Mini APM3.1 Flight Controller with Power Module for Multicopter FPV

  • Mini APM Version 3.1 (upgraded from APM2.6)

  • Compact size: 35×35×8 mm, weight only 19g

  • 8-channel PWM input & 8 motor outputs

  • 12-way auxiliary input/output ports

  • Voltage & current measurement (5V ADC)

  • Supports GPS, Compass, Telemetry, and Power Module

  • JST-SH onboard connections (1.0mm pitch)

  • Fully compatible with APM firmware & ground station

  • No onboard compass – ideal for multicopters and rovers

  • Max current sensing: 60A, regulator outputs: 5.3V / 3A max

  • Power connector: XT60

Description

Mini APM3.1 Flight Controller with Power Module – Complete Guide

The Mini APM3.1 Flight Controller with Power Module is a compact yet powerful solution designed for drone enthusiasts, FPV racers, and professional multicopter builders. An upgrade from the APM2.6 board, this miniaturized version packs the same high-quality sensors, compatibility, and performance features into a 35×35 mm form factor. Whether you are building a small drone or a professional aerial platform, the Mini APM3.1 ensures stability, flexibility, and precise control.

In this comprehensive guide, we’ll explore every aspect of the Mini APM3.1 Flight Controller with Power Module, including features, specifications, connectivity, applications, benefits, and setup tips.


What is the Mini APM3.1 Flight Controller with Power Module?

The Mini APM3.1 Flight Controller with Power Module is a compact flight control system designed for multicopters, rovers, and FPV drones. Despite its small size, it integrates the same functionalities as the larger APM2.6 board.

It is Ardupilot-compatible, meaning it works seamlessly with Arducopter and Arduplane firmware, giving you access to mission planning, autonomous navigation, and advanced flight modes.

Key points:

  • Size: 35 × 35 × 8 mm
  • Weight: 19g
  • Fully compatible with APM Mission Planner
  • Designed for multicopters and rovers

Evolution from APM2.6 to Mini APM3.1

The Legacy of APM2.6

The APM2.6 was one of the most popular flight controllers for drone builders. It introduced flexibility, modularity, and support for autonomous missions. However, its size limited its use in compact FPV drones.

Why Miniaturization Was Needed

Modern FPV drones and racing quads demand smaller, lighter electronics without sacrificing performance. The Mini APM3.1 Flight Controller with Power Module was developed to meet this need.

What’s New in APM3.1?

  • More compact design (35mm board)
  • Same functionality as APM2.6
  • JST-SH connectors for neat wiring
  • External compass support for improved accuracy

Key Features of Mini APM3.1 Flight Controller with Power Module

The Mini APM3.1 Flight Controller with Power Module comes with robust features for stable and customizable drone operation.

Compact Yet Powerful

  • Size: 35 × 35 × 8 mm
  • Weight: only 19g
  • Perfect for small FPV builds

Connectivity Options

  • 8-channel PWM input
  • 8 motor outputs
  • 12 auxiliary input/output ports
  • Supports GPS, compass, telemetry, and OSD

 Power Management

  • Comes with a power module
  • Voltage and current sensing up to 60A
  • XT60 power connector
  • Stable 5.3V / 3A regulator

 Software Compatibility

  • Works with Ardupilot firmware (Arduplane/Arducopter)
  • Fully compatible with APM Mission Planner
  • Supports firmware upgrades via USB

Why Choose the Mini APM3.1 Flight Controller with Power Module?

Space and Weight Savings

At just 19g, this flight controller saves space and reduces overall drone weight – crucial for FPV racers and compact quadcopters.

Full-Size Performance in a Mini Package

Despite its size, the Mini APM3.1 Flight Controller with Power Module provides all the connectivity and functions of the full-size Ardupilot Mega board.

Easy Integration

The breakout cables and JST-SH connectors make it easy to connect GPS, telemetry, and OSD modules without clutter.


Technical Specifications

 Hardware Overview

  • Version: APM3.1 (upgrade of APM2.6)
  • Dimensions: 35 × 35 × 8 mm
  • Weight: 19g
  • Voltage Input: 18–28V
  • Max Current Sensing: 60A

 Ports & Outputs

  • 8 PWM inputs
  • 8 motor outputs
  • 12 auxiliary I/O ports

Power Module

  • XT60 input connector
  • Provides stable 5.3V @ 3A
  • Monitors current and voltage

Applications of Mini APM3.1 Flight Controller with Power Module

The Mini APM3.1 Flight Controller with Power Module is highly versatile and can be used across a variety of drone platforms and ground vehicles. Its compact size, lightweight design, and full Ardupilot compatibility make it ideal for both hobbyists and professional UAV applications.


