esp8266 AT brush firmware instructions and

AT command is an instruction to the communication connection between the terminal device is applied to the PC application. AT namely Attention. Each AT command line can contain only one AT command; ESP8266 also has a number of AT commands, can be tested

esp8266 module AT test

I usually bought for the new module to be tested to see if AT problem
or a long time without the use of wifi module ready to be tested to ensure that the module is no problem
if the module in question is carried out brush firmware

Wiring
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using the serial port tool (I used here is sscom) and set it to select baud rate and other serial port ( download link )

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esp modules have three modes are sta, AP and sta / AP

The sta mode module connected to the router corresponding to the client
AP mode corresponds to the router module able to transmit WiFi, (factory default module to AP mode)
sta / AP is above two modes are

AT command

( Reference Book instruction )

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Send AT + CWMODE = 1 command module configured sta mode (mode parameters corresponding 1,2,3 sta, AP and sta / AP).
Transmitting the current scan command AT + CWLAP nearby WiFi, the module will return a list of available AP.
Use AT + CWJAP = "WiFi Name", "WiFi password" to connect to the router specified,
for example, I was "lib-free-wlan01" WiFi in the library, the password is "zhku-lib", the actual connection instructions sent WiFi It is AT + CWJAP = "lib-free -wlan01", "zhku-lib".
Return "WIFI CONNECTED" explained the connection is successful, "WIFI GOT IP" represents the module assigned to the IP.
Finally, using WiFi AT + CWQAP disconnect the current connection.

ESP8266模块 5G频段的WiFi扫描不到所以电脑发散的热点需要改成2.5G频率的。

使用arduino进行

其实也就是将arduino当做一个串口接收工具使用
接线图
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传入代码

#include <softwareserial.h>
SoftwareSerial ESP8266(10, 11); // RX | TX
void setup() {
Serial.begin(9600);
ESP8266.begin(9600);
}
void loop()
{
    // Keep reading from ESP-01s and send to Arduino Serial Monitor
    if (ESP8266.available())
   {
     Serial.write(ESP8266.read());
    }
     // Keep reading from Arduino Serial Monitor and send to ESP-01s
    if (Serial.available())
    {
      ESP8266.write(Serial.read());
     }
}

刷固件

刷固件也是一种编写esp的方式
同样也是一种让esp恢复出厂设置的方式，如果esp在设置等方面出现问题，这是应该刷官方出厂的固件。

资料下载

AT固件库是从该芯片的官网上下载的AT固件，资源下载链接 http://seafile.niehen.cn/d/9f7e0fa76198410396ba/

打开AT固件库的文件可以看到有8M和32M两种，我们直接选用8M的即可。
烧写软件，用的是flash_download_tools_v3.6.5（在刚才的链接里也有）
打开该软件后出现这样的页面，直接选择第一项即可。
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连接esp。
可以使用usb转ttl。不过推荐使用esp烧写工具，方便简单，
此时IO0 要拉低下载位。其他引脚不变
烧写设置
在最上面一栏选择上面提到的 8M固件
下面速度 40MHZ 模式 DIO
flash size 8Mbit 后面选择DoNotChgBin

最后选择端口就可以点击START开始了。
烧写过程需要几分钟的时间

烧写完成会显示FINISH
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4. 测试
可以打开sscom软件，选择对应的端口。
输入AT，返回OK。即可说明固件刷写成功。
接下来就可以使用其他的AT指令来进行对esp的配置或其他操作。
AT+CWMODE=3 指令配置模块为sta/AP模式（参数1,2,3分别对应模式sta，AP和sta/AP）。
AT+RST 重新启动
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AT+UART_DEF=9600,8,1,0,0 （arduino的软串口连接ESP-01wifi模块不适合波特率为115200(出厂时默认设定的！)在AT模式下输入AT+UART_DEF=9600,8,1,0,0修改为9600。）
参考链接
 参考链接

参考代码链接

GitHub地址