The EVSE tester now also includes peak-reading voltmeter functionality, which will display the maximal positive and negative pilot signal voltage as well as the duty cycle and J1772 ampacity.
This is an EVSE (Electric Vehicle Servicing Equipment - fancy term for a charging station) tester. It is a 2x16 LCD module "backpack." You simply connect the 2.1 mm barrel connector to a 7-12 volt center positive DC power source and connect two wires from the screw terminal to the ground and pilot terminals of an EVSE. The 4 position DIP switch allows you to select one of the four different states (A, B, C and D) and simulate a "missing" pilot diode. The display will show the state of the pilot square wave signal frequency and duty cycle, translating the duty cycle into a J1772 amp rating.
In developing the firmware for the J1772 Hydra and OpenEVSE II, having the ability to exercise the various EV states and display the state of the pilot has been invaluable.
So far as I know, it is completely unique in having the ability to display the frequency and duty cycle and J1772 amp rating.
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I design and build small, useful electronic things. I started in 2013 after leasing an electric car and deciding that I could build my own charging station. Since then, I've gone on to design lots of things to fill particular needs.
The name of my store is partly a nod to Arduino's Italian roots, since Arduino got me into microcontroller engineering, and that led to everything else. I also like the image of Geppetto, working away in his workshop making little things that come to life.