FPV Racing Drones

The Mini APM3.1 Flight Controller with Power Module is perfect for FPV racing drones due to its compact size (35×35 mm) and low weight (19g), which are critical for maximizing speed and maneuverability.

Why it works well for FPV racing:

  • Precise control for aggressive maneuvers and flips
  • Stable flight even at high speeds thanks to accurate sensors
  • Supports telemetry for real-time data monitoring during races
  • Compatible with multiple FPV accessories like OSD, GPS, and external compasses

With the Mini APM3.1 Flight Controller with Power Module, pilots can achieve faster reaction times and smoother control, giving them a competitive edge in FPV racing events.


Aerial Photography Drones

For aerial photography and videography, the Mini APM3.1 Flight Controller with Power Module enables autonomous mission planning and GPS-based position hold, ensuring smooth and stable footage.

Applications include:

  • Pre-programmed waypoint flights for mapping or survey photography
  • Hovering at fixed positions for steady video shots
  • Integration with gimbals and cameras for professional-quality aerial cinematography
  • Telemetry support to monitor battery and flight status during long missions

This makes it an excellent choice for photographers, surveyors, and filmmakers looking for reliable, autonomous flight capabilities.


Multicopters & Quadcopters

The Mini APM3.1 Flight Controller with Power Module excels in multicopter and quadcopter builds, offering precise flight stabilization, GPS hold, and mission planning capabilities.

Key features for multicopters:

  • Controls 8 motor outputs for octocopters and quadcopters
  • 12 auxiliary inputs/outputs for additional accessories
  • Supports Arducopter firmware for advanced flight modes like Loiter, AltHold, and Auto
  • Compatible with GPS and external compass modules for enhanced navigation

Its versatility ensures that both hobbyists and professional UAV developers can achieve smooth and reliable flight performance.


Rovers & Ground Vehicles

Beyond aerial applications, the Mini APM3.1 Flight Controller with Power Module can be used in autonomous ground vehicles or rovers.

Why it works for rovers:

  • Supports Ardurover firmware for waypoint navigation and autonomous movement
  • External compass ensures accurate heading control
  • Monitors battery and current for long-duration missions
  • Compatible with telemetry for real-time monitoring and remote control

This functionality makes the Mini APM3.1 ideal for research projects, agricultural robots, and experimental rover platforms, providing the same reliability and stability as in aerial applications.


 

Compatibility with Accessories for Mini APM3.1 Flight Controller with Power Module

One of the major strengths of the Mini APM3.1 Flight Controller with Power Module is its flexibility and wide compatibility with essential drone accessories. By supporting GPS, compass, telemetry, OSD, and dedicated power modules, it gives drone pilots the freedom to expand functionality and improve flight experience.


GPS and Compass

The Mini APM3.1 Flight Controller with Power Module fully supports external GPS and compass modules, which are essential for autonomous missions and advanced flight modes.

  • GPS Navigation – Enables precise position hold, waypoint navigation, and Return-to-Home (RTH).
  • External Compass – Since the Mini APM3.1 lacks a built-in compass, using an external unit ensures accurate heading and prevents drift.
  • Installation Tip – Place the GPS + compass module away from motors and ESCs to avoid magnetic interference.

👉 This combination makes the Mini APM3.1 Flight Controller with Power Module suitable for both professional aerial mapping and hobby flying.


 Telemetry Systems

Telemetry modules greatly enhance the functionality of the Mini APM3.1 Flight Controller with Power Module by allowing ground-to-air communication.

  • Supported Modules – Works with both 433 MHz (for regions like Asia and Europe) and 915 MHz (for North America) telemetry kits.
  • Benefits – View live flight data such as battery status, GPS coordinates, and altitude directly on Mission Planner or mobile GCS apps.
  • Mission Uploads – Pilots can upload autonomous waypoint missions without needing a direct USB connection.

👉 With telemetry, the Mini APM3.1 Flight Controller with Power Module becomes a versatile choice for long-range FPV pilots.


 OSD (On-Screen Display)

The Mini APM3.1 Flight Controller with Power Module is compatible with OSD (On-Screen Display) modules such as MinimOSD. This integration allows pilots to see flight data overlayed on their FPV feed.

  • Real-Time Info – Displays battery voltage, current, GPS coordinates, altitude, and flight mode.
  • FPV Integration – Data appears directly on FPV goggles or monitors, eliminating the need to constantly check a ground station.
  • Safety Advantage – Monitoring battery levels in-flight prevents crashes due to sudden power loss.

