Super Low Electrical Energy Meter || DIY or Buy || Is measuring µA/nA possible the DIY way?

You can buy the Otii Arc here: https://www.qoitech.com/buy/
Thanks to QOITECH for sponsoring this video.
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In this episode of DIY or Buy we will be having a closer look at the Otii Arc product. It is a tool that can basically measure µA/nA and therefore calculate the used energy of a low power device. Since such a tool is super handy to have around, I will also try to create my own crude low energy meter in this video. Let's find out whether a Teensy microcontroller and an Op-Amp circuit is capable of measuring µA/nA! Let's get started!

Websites which were shown/used in the video:
https://hackaday.com/2017/12/22/coin-cells-the-mythical-milliamp-hour/
https://www.pjrc.com/store/teensy32.html
https://forum.pjrc.com/threads/25532-ADC-library-update-now-with-support-for-Teensy-3-1
https://github.com/GadgetReboot/Processing/tree/master/Simple_Scope
https://www.analog.com/media/en/technical-documentation/data-sheets/OP177.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7192.pdf
https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-11057-32-bit-Cortex-M3-Microcontroller-SAM3X-SAM3A_Datasheet.pdf

Music:
2011 Lookalike by Bartlebeats

0:00 Introduction (Why I need to measure µA/nA)
1:45 Presenting the Buy option (Otii Arc)
2:53 Intro
3:12 Testing the Otii Arc
7:01 Coming up with a DIY solution
8:44 Building the DIY circuit
11:12 Conclusion