First step is to try to add a chademo port for fast DC-charging, since that is the easiest way to get fast DC-charging, and in Sweden chademo is still pretty available at charging points.
Later steps might add a tesla gen 2 charger and i2 lim for 22kw ac charging and CCS-charging.
So because this is (isnt it always
a budget project, i didn't quite want to put out the 700€ for the zombieverter vcu, im going to try to get a cheap stm32f105 standlone board to act as controller for the chademo can com and contactors.So the cpu board look like this, minimal components:
- cpu
I programed a wemos esp8266 web interface and got it to connect to cpu board and read parameters via the uart3.
I got a mcp2515 can interface module to act as can3 for the chademo port, and some can trancievers for the two other can-buses on the stm32
And I got a mosFET board to control the contactors:
- mosfet
I also have to figure out how to convince the car to have the HV contactors turn on for chargning, one way is to just have the ignition on, but hen you cant really leave the car.
Another way is to piggyback on the earthleads for the contactors out of the battery and just pull them low to force the battery on, question is how sad the car VCU gets from having the HV turned on without having done it by it self.
One thing i havent figure out is what the m24m2 eeprom on the zombierverter vcu board is used for, since the parameters seems to be saved in the STM flash memory, anyone know? Is it needed for the zombieverter software to work correctly?