👉 Pairing an OSD with the Mini APM3.1 Flight Controller with Power Module makes FPV flights more immersive and safe.


 Power Module

The power module included with the Mini APM3.1 Flight Controller with Power Module is one of its most important accessories.

  • Stable Voltage Regulation – Provides clean 5V power supply to the flight controller, ensuring consistent operation.
  • Battery Monitoring – Measures voltage and current draw, transmitting data to Mission Planner or OSD.
  • Plug-and-Play – Comes pre-configured with an XT60 connector for easy connection with LiPo batteries.
  • Protection – Prevents sudden brownouts or unexpected shutdowns during high current draw.

👉 This reliable power module ensures that the Mini APM3.1 Flight Controller with Power Module always receives stable power for critical flight operations.


 

Installation & Setup Guide for Mini APM3.1 Flight Controller with Power Module

Setting up the Mini APM3.1 Flight Controller with Power Module requires careful installation and configuration to ensure safe and stable flight. Below is a step-by-step guide covering everything from mounting to firmware setup.


Mounting the Board

Proper mounting of the Mini APM3.1 Flight Controller with Power Module is essential to minimize vibration interference and ensure accurate sensor readings.

Steps:

  1. Choose the Right Location – Mount the board at the center of gravity (CG) of your drone to achieve balanced performance.
  2. Orientation – Ensure the arrow on the controller points toward the front of the drone. Incorrect orientation will cause instability.
  3. Vibration Dampening – Use foam pads, rubber mounts, or vibration-dampening gel to isolate the controller from motor and propeller vibrations.
  4. Secure Mounting – Avoid using hard tape or glue directly, as it may transfer vibrations. Use zip ties or screws along with vibration pads.

👉 Proper mounting ensures stable flight and prevents drift caused by inaccurate accelerometer data.


Wiring the Power Module

The included power module provides stable power and tracks battery voltage/current for the Mini APM3.1 Flight Controller with Power Module.

Steps:

  1. Connect Battery via XT60 – Plug your LiPo battery into the power module’s XT60 connector.
  2. Connect to Flight Controller – Attach the 6-pin cable from the power module to the dedicated power input port on the Mini APM3.1.
  3. Check Voltage & Current – Confirm that Mission Planner displays correct voltage and current readings under the Flight Data → Status tab.
  4. Avoid Overloading – Do not power heavy accessories like FPV transmitters directly from the flight controller’s BEC. Use a separate BEC if needed.

👉 The power module not only powers the flight controller but also prevents sudden shutdowns by monitoring current draw.


Connecting GPS & Compass

Since the Mini APM3.1 Flight Controller with Power Module does not have an onboard compass, connecting an external GPS + compass module is critical for autonomous flight.

Steps:

  1. GPS Positioning – Mount the GPS module in a clear sky view, ideally elevated on a mast or away from interference sources.
  2. Compass Orientation – Connect the compass to the dedicated I²C port. In Mission Planner, select “External Compass.”
  3. Magnetic Interference Avoidance – Keep the GPS/compass module away from ESCs, PDBs, and power wires to avoid electromagnetic distortion.
  4. Calibration – Perform compass calibration outdoors in Mission Planner by rotating the drone in all directions until calibration is complete.

👉 A properly installed GPS and compass ensure precise navigation, accurate Return-to-Home (RTH), and stable position hold.


Telemetry Setup

Telemetry allows real-time communication between the Mini APM3.1 Flight Controller with Power Module and the ground station (laptop or mobile device).

Steps:

  1. Select Module – Use a 433 MHz or 915 MHz telemetry kit depending on your region’s regulations.
  2. Connection – Connect the telemetry module to the telemetry port on the Mini APM3.1 using the supplied cable.
  3. Ground Station Module – Plug the USB telemetry dongle into your computer running Mission Planner.
  4. Pairing – Ensure both air and ground modules are set to the same baud rate (57600 is common for APM).
  5. Testing – Open Mission Planner → Connect to see real-time flight data, battery voltage, and GPS status.

👉 Telemetry is essential for long-range flights, autonomous mission uploads, and in-flight monitoring.


 Software Configuration

Software setup is where you bring the Mini APM3.1 Flight Controller with Power Module to life.

