Leaf

butterflyeffect

An art-installation project built around small ESP32-S3 "leaf" PCBs: each leaf carries a radar presence sensor and a TFT display that reacts with a glitch/text effect. Includes the PCB design (KiCad, three board revisions), two firmware variants, and a source poem ("poetry monitors butterfly.pdf") that the TFT glitch text is drawn from.

Status: messy / in-progress. This repo is committed close to how it sits on the author's disk — see "Known issues" below before relying on it as a clean starting point.

What's in here

• PCB/leaf/, PCB/leaf2/, PCB/leaf3/ — three KiCad project revisions for the same "leaf" board (ESP32-S6/S3 module, per esp32-s3-leaf.kicad_sch at the repo root). leaf3 is the newest revision judging by file timestamps; leaf/leaf2 look like earlier iterations kept for reference. Each folder also has a production/ subfolder with JLCPCB-ready gerbers, BOM and pick-and-place files, plus a *-backups/ folder full of auto-save zips from KiCad — safe to ignore/delete, not source files.
• esp32-s3/ — a fourth, separate KiCad PCB export (gerbers + production files only, no schematic source committed alongside it) — likely an older or alternate board revision. Not clearly connected to PCB/leaf* from the file layout alone.
• code/esp32-s3-radar-test/ — PlatformIO project reading an RD-03D mmWave presence/distance radar module over UART (RD03D.h/.cpp).
• code/esp32-s3-tft-display/ — PlatformIO project driving a TFT display (via TFT_eSPI) with a scrolling/glitching text effect — GLITCH_PERCENT, FRAME_DELAY_MS, and the displayed text are #defined at the top of leafs/src/main.cpp and code/esp32-s3-tft-display/src/main.cpp. Uses a RAM-framebuffer sprite for performance (see the comment block in main.cpp explaining why).
• leafs/ — a third, PlatformIO-structured copy of the TFT glitch firmware (include/User_Setup.h for TFT_eSPI pin config). Appears to be the "current" leaf firmware; unclear how it differs from code/esp32-s3-tft-display/ without a diff.
• 3dmodels/wings.scad — OpenSCAD source for a mechanical "wings" part.
• poetry monitors butterfly.pdf — the source text the glitch display renders excerpts of.

Hardware

• ESP32-S3 module (per esp32-s3-leaf.kicad_sch / the leaf PCB silkscreen)
• RD-03D mmWave radar module (UART, 256000 baud) for the radar-test firmware
• A TFT display wired for TFT_eSPI (pinout is in leafs/include/User_Setup.h — check it before wiring a display, it is not documented here separately)
• Custom "leaf" PCB (KiCad projects above) carrying the ESP32-S3 and supporting components

No end-to-end wiring diagram tying the radar + display + leaf PCB into one finished device exists in this repo — piece it together from the two firmware projects' pin #defines and the KiCad schematic.

Build & flash

Both firmware projects use PlatformIO:

cd code/esp32-s3-radar-test   # or code/esp32-s3-tft-display, or leafs/
pio run
pio run -t upload
pio device monitor

Known issues

• Three near-duplicate PCB revisions (PCB/leaf, PCB/leaf2, PCB/leaf3) and a fourth unrelated-looking one (esp32-s3/) are committed side by side with no changelog explaining what changed between them. Before fabricating, diff the schematics or ask the author which is current (leaf3 is the most recently modified).
• KiCad auto-save backup zips are committed (*-backups/*.zip, dozens of them, several MB each) — these bloat the repo and aren't needed to build the board; the checked-in .kicad_pcb/.kicad_sch files are the actual source of truth.
• Two copies of the TFT glitch firmware (code/esp32-s3-tft-display/ and leafs/) with no documented relationship between them.
• No top-level wiring diagram or bill of materials tying the radar sensor, display, and PCB together into one buildable device.