The loop() function begins by obtaining the count of networks detected via wifi, then clears the display buffer in preparation for a new page. The setup() function places the wifi in station mode, then initializes the graphics.
WEB BASED WIFI SCANNER SOFTWARE
The software contains the two standard Arduino functions setup() and loop(). I obtained the graphic library here: u8g2. Again, these libraries must be downloaded and installed in the Arduino environment before compiling and downloaded the code to the Heltech WiFi Kit 32 board. Two includes are required WiFi.h for the wifi code, and U8g2lib.h for the graphics code. I'll be porting more of my Feather applications to this board. The included source code uses the hardware I2C for communication with the OLED. Most of the display samples I located for this board utilized a software implementation for I2C communication with the OLED.
My first project for this board was to port a wifi network scanner I had developed for previous projects (the source code for the port is included as an Arduino. The board features a micro usb port for programming and charging, a JST 1.25 mm 2 pin connector (note this connector is smaller than most JST connectors I've used) and charger for a lithium battery, wifi, bluetooth, and an on board 128 by 64 OLED display, all for around $17.00 USD. After having difficulties with the Adafruit Feather ESP32 and static discharge sensitivity, I needed to find a suitable alternative for my previous, current and future ESP32 based projects.Īfter testing a variety of ESP32 boards (none of which exhibited the static discharge sensitivity), I ultimately selected the "Heltech WiFi Kit 32" board (available on line).
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