Mode No.

Function/Mode Name

Hardware Needed

Firmware Task

GUI / App Switch (VB.NET)

Physical/Firmware Switching Method

1

Oscilloscope (X-Y & Normal)

STM32F407, LM358, Probe, Divider, Zener

Sample ADC fast, send data stream to PC; X-Y show if 2 channels

“Oscilloscope” button/tab; X-Y, Y/T view

Panel button to set MCU mode (“OSCIL”)

2

DC Voltmeter / Ampere Meter

STM32F407, LM358, Divider, Probe, Zener

Sample ADC slowly, average values; Calculate voltage/current

“DC Voltage / Ampere” button/tab

Panel button to set MCU mode (“DCV/AMP”)

3

Impedance Meter

STM32F407, LM358, Known Resistor, Probe, Zener

Output test signal, read response, calculate Z=V/I

“Impedance Meter” button/tab

Panel button to set MCU mode (“IMPED”)

4

Ohm Meter (Resistance Checker)

STM32F407, LM358, Known Resistor, Probe, Zener

Output test current, measure drop, calculate R

“Ohm Meter” button/tab

Panel button to set MCU mode (“OHM”)