I'm not new to circuit design, but I have limited experience with MCUs. And I'm overwhelmed by the wide variety of products available, so I'm hoping somebody can weigh in on this.
I'm intending to build a three-phase EV-charger with two plugs. I've been looking into AVR MCUs first and I briefly considered using a raspberry pi. Maybe someone can help. These are my requirements:
Communications: (low bandwidth) wifi - external IC? What do I need for good range? SPI for communication with HV-side ADC. The HV-side ADC measures voltages and is connected via digital isolatorADC: 6 differential inputs, 10 kSps per input (2x3 currents, currents are sensed using hall sensors and thus need no additional isolation). 2 single-ended inputs, 1 kSps per input (2x control pilot) 1 temp sensor (internal)Display: small colour touch LCD using lvgl - what capabilities are helpful? I see some MCUs with touch support. what does that mean? I initially planned to just use a monochrome LCD and a few buttons because I thought it might be easier to talk to, but LCD touch screens are cheap and nice to have. Would there be any significant advantage to the simpler option?additional GPIO: 8x I/O for breakers (via driver, of course), possible buttons, LEDs,Speed: Most demanding task is probably running the display. Also needs to process measurements ADC (max 60k multiplications per second).Software: Fully Open Source toolchain appreciated. I know that an open source compiler is no problem, what about vendor-specific libraries?Memory: Some ROM for storing settings so they won't be lost when power is lost I'm not sure about the footprint of lvgl, otherwise I don't expect much memory use.
Hi Malte E.
Are you still looking for help with this, or did Bill's response give you what you need?
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