted to a RS232 to TTL converter (based on MAX232) and TeraTerm.
Connected ESP module Rx to TTL Rx (through level shifter)
Connected ESP Tx to TTL Tx.
Set baud rate to 9600.
Upon power on, I get the version message with version 9.2.4 and READY on next line. So ESP transmits properly. Blue LED flashes during transmission.
ESP does not respond to any AT commands. When I type AT , press ENTER & Cntrl j, I do not get any response. So also for any AT command. Blue LED does not flash at all. I have two modules, both have same problem. I tried many baudrates and CR/LF combinations, no results.
Also, can I know how the blue LED is connected on the ESP module? The schematic does not show the LED.
Can someone help please?
- Used LM1117-3.3VDC regulator with 5 VDC input from ATX power supply. Vcc = 3.28 V at ESP with respect to ESP ground.
- Connected Reset & CH_PD to Vcc through 10K ohms.
- Connected GPIO0 to Vcc through 6k8 ohms.
- Connected level shifter (4K7 / 2 x 4K7) at ESP Rx input.
I am using a PC with serial port (COM1) conencted to a RS232 to TTL converter (based on MAX232) and TeraTerm.
Connected ESP module Rx to TTL Rx (through level shifter)
Connected ESP Tx to TTL Tx.
Set baud rate to 9600.
Upon power on, I get the version message with version 9.2.4 and READY on next line. So ESP transmits properly. Blue LED flashes during transmission.
ESP does not respond to any AT commands. When I type AT , press ENTER & Cntrl j, I do not get any response. So also for any AT command. Blue LED does not flash at all. I have two modules, both have same problem. I tried many baudrates and CR/LF combinations, no results.
Also, can I know how the blue LED is connected on the ESP module? The schematic does not show the LED.
Can someone help please?