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Do you run anything on a RISC-V processor?
(supermeter.social)
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Probably not what you're asking for, but I have an impression, that your primary motivation is curiosity and just good feeling of using the open platform, so I figured I'll mention it.
I'm using ESP32-C3 boards with some sensors and ESPHome to monitor air quality in my house. The board is RISC-V based and can be bought for real cheap. (single digit $ price generally) ESPHome is quite easy to work with and (If you're realistic with your expectations around very low power device) also quite powerful.
Honestly the ESPHome itself is almost too good if you're really curious as it abstracts the differences between various boards quite well. You're just editing a yaml file to define your desired functionality.
Even if you're hesitant to do some soldering, you can get pretty far if you buy board and sensors with pre-soldered pins and some jumper wires.
That is very cool, I hadn't heard of that before. I have never done anything with a microcontroller, but I'm thinking about it for RISC-V. It sounds like that might be one of the better ways of getting a RISC-V device in practical use, until more software packages become available for a full Linux machine.