🏎️ Heavy-Duty Drive: RP2040 & HC-06 UART LINK ACTIVE

A high-current power management system engineered for inductive load control of automotive wiper motors. This architecture utilizes the Raspberry Pi Pico's hardware PWM registers to achieve precise velocity control via a wireless 2.4GHz Bluetooth bridge.

Back-EMF Mitigation: Driving high-torque motors requires robust H-Bridge isolation. This project implements specific firmware-level "Dead-Time" insertion to prevent shoot-through currents during rapid polarity reversal.

Access Repository

Firmware, .aia Project & Schematics

System Architecture: The Data Pipeline

The control loop maintains high stability by decoupling wireless packet handling from the motor drive frequency:

Physical Layer: HC-06 module operates as a 3.3V TTL Serial bridge, handling the 2.4GHz RF stack independently.
Command Parsing: The RP2040 utilizes a non-blocking UART.read() buffer to parse ASCII-encoded directional headers without interrupting PWM cycles.
Power Modulation: Hardware PWM is configured at 20kHz to minimize audible switching noise and optimize the torque curve of the 12V DC brushed motors.

Technical Specifications

Component	Engineering Specification
Control Unit	RP2040 (Dual-core Cortex M0+)
Wireless Protocol	Bluetooth SPP (Serial Port Profile) @ 9600 bps
Switching Frequency	20kHz PWM (Optimized for Inductive Loads)
Input Voltage	12V DC (Automotive Grade)
Software Stack	MicroPython v1.20+ & MIT App Inventor API

Smart Stability Framework

The system is built with Smart Stability logic. It acts like a robot’s brain, ready to use sensors (like the MPU-6050) to automatically balance itself and stay level, even when driving over bumpy or uneven ground.

Asynchronous UI Interface

The custom Android application provides an asynchronous data stream, allowing users to tune PWM limits and directional bias in real-time to correct for motor-torque discrepancies.