Steps:

  1. Download Mission Planner – Get the latest version from the official Ardupilot website.
  2. Connect via USB – Plug the Mini APM3.1 into your computer using a micro-USB cable. Mission Planner will detect the COM port.
  3. Flash Firmware – Choose Arducopter (for multicopters) or Arduplane/Ardurover (depending on your vehicle) and flash it onto the controller.
  4. Sensor Calibration – Calibrate the accelerometer, compass, and gyroscope. Place the drone on a flat surface during accelerometer calibration.
  5. Radio Calibration – Move all transmitter sticks to their extremes while Mission Planner records the endpoints.
  6. Failsafe Setup – Configure voltage failsafe and throttle failsafe to ensure safe emergency landings.
  7. Flight Modes – Assign switches on your transmitter to flight modes such as Stabilize, Loiter, AltHold, and Auto.

👉 Once software configuration is complete, the Mini APM3.1 Flight Controller with Power Module is ready for its maiden flight.


 

Benefits of Using Mini APM3.1 Flight Controller with Power Module

The Mini APM3.1 Flight Controller with Power Module is not just a compact upgrade to the APM2.6 board — it delivers multiple advantages for drone pilots, whether they are hobbyists, FPV racers, or professional aerial surveyors. Here are the key benefits in detail:


Reliable Power Monitoring

One of the standout benefits of the Mini APM3.1 Flight Controller with Power Module is its built-in power monitoring capability. The included power module measures both voltage and current, allowing real-time battery status tracking in the APM Mission Planner or through an OSD (On-Screen Display).

Why this matters:

  • Prevents sudden in-flight shutdowns caused by depleted batteries.
  • Allows you to set failsafe triggers when voltage drops below safe limits.
  • Extends battery life by avoiding over-discharge.
  • Monitors power usage during long missions to calculate endurance.

With the XT60 connector and a stable 5.3V/3A output, the power module ensures that both the flight controller and connected accessories receive consistent power. This reduces risks of brownouts and provides peace of mind during critical flights.


Autonomous Missions

The Mini APM3.1 Flight Controller with Power Module unlocks the ability to fly fully autonomous missions using the APM Mission Planner. With GPS and telemetry integration, you can plan, upload, and execute missions without manual input.

Autonomous mission benefits:

  • Waypoint Navigation: Pre-define routes with multiple waypoints for surveying or mapping.
  • Return-to-Home (RTH): Automatic safe return if connection is lost.
  • Loiter and Circle Modes: Hover at a fixed point or circle around a location for aerial photography.
  • Follow-Me Mode: Track and follow a ground-based controller or GPS-equipped device.

For professionals, this means the Mini APM3.1 Flight Controller with Power Module can be used for aerial photography, agriculture monitoring, search and rescue, and mapping applications.


Open-Source Flexibility

Another major advantage of the Mini APM3.1 Flight Controller with Power Module is its support for open-source Ardupilot firmware. Unlike closed systems, Ardupilot is constantly updated and improved by a global community of developers.

Open-source flexibility offers:

  • Continuous feature updates and bug fixes.
  • Ability to switch between Arducopter, Arduplane, and Ardurover firmware.
  • Custom tuning of flight parameters to suit your drone.
  • Compatibility with a wide ecosystem of accessories (GPS, OSD, telemetry, gimbals).
  • Strong online community support for troubleshooting and upgrades.

This makes the Mini APM3.1 highly adaptable — whether you’re building a quadcopter, hexacopter, rover, or experimental UAV.


Cost-Effective Upgrade

Modern flight controllers like Pixhawk and Cube Orange are powerful but often expensive. The Mini APM3.1 Flight Controller with Power Module provides a budget-friendly alternative without compromising essential features.

Cost-effectiveness highlights:

  • Delivers full Ardupilot functionality at a fraction of the cost.
  • Compact design reduces the need for additional mounting hardware.
  • Comes with essential accessories (protective case, power module, connecting cables).
  • Ideal for beginners who want to learn about autonomous drones without heavy investment.

For drone hobbyists, students, and DIY builders, the Mini APM3.1 Flight Controller with Power Module is a smart choice that balances performance and affordability.


 

Common Issues & Troubleshooting for Mini APM3.1 Flight Controller with Power Module

Even though the Mini APM3.1 Flight Controller with Power Module is reliable and widely used, some users may face issues during setup or flight. Below are the most common problems and their solutions.


GPS Not Detecting

One of the most frequent problems users encounter with the Mini APM3.1 Flight Controller with Power Module is GPS not being detected in the Mission Planner.

