ESC Function & Protocols
The ESC converts DC battery power to three-phase AC for brushless motors, controlled by the flight controller. DShot (digital) is the modern protocol — no calibration, noise-immune, supports telemetry. DShot300 is standard; DShot600/1200 for high-performance. Legacy Oneshot/Multishot are obsolete for new builds.
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4-in-1 vs Individual ESCs
4-in-1 ESCs integrate four ESCs on one PCB (30.5x30.5mm stack) — lighter, cleaner wiring, standard for FPV. Individual ESCs are used for heavy-lift (80A+) where heat dissipation and serviceability matter. All-in-one FC+ESC stacks simplify wiring further.
Amp Rating & Voltage
Rate the ESC for maximum motor current plus 30% margin. 5" FPV: 45-55A; 7" long-range: 50-60A; heavy-lift: 80-120A per motor. Voltage must match battery: 4S, 5-6S, or 8-12S rated. Capacitors smooth voltage spikes — use low-ESR capacitors rated for the pack voltage.
BLHeli_32 vs AM32 Firmware
BLHeli_32 is closed-source but mature with broad manufacturer support. AM32 is open-source and supports more MCU types. Both offer configurable PWM frequency (24-96kHz), bidirectional DShot RPM telemetry, motor direction reversal, and startup power tuning.
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