Flight Controller & ESC

We’re taking on the ambitious challenge of designing our own drone Flight Controller (FC) and Electronic Speed Controller (ESC) completely from scratch, rather than relying on off-the-shelf modules. This required us to dive deep into PCB design and power electronics, especially for the ESC, where managing high current flow, thermal performance, and signal integrity are major engineering challenges. We are currently in the prototype stage, rigorously testing and refining our design to achieve optimal performance and reliability before moving toward a production-ready version.

Name

Rupesh Kharole

Email:

[email protected]

01. Сhallenge

We’re currently in the prototype stage of developing our own drone Flight Controller (FC) and Electronic Speed Controller (ESC) from the ground up. This process has involved several key challenges:

Component Selection: Choosing suitable microcontrollers, gate drivers, and MOSFETs that balance performance, cost, and availability.
Thermal Management: Handling high current loads and heat dissipation efficiently to ensure system reliability.
PCB Design: Designing multi-layer boards with proper copper thickness, trace width, and isolation to manage high power and signal integrity.
Firmware Integration: Developing and testing communication between the FC and ESC for stable control response.

02. Features & Spec

Parameter	Specification
Microcontroller	STM32F4 Series (32-bit ARM Cortex-M4, up to 168 MHz)
Gate Driver IC	DRV8833 (Dual H-Bridge Motor Driver, optimized for PWM control)
External Power Stage	High-current N-channel MOSFETs (low RDS(on) < 2 mΩ)
Supported Firmware	Compatible with BLHeli / BLHeli-S open-source ESC firmware
Input Voltage Range	2S – 6S Li-Po Battery (7.4 V – 25.2 V)
Continuous Current	55 A
Burst Current (10 sec)	100 A
PWM Input Frequency	1 kHz – 48 kHz
Communication Interface	Standard PWM, DShot, or Serial (UART)
Control Logic Voltage	3.3 V / 5 V compatible (from STM32 MCU)
Protection Features	Over-temperature, Over-current, and Under-voltage lockout
Cooling Option	Integrated copper plane & optional aluminum heatsink
PCB Size	Compact design (customizable based on motor rating)

03. Technical Readiness

Hardware Design

Firmware Development

Power Stage Validation

Telemetry & Communication

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