Ingineer wrote:I don't like the resistor to program method, instead here's my current favorite: Take a paperclip and insert it into the 2 small holes in the J1772 handle, then you use the button on the handle to cycle through the modes (the LED's will indicate which mode) then when you pull the paperclip, the mode is saved to EEPROM.
The industrious owners can then open their handle and install a momentary switch that does the same function without need of a paperclip.
This way it's software-only on my part.
While the J1772 is designed for complete safety, the paperclip in the pins method is best reserved for technically advanced users. Getting people used to sticking metal objects in electrical connections is.... And you don't want any mechanical damage to the J1772 connector in case people use two screwdrivers and wire or something else, though damage is fairly unlikely.
Can you do a "Enter current programming mode" in software by
1. Holding down the button for 10 seconds.
2. All the lights go blinky blinky for 2 seconds indicating you've entered programming mode.
3. Then the lights indicate current current level.
4. Any button presses less than 5 seconds from the last button press cycle through the current levels indicated by the lights.
6. No button presses in 5 seconds exits current programming mode and returns to operation at the programmed current level.
Or maybe do a hold for 5 seconds (or more), release, hold for 5 seconds (or more) again to enter programming mode to reduce any chance of inadvertent entry into program mode when using the button normally to unmate the connector.
What were you planning on doing to indicate the mode the EVSE is currently set to outside of programming mode, or do you have to enter programming mode to see it? Multicolor LED would be cool, but I imagine that gets into more hardware changes (Green 12A, orange 16A, Red 20A, or work a cool blue in there...)
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