Meet the RPM Apprentice — a next-generation RPM analyzer designed by WMH Racing to bring professional-grade motor diagnostics to your workbench.
Engineered around the powerful ESP32-S3 and a full-color 2.4” touchscreen, this compact device measures, visualizes, and records brushless DC motor performance with speed and accuracy once reserved for lab equipment.
? Engineered for Real-World Testing
From bench dynos to ESC calibration, the RPM Apprentice turns raw motion into actionable data:
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High-Speed Measurement – Accurately captures up to 220,000 RPM from three independent Hall or sensor channels.
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Dynamic Graphing – Real-time RPM histogram and acceleration plots update every 50 ms, revealing trends instantly.
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Three-Target Timing – Measure acceleration times to custom RPM milestones for power and performance benchmarking.
? Wi-Fi Connected
Forget the cables — your RPM data goes wherever you do.
The RPM Apprentice hosts its own wireless access point and web dashboard, so you can:
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View live RPM and max RPM in any browser
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Download raw
.csvtest data instantly -
Review target times and performance history remotely
⚙️ Built by Racers for Racers
| Feature | Specification |
|---|---|
| Processor | ESP32-S3 dual-core 240 MHz |
| Display | 2.4″ TFT (320×240) with touch |
| Inputs | 3× sensor channels (up to 240 kRPM) |
| Update Rate | 50 ms (20 Hz) |
| Graph Window | Up to 12 seconds (240 samples) |
| Connectivity | Wi-Fi Access Point + Web UI |
| Data Export | .csv with RPM, ω, and α values |
| Supply | 5 V USB-C |
⚡ Precision Meets Simplicity
Compact, durable, and intuitive, the RPM Apprentice bridges the gap between lab instrumentation and garage innovation.
Whether you’re tuning RC motors, validating BLDC designs, or pushing your next race setup to its limit — the Apprentice gives you the data you need to go faster, smarter, and further.
What's included:
RPM Apprentice, Stand, 275mm sensor wire, 275mm sensor wire extension, 3ft USB C Cable(for device)
Needed to use:
USB A power source.
Check out their Initial video below, as well as their tips video. Additional videos located on their Youtube Channel.