Here is a simple, yet useful circuit of an Arduino 4-digit ... to the LED segments, because each pin of a microcontroller can source or sink near 40 mA of current only. When all (seven) segments of ...

But just when we were sure that there was nothing new to be done in the realm of 7 ... MM segments. The Arduino fetches the time from a DS1302 RTC module and splits the result up into four-digit ...