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Series 1: ESP32 Series Module Basic Learning Series Notes
1. Climbing the pit to learn a new journey, build an esp32 development environment on a virtual machine, and print "Hellow World". 2. Using the eclipes editor skillfully, the official tutorial builds an esp32 development environment under Windows and prints "Hellow World". 3. Know the GPIO interface of the basic esp32, start to light up your first LED and interrupt callback to realize the button function. 4. Experience the powerful timer function of esp32, realize timing 2s to flash an LED light. 5. Contact and practice the pwm width pulse function of esp32 to realize the breathing effect and flash an LED light. 6. The realization of smartConfig and WeChat airKiss in esp32, one-click network configuration and easy and quick connection to the router. 7. Use the GPIO interrupt to make a short press and long press callback event of a button, no longer need to worry about the trigger source. 8. Realize the role of local UDP client and server on esp32, and realize communication in LAN. 9. Realize the role of local TCP client and server on esp32, which can return data by disconnecting and reconnecting the original route. 10. Espressif esp32 SDK programming uses rmt to drive ws2812 colorful lights to achieve rainbow gradient effects. 11. Get started with the development of the Espressif esp-adf audio framework, build a Bluetooth headset with esp32, realize functions such as switching songs and obtaining song information. 12. Open source a WeChat public account airkiss distribution network esp32 and LAN discovery function project, and share an airkiss distribution network gadget. 13. esp32 has a built-in dns server, no need to access the domain name from the external network to return to the specified web page. 14. Esp32 sdk programming implements mandatory portal authentication. After connecting to esp32 hotspot, the specified login interface will pop up automatically.
15. Understand the local offline voice wake-up recognition framework esp-skainet to realize low-cost hardware voice local recognition control. 16. Learning the local voice wake-up offline recognition framework esp-skainet, how to modify the wake-up word? How to customize the command word? How to do intention action? 17. Launched on the whole network, Espressif esp32 sdk is directly connected to JD Weilian·Xiaojingyu·IoT open platform to realize intelligent voice control of Dingdong audio. 18. Get started with the H5 development of the control panel of Jingdong Weilian Xiaojingyu, understand the syntax of Vue, and make your own control page. 19. Heavy open source, how to connect esp32 and blufi with ble on the WeChat applet! 20. A good article, the esp32 firmware compiled during the development process is too large to start normally? Teach you how to customize the partition table partitions.csv. 21. The esp32 bluetooth distribution network blufi is highly packaged, easy to integrate, easy to use, easy to use, and improves development efficiency! 22. Discuss the programmer's "youth rice" and share the realization of multiple encryption algorithms md5 | AES CBC-ECB | Sha1 | Sha256 and so on in esp32! 23. Anxinke esp32-a1s audio development board transplanted the latest esp-adf audio framework, a small test how to realize online text-to-speech playback. 25. Share the package that realizes the smooth adjustment of the color temperature of cold and warm light in the esp32 SDK, and easily integrate it into your project. 26. Share how to use CMake to compile under the window, the compilation speed is improved by a level compared with traditional make compilation, and ESP32 and ESP32-C3 are supported. 27. Install the ESP8266/ESP32 environment with the built-in Linux under the windows10 platform, and there is no need to install an additional virtual machine.
Series 2: ESP32-Camera camera development board series notes
1. Anxinke ESP32-Cam camera development board secondary development C SDK programming, realize MQTT remote photo transmission to the private server. 2. Anxinke ESP32-Cam camera development board secondary development C SDK programming to realize local video stream monitoring. 3. Anxinke ESP32-Cam camera development board secondary development C SDK programming, the pictures taken are transmitted to the host computer PC through the wired serial port.
Series 3: ESP32-C3 Module Series Notes
Series 4: ESP32-S2 /S3 Module Series Notes
1. Engineering description
Recently, I saw that Espressif’s original factory is working on a USB-OTG solution for the ESP32S3 development board. I happened to play with it and share it with my friends. This open source sample program supports the following functions:
- Support the Host host to access the Internet wirelessly through USB, that is, the wireless network card .
- Support the Host host to communicate and control the Anxinke ESP-12K module through USB.
- Support a variety of system and Wi-Fi control commands, using the FreeRTOS-Plus-CLI command line interface, it is easy to expand more commands.
- Support hot swap.
2. Hardware preparation
Pinouts are only required for ESP chips with USB-OTG peripherals. If your board doesn't have a USB connector that connects to the USB-OTG dedicated GPIO, you may need to make a DIY cable and connect D+ and D- to the pins listed below.
ESP BOARD USB CONNECTOR (type A)
--
| || VCC
[USBPHY_DM_NUM] ------> | || D-
[USBPHY_DP_NUM] ------> | || D+
| || GND
--
module | USB_DP | USB_DM |
---|---|---|
Anxinke ESP32-S2/S3 Series Modules | GPIO20 | GPIO19 |
- Anxinke ESP-12K-KIT development board.