Possible Causes:

  • Incorrect wiring or loose connection of the GPS module
  • GPS mounted too close to power wires or ESCs, causing electromagnetic interference
  • Sky obstruction (flying indoors or under heavy tree cover)
  • Firmware misconfiguration in Mission Planner

Solutions:

  1. Check Connections – Ensure the GPS module is properly connected to the correct port using the breakout cable provided with the Mini APM3.1.
  2. Placement – Mount the GPS in an open area of the drone, preferably on a mast or raised platform, away from ESCs, VTX, or high-current wires.
  3. Firmware Setup – In Mission Planner, verify that GPS is enabled and configured under the Initial Setup → Mandatory Hardware → GPS tab.
  4. Cold Start – When using the GPS for the first time, allow it 3–5 minutes under clear skies to lock onto satellites.

👉 If GPS still fails, test the module with another flight controller to ensure the issue is not with the GPS hardware itself.


Compass Errors

Since the Mini APM3.1 Flight Controller with Power Module does not have an onboard compass, it relies on an external compass. Incorrect setup or magnetic interference may cause compass calibration errors.

Possible Causes:

  • No external compass connected
  • Compass placed too close to motors or ESCs
  • Wrong orientation settings in Mission Planner
  • Magnetic interference from carbon fiber frames or power lines

Solutions:

  1. External Compass Required – Always connect an external GPS + compass module (e.g., Ublox M8N with integrated compass).
  2. Mounting Position – Place the compass module far from power distribution boards and ESCs to reduce interference.
  3. Orientation Settings – In Mission Planner, go to Compass Setup and select the correct orientation (often “External Compass” with “Rotation None”).
  4. Calibration – Perform a full compass calibration outdoors by rotating the drone in all axes as instructed by Mission Planner.

👉 If errors persist, enable “Compass/Motor Calibration” in Mission Planner to compensate for magnetic interference caused by motors.


 Calibration Issues

Calibration is critical for stable flight. If your drone wobbles, drifts, or fails to take off properly, it may indicate incorrect calibration of sensors or radio.

Possible Causes:

  • Accelerometer not calibrated on a flat surface
  • Radio (transmitter/receiver) endpoints not correctly set
  • ESCs not calibrated to throttle range
  • Vibration interference affecting accelerometer readings

Solutions:

  1. Accelerometer Calibration – Place the drone on a level surface and run Calibrate Accelerometer in Mission Planner. Follow the prompts to position the drone in six orientations.
  2. Radio Calibration – In Mission Planner, go to Radio Calibration and move all sticks to their extremes to set the correct input ranges.
  3. ESC Calibration – Calibrate ESCs using the throttle calibration procedure so that all motors spin up evenly.
  4. Vibration Control – Mount the Mini APM3.1 Flight Controller with Power Module on vibration-dampening foam or pads to reduce sensor noise.

👉 Always recalibrate sensors after firmware updates or hardware changes.


Power Loss

Power issues can lead to sudden crashes or system resets. Since the Mini APM3.1 Flight Controller with Power Module includes a power module with current and voltage sensing, proper setup is vital.

Possible Causes:

  • Loose XT60 connector
  • Faulty power module or broken wires
  • Overloading the BEC beyond 3A limit
  • Using damaged LiPo batteries

Solutions:

  1. Check Connectors – Inspect the XT60 connector and solder joints for looseness or corrosion.
  2. Test Power Module – Use a multimeter to confirm stable 5.3V output from the power module.
  3. Avoid Overloading – Do not power too many accessories (e.g., FPV camera, VTX) directly from the flight controller’s BEC output. Use an additional BEC if needed.
  4. Battery Health – Check LiPo batteries for swelling or voltage imbalance before flight.

👉 Enabling failsafe settings in Mission Planner ensures the drone lands safely if power levels drop unexpectedly.


 

Package Contents

When you purchase the Mini APM3.1 Flight Controller with Power Module, you get:

  • 1 × Mini APM3.1 Flight Controller (with protective case)
  • 1 × Power Module
  • 6 × APM connecting cables

Why Buy from NDB&C by LOFTY AGROTECH?

At NDB&C by LOFTY AGROTECH, we provide only tested, high-quality drone components. The Mini APM3.1 Flight Controller with Power Module is backed by reliable support and fast delivery.


Final Thoughts

The Mini APM3.1 Flight Controller with Power Module is the perfect solution for drone enthusiasts looking for compact, lightweight, and feature-rich flight control. Whether you’re building an FPV quadcopter, aerial photography drone, or autonomous rover, this controller provides the performance and flexibility you need.

By combining advanced features, reliable sensors, and Ardupilot compatibility, the Mini APM3.1 Flight Controller with Power Module ensures precise control, safe power management, and endless customization possibilities.


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