ESP-01 Antenna / LED cap
thingiverse
A tiny cap safeguards the ESP-01's antenna and blocks harsh LED glare at night. This keeps LEDs from flashing wildly, waking devices from deep sleep repeatedly when numerous units are nearby. Note that board widths can fluctuate slightly, so this cap might not perfectly fit your ESP-01 initially. It's designed for 14.6mm wide boards with a snug, but not overly tight, fit.
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