Motorized Precision.
One Tap Away.
Build your own motorized measurement ruler. Control it from your phone or desktop over Bluetooth Low Energy. Accurate to ±0.5mm.
Built for the Workshop
Professional-grade features, open-source flexibility
Bluetooth Low Energy Control
Control from any Android or desktop device. Real-time position feedback over Bluetooth 5.3 with sub-second latency.
±0.5mm Precision
Hardware-timed stepper pulses via ESP32 RMT peripheral. No CPU jitter, no missed steps.
Bosch GLM Laser
Pairs with Bosch GLM laser meter. Measure a distance and auto-queue the movement to the ruler.
Auto-Calibrate
Inductive homing sensor. Powers on calibrated — zero human intervention required.
1000 mm/s
Configurable speed and acceleration curves. Trapezoidal motion profile for smooth operation.
Open Hardware
ESP32-S3 based. Build it yourself with off-the-shelf parts. Full schematics, wiring diagrams, and build guide included.
What You'll Need
Source these parts yourself — we provide the software and build guide.
SmartRuler Pro Software + Build Guide
Firmware, mobile & desktop app, wiring diagrams, step-by-step guide
HGR20 Linear Rail Kit
2x 2000mm rails + 4 bearing blocks
NEMA 23 Closed-Loop Stepper Kit
YS-series 2.00Nm + driver + PSU
ESP32-S3 WROOM Dev Kit + Extension Board
Dual-core, Bluetooth 5.3, 8MB flash + expansion adapter
Inductive Proximity Sensor
LJ12A3-4-Z/BX (homing sensor)
SSR-25 DA Relay
Solid state relay for motor power
Jumper Wires
Male-to-male breadboard wires
HTD 5M Open Timing Belt
5M pitch open belt for stepper-to-carriage drive
NEMA 23 Mounting Bracket
Aluminum stepper motor mount bracket
Electrical Enclosure Box
Waterproof distribution box to house electronics
Android Tablet or Desktop PC
Android device or PC/Mac with Bluetooth Low Energy
Bosch GLM 50-27 CG Laser Measure
Bluetooth connected laser meter for auto-measure
Ready to Build?
One-time purchase per device. Lifetime access.
- ESP32-S3 firmware binary
- Mobile & desktop application
- Step-by-step build guide
- Full wiring diagrams & schematics