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Bots 4-in-1 ESC

Use this document to help setup and test your Bots 4-in-1 ESC.

Bots 4-in-1 ESC

Features & Specifications

High-Performance 4-in-1 NDAA-Compliant ESC for UAVs Designed for professional UAV and robotics applications, the BOTS UNLIMITED 4-in-1 ESC delivers reliable, high-current motor control in a compact, robust form factor. Built around an open-source AM32 firmware stack, this ESC supports up to 50A continuous and 75A burst per motor, with advanced telemetry and signal support over DroneCAN, DShot, PWM, and KISS protocols. Engineered for mission-critical environments, the ESC features NDAA-compliant components, an external 24 MHz crystal oscillator for precise CAN timing, and a dual-PCB architecture that isolates high-power switching from sensitive control logic. Integrated current sensors on each motor channel provide real-time telemetry for closed-loop control and system diagnostics.

Core Features

  • 4-in-1 ESC architecture — controls 4 BLDC motors simultaneously
  • Battery input range: 3S–6S (11.1V to 25.2V)
  • Current capacity:
    • 50A continuous per motor
    • 75A burst per motor
  • Firmware:
    • AM32 open-source firmware

Telemetry

  • 4x individual current sensors (one per motor) with current reporting for each
  • Voltage sensing for VBATT
  • 4x individual Temperature sensing per motor MCU
  • 4x individual RPM reporting per motor MCU

I/O Interfaces

  • DroneCAN (CAN Bus): Supports control, telemetry, and in-field configuration over CAN
    • Dual JST-GH connectors:
      • One for CAN input
      • One for CAN output — enables pass-through connection to additional CAN nodes
    • Built-in termination switch for optional 120Ω CAN bus termination
  • DShot (DShot300, DShot600), Bi-directional DShot
  • PWM input
  • KISS-style Serial Telemetry

Mechanical & Electrical Design

  • Mounting pattern:
    • Standard 30.5 mm x 30.5 mm (M3 holes)
  • Weight:
    • 18.5g

Programming/Debugging:

  • Second JST-GH connector supports firmware flashing and diagnostics

Compliance:

  • Fully NDAA-compliant
  • PWB/Bare board also NDAA compliant
  • COO: Indonesia

Let’s build boldly —
The Bots Unlimited Team