Maker and former One Laptop computer Per Little one staffer C. Scott Ananian has designed a quality-of-life improve for the OpenEVSE electrical car charging station, providing a capacitive touchpad and radio-frequency identification (RFID) reader to assist maintain your charger safe but permit third occasion entry on-demand.
“This challenge replaces the unique entrance panel of the OpenEVSE open-hardware EVSE [Electric Vehicle Supply Equipment] charger with a brand new entrance panel with a capacitive-touch keypad and RFID reader,” Ananian explains of the challenge. “This permits fundamental entry management to your charger: you’ll be able to assign PINs and observe utilization by PIN, maintain your charger ‘largely locked’ however permit of us who contact you on PlugShare [an EVSE sharing service] to drop by and cost when you give them a pin, and so forth. For frequent customers you can provide out RFID playing cards as properly, and observe utilization by card ID.”
A wise front-panel improve for OpenEVSE chargers makes it simpler to securely share power on providers like PlugShare. (📷: C. Scott Ananian)
The OpenEVSE challenge goals to ship an open supply various to off-the-shelf electrical car charging stations, and is available in its default configuration with a design that slots into the Polycase ML-85 weatherproof enclosure. Ananian’s mod, although, replaces the printed entrance panel with a capacitive contact PCB, lit to be used at evening by way of “reverse-gullwing” LEDs on the again aspect.
“I’ve obtained three of them working at my home now,” Ananian says of the newest revision of the board, which swaps a black solder masks layer for white with a purpose to scale back warmth build-up within the solar. “Two for our private EVs (a [Tesla] Mannequin Y and a Fiat 500e) and yet another for public use. We can provide out PINs for the general public charger once we’re contacted by way of PlugShare, or for neighbors who want a spot to cost, which lets us observe utilization.”
Ananian has launched the challenge for others to construct, however does warn of some “bodges” in its design — and the potential to resolve them in a future third revision. “The CAP1214 chip I am utilizing for the capacitive keypad has solely 11 LED outputs, whereas there are twelve keys on the keypad,” he explains.
The PCB sits behind the clear entrance of a weatherproof housing, making certain it’s going to maintain working come rain or shine. (📷: C. Scott Ananian)
“I hacked round this in v1 and v2 by wiring the ‘again’ and ‘enter’ keys LEDs in parallel,” Ananian continues, “so each LEDs blinked once you pressed both of them. The second bodge is the extra regular ‘dumb mistake’ variety, the place I might managed to brief two traces within the PCB format in a method that the DRC [Design Rules Check] did not catch; therefore the ‘inexperienced’ (truly orange) wire working from U3 to the capacitive pad for key ‘3.’”
Extra particulars on the challenge are avalable on Ananian’s Hackaday.io web page, whereas design recordsdata are revealed to GitHub beneath the reciprocal Artistic Commons Attribution-ShareAlike 4.0 license.