These are two types of measuring devices: the first one is an "all-purpose" component tester capable of detecting different components such as diodes, capacitors, transistors... and showing important values of it, such as which pin is what, the capacitance etc. It is programmed using an Arduino Nano.

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This one, although very complete, takes too long (couple seconds) to measure things and it is not very user friendly (have to push the measure button for each measure), so I did a "lighter" version which only measures capacitance, which many multimeters can't do and yet I often find myself wanting to for my SMD capacitors and to reverse engineer many electronic devices I find.

This second device also measures constantly, without needing to press any button. This way it is faster and leaves my hands free, which is crucial to measure tiny SMD components. The MCU is integrated on the PCB and is based on the ATmega328-au which is, after the ATtiny, one of the cheapest microcontrollers purchased in low batches.

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Click here for the schematic of the Capacitor Tester.

Credits for the code go to "Chauhan Vivek R" for the component tester (https://www.instructables.com/id/Arduino-Components-Tester/)

and "Maximous" for the Capacitance tutorial, edited by me to work on a generic LCD-display (https://www.instructables.com/id/Measure-Capacitance-with-Arduino/)