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floorCAN wiki

Remote appliance control over a CAN bus — two ESP32 nodes, one twisted pair, buttons on one floor switching relays on another. Final-year E&TC project at Walchand Institute of Technology, Solapur (2026-27).

Start here

• Hardware-Setup — BOM, wiring, termination, the pin-map bug, scaling
• Windows-Setup — full walkthrough for Windows users (sim + firmware)
• Protocol — the frame format, why the target lives in the CAN ID
• Simulation-Notes — what the sim models, what it skips, how to drive it
• Troubleshooting — the "no comms" checklist, ordered by likelihood

Sixty-second version

cd sim && python3 can_sim.py --serve    # open http://localhost:8765

Click a button on the schematic. A real CAN frame gets arbitrated, travels the CAN_H/CAN_L pair, flips a relay on the other node, and ACKs back. The force collision and unplug node buttons demo arbitration and bus-off/recovery — the two things CAN does that a UART link cannot fake.

Project status

2-node bench prototype. Works. The honest gap list for a real building is on Hardware-Setup under "Scaling past the bench".