When I make my hardware projects at some point of development I usually need to know voltage of a pin, how many current is drained from the voltage source or a PIN and so on.
Voltage, current and often power that are involved into a circuit are magnitudes that an electronics designer must know during all time that they are active.
To measure them the simplest measurement instrument that you can use is the multimeter:
a basic and cheap multimeter measure voltage and current of a circuit and their values are display with numbers (often 3 digit) 3 times per seconds.
Another instruments that measure these magnitudes and offers some others interesting features is the oscilloscope: Continue reading