3. Compile the code
- Confirm that the ESP-IDF environment is successfully built, use the
master
branch - Add ESP-IDF environment variables, the Linux method is as follows, for other platforms, please refer to Set up the environment variables
. $HOME/esp/esp-idf/export.sh
- Download the source code: https://github.com/xuhongv/StudyInEsp32/tree/master/23_usb_dongle_wifii
- Set the compile target to
esp32s2
oresp32s3
idf.py set-target esp32s2
- Compile, download, view output
idf.py build flash monitor
4. Instructions for use
-
After completing the above hardware preparations and successfully burning the firmware, connect the USB to the PC
-
A USB network card and a USB serial port will be added on the PC side
-
On the Linux side, you can use the following command to check the newly added USB device, and on the Windows side, you can check the USB device through the device manager
ls /dev/ttyACM*
ifconfig -a
-
Communicate with the ESP device through the USB serial port, the baud rate is 115200, use the help command to view all the currently supported commands
-
Control the ESP device for network distribution operation through instructions
Notice!
When the device has been connected to a router, but you need to switch the router again, you need to perform the following operations after executing the sta or smartconfig network configuration command
View the name of the USB network card
ifconfig
Uninstall the USB NIC
ifconfig <name> down
Mount the USB NIC
ifconfig <name> up
command description
1. help
Function:
List all registered commands
Command:
help
Response:
help:
Lists all the registered commands
ap <ssid> [<password>]: configure ssid and password
sta -s <ssid> [-p <password>]: join specified soft-AP
sta -d: disconnect specified soft-AP
mode <mode>: <sta> station mode; <ap> ap mode
smartconfig [op]: op:1, start smartconfig; op:0, stop smartconfig
scan [<ssid>]: <ssid> SSID of AP want to be scanned
ram: Get the current size of free heap memory and minimum size of free heap memory
restart: Software reset of the chip
version: Get version of chip and SDK
>
2.ap
Function:
Set AP mode, query AP settings
Set Command:
ap Soft_AP espressif
Query Command:
ap
Response:
AP mode:Soft_AP,espressif
>
Note:
password is optional, if not configured, it will not be encrypted by default
3.sta
Function:
Start the Station mode and query the connected AP information
Set Command:
sta -s AP_Test -p espressif
Query Command:
sta
Response:
<ssid>,<channel>,<listen_interval>,<authmode>
>
authmode_value | mode |
---|---|
0 | WIFI_AUTH_OPEN |
1 | WIFI_AUTH_WEP |
2 | WIFI_AUTH_WPA_PSK |
3 | WIFI_AUTH_WPA2_PSK |
4 | WIFI_AUTH_WPA_WPA2_PSK |
5 | WIFI_AUTH_WPA2_ENTERPRISE |
6 | WIFI_AUTH_WPA3_PSK |
7 | WIFI_AUTH_WPA2_WPA3_PSK |
8 | WIFI_AUTH_WAPI_PSK |
Note:
password is optional
Function:
Disconnect from AP
Set Command:
sta -d
Response:
OK
>
4.mode
Function:
Set WiFi mode
Command:
-
Set Station mode
mode sta
-
Set AP mode
mode ap
5.smartconfig
Function:
-
Open SmartConfig network configuration
Command:
smartconfig 1
Response:
>SSID:FAST_XLZ,PASSWORD:12345678 OK >
-
Close SmartConfig distribution network
Command:
smartconfig 0
Response:
OK >
Note:
After using the
smartconfig 1
command to open the SmartConfig distribution network and successfully connect, there is no need to use thesmartconfig 0
command to close the SmartConfig distribution networksmartconfig 0
The command only needs to be called when SmartConfig fails to configure the network
Network distribution steps:
- Download ESPTOUCH APP: Android source code iOS source code
- Make sure your phone is connected to the target AP (2.4GHz)
- Open ESPTOUCH APP, enter password and confirm
- PC side sends
smartconfig 1
command
6.scan
Function:
Scan AP and list corresponding SSID and RSSI
Command:
-
Scan specific AP
scan <SSID>
-
Scan all APs
scan
Response:
>
[ssid][rssi=-22]
7.ram
Function:
Get the current remaining memory size and the minimum hourly memory size during system operation
Command:
ram
Response:
free heap size: 132612, min heap size: 116788
>
8.restart
Function:
restart the system
Command:
restart
9.version
Function:
Get the current IDF version and chip information
Command:
version
Response:
IDF Version:v4.4-dev-2571-gb1c3ee71c5
Chip info:
cores:1
feature:/802.11bgn/External-Flash:2 MB
revision number:0
>
In addition, don't take my blog as a learning standard, mine are just notes, and it's hard to be negligent. If there are any, please point them out, and welcome to leave a message!
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