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EVDrive
High-Precision, Ultra-Budget Science Olympiad EV Platform
Dual stepper motor drive with AS5600 magnetic encoders, reliable protected ESP32-S3 PCB, modular female header sockets, and open STEP CAD customization.
Technical specs
Drivetrain & Precision Motion
| Drive Configuration | 2x Independent Stepper Motors |
|---|---|
| Position Encoders | Dual AS5600 12-Bit Magnetic Encoders |
| Encoder Resolution | 4,096 positions per revolution |
| Stopping Response | Closed-loop micro-step braking |
Reliable Modular PCB
| Main Controller | ESP32-S3 Dual-Core SoC |
|---|---|
| Circuit Protection | Onboard Fuse & Reverse Polarity Diode |
| Component Sockets | Modular female headers (zero soldering) |
| Network Control | Dedicated hardware network on/off switch |
| Status Indicators | High-visibility Power & Status LEDs |
| Interconnects | Keyed, labeled motor & encoder ports |
| Future Expansion | Breakout GPIO headers for add-on sensors |
| Field Repairability | Plug-and-play module swaps in seconds |
Chassis & CAD Customization
| Expansion Mounts | Pre-drilled mounting grid for custom hardware |
|---|---|
| CAD Customization | Provided STEP file for Fusion 360 / SolidWorks / Onshape |
| Event Dowel Mount | 1/4" (6.35 mm) precision vertical clamp |
| Design Philosophy | Open geometry for team 3D printing & CNC mods |
Value & Regulations
| Cost Profile | Incredibly budget — much cheaper than other kits |
|---|---|
| Event Rules | Science Olympiad Division C compliant |
| Network Compliance | Hardware cutoff switch guarantees zero RF transmission |
| Power Input | Fused input for event-approved battery packs |
What's in the kit
One box, everything socketed and labeled — no soldering required to get moving.
Chassis & Drivetrain
- Lightweight rigid chassis plate with expansion mounting points
- 2x High-torque precision stepper motors
- 2x Competition drive wheels with low-friction bearings
- Provided 3D STEP CAD file for editing and custom modifications
- 1/4" wooden dowel competition mount clamp
- Complete M3 fastener kit and assembly wrenches
Reliable Modular Electronics
- RH Circuits EVDrive mainboard powered by ESP32-S3
- Built-in fuse and reverse polarity protection circuit
- Modular stepper driver carriers on female PCB socket headers
- 2x AS5600 high-precision magnetic rotary encoder modules
- Dedicated hardware network on/off switch for event impound compliance
- Multi-color Power and Status indication LEDs
- High-visibility, easy-to-identify motor and encoder wiring harnesses
- Exposed GPIO expansion header for custom team add-ons
Software, CAD & Support
- Pre-flashed competition firmware with precise calibration routines
- Open STEP CAD model file for 3D printing custom mounts
- Comprehensive digital assembly & tuning documentation
- Science Olympiad tournament day inspection checklist
Ready to build?
Full documentation covers assembly, calibration, firmware, and Division C rules compliance.