RC Excavator: Proportional Control & Alternative PCB
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Alternative PCB: Upgraded drivers, 3-battery expansion & analog control
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Model information
- Source
- Printables
- Category
- RC & Robotics
- License
- Creative Commons — Attribution — Noncommercial — Share Alike
Optimized Control Concept for the RC Excavator: Dual-MCU Upgrade
Hello to all fans of this model! The original control system quickly reaches its limits when trying to drive so many motors simultaneously using a single ESP32. Since a 30-pin ESP32 Dev Board is strictly required for the Bluetooth connection to a gaming controller (other variants often do not work here), available pins become extremely scarce.
To solve this bottleneck, I have optimized the hardware architecture. You can find the corresponding firmware and the Gerber files for the custom PCB in my repository: github.com
Key Improvements:
Dual-MCU Architecture: I added an extra ESP32-S3 Super Mini directly onto the PCB via RX/TX (UART) communication. This coprocessor is solely dedicated to handling the motor signals.
More Speed: The standard H-bridges were swapped out for the red DRV8833 driver modules. These handle a higher voltage, allowing the model to run on three battery cells.
The Result: The mechanical motors remain completely unchanged, but the controls are now significantly more responsive, smoother, and the excavator operates much faster.
Required Components for this Mod:
1x ESP32-S3 Super Mini
4x DRV8833 Dual Motor Driver Modules (red version, 1A)
6x AA Leaf Spring Battery Contacts
1x XT30 Connector (optional for power supply)