Lesson 3. Wi-Fi. Scanner



  • This lesson focuses on the built-in Wi-Fi. We will learn how to search for available wireless networks and see signal strength.

    Step 1. Check out some of the functions to work with Wi-Fi ESP32 in list 1;

    List1. Functions for working with built-in buttons

    • Wi-Fi access.mode(WIFI_STA); Sets the operation mode of the wireless adapter in client mode
    • Wi-Fi access.disconnect(); Terminates the wireless connection
    • Wi-Fi access.scanNetworks(); Scans the list of available wireless networks and returns their number
    • Wi-Fi access.RSSI(i); Returns the signal level of the wireless network with the serial number i
    • Wi-Fi access.SSID(i); Returns the name of the wireless network with the serial number i

    Step 2. Create a new sketch in the Arduino IDE. Select New on the File menu, (Fig. 1);

    alt text
    Figure 1. Create a new sketch

    Step 3. Please note that for the built in wireless Wi-Fi module you have to connect the library "Wi-Fi.h". We will write the code (Fig. 2 - 2.4);

    alt text
    Figure 2. Sketch. Page 1

    alt text
    Figure 2.1. Sketch. Page 2

    alt text
    Figure 2.2. Sketch. Page 3

    alt text
    Figure 2.3. Sketch. Page 4

    alt text
    Figure 2.4. Sketch. Page 5

    Step 4. Click the Upload button (Fig. 3) in order to flash the device;

    alt text
    Figure 3. Download the firmware to the device

    Step 5. When the device firmware is completed, on the device screen will appear the name of our lesson and the signature button, clicking on which the device searches for networks (Fig. 4, 4.1).

    alt text
    Figure 4. Main menu

    alt text
    Figure 4.1. Available wireless networks



  • Hi Dimi,
    Can you make this one available for download too please?



  • @jimit hi! you can download https://yadi.sk/d/azY94lkf3RkRei



  • @dimi
    Hi, thanks Dimi.
    Downloaded... flashed to unit... works well !! Cheers.