For this exercise, we used the equipment of the lab to observe the operation of the Hello Echo Light Button Board. This is a PCB based on the Attiny 45 microcontroller.
The software loaded on the PCB was a morse code program (Mba’eichapa Arapy or Hello World in Guarani). We performed two measurements:

Operating Voltage:

For this we used a multimeter. We could verify that the operating voltage is 5.1 Volts for a PCB board designed to operate on 5 Volts. This small variation is within a tolerable variation range.

Oscilloscope:

to interpret a data signal. Using the oscilloscope we could graphically and in real time, “see” the signal corresponding to the program loaded on the PCB. This is a digital square signal, and it represents the High and Low states used in the morse code program. We also checked the noise of operating voltage using the oscilloscope.