J1772 charging station tester - displays pilot frequency, duty cycle and ampacityDesigned by Geppetto Electronics in United States of America
NEW There is now a second variant of the EVSE Tester! This one trades out the LCD display for a USB-C connection to facilitate automated or remote testing. What is it? This is an EVSE (Electric Vehic…Read More…
There is now a second variant of the EVSE Tester! This one trades out the LCD display for a USB-C connection to facilitate automated or remote testing.
This is an EVSE (Electric Vehicle Servicing Equipment - fancy term for a charging station) tester. There are two versions of the tester. The first 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. The second version is a USB connected tester. Connect the USB-C connector to a computer and you will see a virtual serial port. Connect to this serial port at 9600 bps 8N1 and you'll see twice-per-second JSON formatted frames describing the condition of the pilot signal. Send the characters A, B, C, or D and the simulated vehicle will change to any of those states (unfortunately, the "missing diode" test can't be done with this version).
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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