welcome to DPV TEchnology.In this video we
will learn how to communicate with ESP8266 through AT command using Arduino IDE and we
will learn how to change name and password of esp8266 wifi with the help of at command.
so lets get started.you can buy all types of electronics components modules senors at
best price from www.dpvtechnology.com. To send At commands from Arduino IDE, Arduino
microcontroller should be in reset mode. because to send at command we only use the arduino
IDE software not the arduino microcontroller, so to set the microcontroller at reset mode,
we have to connect the reset pin of the Arduino to ground pin of the Arduino. here is our
connection diagram, we have to connect the rx pin of the esp to rx pin of the Arduino.
then Tx pin of the ESP to Tx pin of the Arduino. Then we have to connect the ground pin of
the ESP to Ground pin of the Arduino.Then we have to connect this CH_PD pin of the ESP
to 3.3V pin of the Arduino.Again we have to connect this VCC pin to 3.3V pin of Arduino.
In some cases, during transmission of data, the ESP8266 may require more current, so if
it requires more current, then we have to connect this vcc pin of the ESP8266 to external
3.3V power supply, not to this 3.3v power supply of the Arduino, because this 3.3V power
supply of the Arduino cannot provide sufficient current to this ESP8266. So we have to connect
this Vcc pin to 3.3V power supply that is externally which can provide sufficient amount
of current to this ESP8266 module. At last we have to connect this reset pin of the Arduino
to ground pin of the Arduino to keep this microcontroller as reset mode. so here is
our connection, thsi is the VCC pin that is connected to 3.3V pin of Arduino. Thsi is
RX pin, that is connected to RX pin of Arduino.This one is CH_PD pid that is connected to 3.3v
of Arduino. this one is TX pin that is connected to Tx pin of Arduino and this one is ground
pin that is connected toground pin of Arduino, here is the reset pin that is connected to
ground pin of Arduino. Now connect your Arduino board to your PC through your Arduino USB
cable. Now open your Arduino IDE software, then go to file, then go to new and click
on new. After that we have to uploadf this blank scetch. before uploading this balnk
scetch, we have to remove this tx and rx wirers from the Arduino and this reset wire. then
we have to upload this. after uploading this code, we have to again connect this, rx and
tx wires and also this reset pin. so here we can see it is uploaded, done uploading.
now we have to connect this wires again, so we have connected it. Now go to your Arduino
serial monitor here, no go to bottom right corner here and set the baud rate at 115200.
Now we will send AT commands to communicate with this module. SO type AT then press enter.
so here we can see the module response is OK, that means it is now in AT command mode.After
that we will send AT+RST, A T plus RST then press enter. So this will reset the wifi module.Next
we will send AT+GMR, so here we can see AT+GMR , it will show the version of the ESP module.Clear
output. Again I will type AT+GMR. Thsi will show te version of the ESP module.After that
we will send AT+CIFSR then press CIFSR then press enter, so this will show the IP address
of the EsP8266 module. We can set the esp module in two modes. Station mode and AP or
Access point mode.Station mode means ESP8266 will act as a client , it can request a URL
from server, if we set the esp8266 in AP or access point mode, then ESP8266 will act like
a wifi router where our phone or pc can be connected. By sending
AT command AT+CWMODE=1, we can set the esp8266 in client mode. TO set the esp8266 in wifi
router mode, we have to or access mode we have to send command CWMODE=2, so here we
can see it is now, it will now act as wifi router. So if we send command AT+CWMODE=3,
then, the ESP8266 will act as mode 1 as well as mode 2 that means it will act as client
as well as wifi router. Now we will check the SSID that is the name of the esp8266 and
the password by sending command AT+CWSAP then question mark, then press enter, so we can
see the default name is ESP and password is password for this esp8266, for my esp8266.
now I want to cahnge this ssid or name and this password. So to do that type command
AT+CWSAP=then double quotation then the name that we want to set , suppose I want to set
it as MY_ESP, MY_ESP and then double quotation close,then double quotation start then the
password, suppose I want to set the password as 12345678, so then this quatation then comma,
1,4 this one and for, after that press enter. So now I can see that response is OK, that
means my default name is now MY_ESP and password is 12345678, lets see AT+CWSAP then quetion
mark. So here we can see the name is MY_ESP and password is 12345678.Now it should be
noted that in most of the cases, this password must be equal or more than 8 character long,
otherwise you will get error. Now let us see whether that password will work or not. First
go to wifi, then I can see this is the name MY_ESP,then here password ,so password was
12345678, now join..so we can see it is connected here.you can buy all types of electronics
components modules senors at best price from www.dpvtechnology.com.So thank you for watching.
