The smallest coins fall out of the bowl first, followed by the bigger coins; each coin drops into a separate bin after passing through an optical sensor to count the number of each on an Arduino.

The sensor uses capacitive sensing, with a plate below each coin slot acting as one electrode of a capacitor and a copper-clad board hidden in the upper plate acting as the second.

The Coin Arduino-BLE kit is designed to simply that by offering a pre-rolled solution, completely with open-source software that will go up on Github in December, which is when the boards should ship.

In what must be the antithesis of a piggy bank, maker Jonathan Whalen has used 3D printing and an Arduino to make a Super Mario question block that mimics the in-game item, as long as you provide ...

In Insert Coin, we look at an ... SparqEE CELLv1.0 is a compact certified cellular board that plugs directly into Arduino and the Raspberry Pi shields, letting you piggyback on networks all over ...