user77781: Firstly I have connected the Arduino UNo to Esp8266-01 Module and uploaded the Simple Blink Sketch using Arduino Uno and It responded correctly as in the Blue Led Light on Esp8266-01 was blinking correctly. Now for AT Commands I uploaded Blank Sketch to Arduino Uno and then on serial monitor with baud rate as 115200 typed in AT but no output is seen on Serial Monitor , Please Help Why Esp8266-01 Module not responding to AT Commands

user4143: The "AT" commands are provided by a specific sketch (firmware). The chip can only hold one sketch at a time - that sketch currently is your "blink" sketch.
If you want to have AT commands then you have to put the correct AT command firmware on the chip, removing your Blink sketch in the process.

77781: <p>Firstly I have connected the Arduino UNo to Esp8266-01 Module and uploaded the Simple Blink Sketch using Arduino Uno and It responded correctly as in the Blue Led Light on Esp8266-01 was blinking correctly. Now for AT Commands I uploaded Blank Sketch to Arduino Uno and then on serial monitor with baud rate as 115200 typed in AT but no output is seen on Serial Monitor , Please Help Why Esp8266-01 Module not responding to AT Commands</p>
 4143: <p>The &quot;AT&quot; commands are provided by a specific sketch (firmware). The chip can only hold one sketch at a time - that sketch currently is your &quot;blink&quot; sketch.</p>
<p>If you want to have AT commands then you have to put the correct AT command firmware on the chip, removing your Blink sketch in the process.</p>
