KiCad boards from 4 GitHub repositories tagged “tachometer”, the most starred first; open any of them in PCBKit.
dazchi/bx-tacho
Open DIY Beyblade X launcher RPM meter: ESP32-C3 with IR sensors and an OLED, Bluetooth (Battle Pass protocol), and a browser app for shot data and firmware updates. KiCad hardware, ESP-IDF firmware, 3D-printed case.
maheen-ahmed1/OptoTACH
Precision non-contact optical tachometer (0–9999 RPM/RPS) built entirely with discrete CMOS logic & 555 timers; no microcontroller, no firmware. Includes KiCad EDA, 3D model, Python simulation, and bench validation.
