It is popular to show a progress bar to the user while a lengthy operation is in progress. Formare OTA upgrade is one of the lengthy operations. It may take from 5 seconds up to one minute to complete. It can make the user bored and the user concludes that the device is stopped working and do a hard reset.
We are going to make a simple demo kit for our tutorials, this board let us do more practical examples. The board contains two tact switches, one DS18B20 temperature sensor, an OLED display, and 5 LEDs. We want to make the board with simple parts that everyone could access.