It is considered bad practice to hard-code WiFi credentials into Arduino sketches.
Typical recommendations include the WiFiManager library for ESP8266, and SmartConfig for ESP32.
Both require the user to have a smartphone to send command to the ESP chip, which otherwise does not have any User Interface (UI).
My ESP32 board is the Heltec WiFi_Kit_32 that comes with a 0.96 inch OLED display and a little PRG button connected to pin #0.
Can I use these minimal UI to enter WiFi credentials without involving a smartphone?
Design with Minimal UI
I took inspiration from Prof Stephen Hawking's computer:
I've been playing with ESP8266 for one and a half years now.
Recently, I'm upgrading to its bigger brother, the ESP32.
I purchased two development boards, one of them is the Heltec WiFi_Kit_32 that comes with a 0.96 inch OLED display.
When 2018 arrives, what's a better way to say Happy New Year than on the ESP32?
Therefore, I crawled out of the bed at 4AM, turned on the computer, and started Arduino IDE.
Half an hour later, I tweeted this picture:
The code is simple yet effective.
It was modified from u8g2 library full_buffer/HelloWorld example, with the constructor line found on Robot Zero One.