I wanted to stop bouncing between prototypes and instead keep building one thing over time — and recently I had the chance to dive into EV charging standards like OCPP and ISO 15118, so I started building an open-source EVSE firmware stack.

It runs on a resource-constrained MCU (currently using an ESP32-S3, but the architecture is portable), and it's written in C with minimal dependencies. The code is designed to isolate hardware-specific parts like CP signal handling, relay control, and metering — to allow reuse across hardware platforms and keep resource usage low.

It’s still very much a work in progress — but if you’re interested or have feedback on the structure or design decisions, I’d love to hear it.