Shulou(Shulou.com)06/01 Report--

In this issue, the editor will bring you about how to use ESP8266 to connect to the router. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article.

Before connecting, download the program to arduino. It is very simple to define the soft port. If you want to change the program in the middle, remove the connection between rx and tx, or the download may fail.

Const int tx = 1 Const int rx = 0 void setup () {pinMode (rx,INPUT_PULLUP); pinMode (tx,INPUT_PULLUP);} void loop () {}

The picture below is ESP8266, which is not as small as an one-dollar coin.

(0) and (0) are square solder joints, corresponding to the left picture look at each pin, after connecting the arduino as shown below, the connection is very simple. CH_PD port is recommended to connect a 10K resistor in series.

The physical picture is connected as follows:

After connecting, turn on the serial port monitor, and before checking, disconnect the VCC of ESP8266, and then connect, you can see the startup information of ESP8266:

Never mind that there is a string of garbled codes in front of you. As long as you see ready, it means that the startup is successful. It took me an hour to come up with this startup message, and I encountered some troubles. First of all, it was baud rate. Some on the Internet said it was 9600, and some said it was 115200. Later, I learned that the baud rate was different because of different versions. However, this is not important. As long as I tried it a few more times, I was sure to try it out. Later, the two baud rates did not come out. As a result, the lines of TX and RX were connected back. After getting it right, ready finally showed up.

No matter what happened before, the ESP8266 is finally connected, and the wifi signal sent by the module can be seen in the wifi connection window of the computer or mobile phone.

It is said that the generated naming rules are based on the last few digits of the MAC address, which is not in-depth, leaving a suspense.

ESP8266 is controlled by AT instruction. Many tutorials on the Internet are configured from USB serial port to TTL. I really don't want to buy that thing. Arduino can also be configured for online viewing, that is, using AT instruction. This AT instruction is similar to a cmd instruction. To put it bluntly, it is API. There are registers and microcontrollers inside the module, which can be said to be a microsystem. After issuing instructions, they are processed inside the module. There are many specific AT instructions on the Internet. I feel that there is no need to remember those instructions, just take a look at them when you use them. Specifically, you can use Baidu: ESP8266 AT instructions. I found a document to put on the cloud disk, and you can download it and watch http://pan.baidu.com/s/1qWwVpPq.

Let's start with a restart instruction to see if the module is working properly:

Note: be sure to send a carriage return, otherwise there will be no return result. Because of this enter, I worked on it for more than half an hour, and the line was reconnected twice, alas.

AT+RSTAT+RSTOK fL?1? @ H? "@ HJ" [Vendor:www.ai-thinker.com Version:0.9.2.4] ready

After issuing the instruction, you will get a response: "OK", then ESP8266 starts to restart, and then you see ready, which means everything is fine. Let's start the configuration.

According to the information collected on the Internet, there are three working modes of ESP8266:

1.Station (client mode)

2.AP (access Point Mode)

3.Station+AP (two modes coexist)

Let's check the current mode first.

AT+CWMODE?+CWMODE:2OK

Mode return is 2, indicating that it is AP mode. Just now we saw that the computer has detected the signal sent by ESP8266, which can be accessed by the client. What I need to do now is to connect the module to the router at home so that the phone can send messages to the module, so I need to change the mode to 1.

AT+CWMODE=1OK

Send completed, and then look at the computer wifi connection window, just now the hot spot has disappeared, indicating that the mode has been converted to the client mode, to be on the safe side, or restart the module, do not do for a long time, the configuration did not take effect. After restarting, query the mode and return it to 1.

Ok, now you can let the module search the surrounding signals, use the following command to list the hot spots that can be connected (shown as garbled in Chinese)

AT+CWLAP+CWLAP: (4, "78:eb:14:f3:9c:1a", 1) + CWLAP: (4, "lion1201",-53, "20:dc:e6:d0:3b:3c", 1) + CWLAP: (4, "bing2014",-73, "ec:88:8f:63:40:d4", 1) + CWLAP: (4, "1",-82, "28:2c:b2:cf:7c:40", 1) + CWLAP: (0) TP-LINK_F7FF0E,-91, 0c:72:2c:f7:ff:0e, 1) + CWLAP: (4, "FAST_642712",-82, "20:dc:e6:64:27:12", 1) + CWLAP: (2, "Tenda_151F40",-73, "c8:3a:35:15:1f:40", 3) + CWLAP: (4, "FAST_B704",-90, "78:eb:14:86:b7:04", 1) + CWLAP: (4, "dashu",-80 "50:bd:5f:31:55:5a", 11) + CWLAP: (3, "YOUGUESS"-883125 ",-80," 7e:2f:68:6b:df:5e ", 11) + CWLAP: (4," 19890816 ",-63," d8:15:0d:48:b0:4a ", 11) + CWLAP: (4," YOUGUESS ",-66," 78:eb:14:ea:eb:10 ", 12) OK

Connect to my wifi, add the syntax is (AT+CWJAP=,), SSID is the name of wifi, so the Chinese is terrible, you can not enter.

AT+CWJAP= "lion1201", "1888888880" OK

Return "OK" for success and "FAIL" for failure

Let's see if the connection is connected, and query the AP of the current connection.

AT+CWJAP?+CWJAP: "lion1201" OK

That's right, connected, and check the IP address of the following module through the router:

AT+CIFSR192.168.1.104OK

As mentioned before, ESP8266 has registers, so even if you restart the connection information will not be lost, restart and then query, found that it will automatically connect. Use the computer ping about this ip,ip can be ping, indicating that the connection is normal.

C:\ Users\ Administrator > ping 192.168.1.104 Ping 192.168.1.104 has 32 bytes of data: reply from 192.168.1.104: byte = 32 time = 65ms TTL=255 reply from 192.168.1.104: byte = 32 time = 95ms TTL=255 reply from 192.168.1.104: byte = 32 time = 102ms TTL=255 reply from 192.168.1.104: byte = 32 time = 18ms TTL=255192.168.1 Ping statistics for .104: packet: sent = 4 Received = 4, lost = 0 (0% lost), estimated time of round trip (in milliseconds): shortest = 18ms, longest = 102ms, average = 70ms

Through the router management interface, you can see the MAC address of the module is: 18-FE-34-9C-8B-9D

Previously, through the computer to view the wifi hotspot window, ESP8266 released the hotspot name is ESP_9C8D9D, you can see that the name is the last 6 digits of the MAC address.

You can adjust the router's IP distribution policy to get a fixed ip for this mac address, so that you don't have to check the ip every time you connect to the router.

After configuration, it is prompted to restart the router to take effect. It doesn't matter if you have time to restart it later.

At this point, the ESP8266 connection to the wifi router is complete.

The above is the editor for you to share how to use ESP8266 to connect to the router, if you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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