The Pico, just like the Arduino boards, is a microcontroller, and a tiny one at that. In fact, it's only slightly larger than Arduino's smallest board, the Nano, at 51 mm x 21 mm. Both boards are ...

As you might expect, a common digital meter’s current scales aren’t usually up to measuring nano- or pico-amps. [Danny’s] approach was not to use the ammeter scale. Instead, he measures the ...