Radiomaster MT12 Surface Radio Controller User Manual

1. Introduction

The Radiomaster MT12 is an advanced open-source surface radio controller designed for RC cars, boats, crawlers, and other surface models. It is the first surface radio officially supported by EdgeTX, ExpressLRS, and the Multi-module project, offering extensive customizability and a versatile operating system. With 10 physical inputs and support for 16 or 32 channels, the MT12 provides precise control and adaptability for various RC applications.

Figure 1.1: The Radiomaster MT12 Surface Radio Controller, a versatile remote control unit.

2. Product Features

• Pioneering open-source surface radio controller.
• Official support for EdgeTX, ExpressLRS, and Multi-module project.
• 10 physical inputs with support for 16 or 32 channels.
• Highly configurable for a wide array of surface models.
• Customizable base switches or 4-way joystick included.
• Adjustable trigger position and spring for fine-tuning.
• Equipped with 4 precision bearings for smooth control.
• Non-contact Hall sensors for accurate inputs and precise centering.
• 5 programmable trim buttons for personalization.
• 4 proportion input channels for greater functionality.
• USB-C port with QC3.0 fast charging (up to 2.0A max).
• CNC lanyard loop and replaceable grip.
• Custom RGB lighting, configurable via LUA scripts.

3. Package Contents

Figure 3.1: Contents of the Radiomaster MT12 package, including the MT12 controller, a carrying case, USB-C charging cable, a quick start guide, various interchangeable modules (base switches, 4-way joystick), and a battery holder.

Upon opening the package, verify that all components are present:

• Radiomaster MT12 Surface Radio Controller
• ER3C-i 2.4GHz ELRS PWM Receiver (included with ExpressLRS version)
• Carrying Case
• USB-C Charging Cable
• Quick Start Guide
• Customizable Base Switches / 4-way Joystick
• Battery Holder (for 18650 cells, batteries not included)
• Lanyard

4. Setup

4.1 Battery Installation

The MT12 controller requires two 18650 Li-ion batteries (not included). Insert the batteries into the provided battery holder, ensuring correct polarity. Then, insert the battery holder into the battery compartment located at the base of the controller. Close the battery compartment cover securely.

The controller supports QC3.0 fast charging via the USB-C port. Connect the USB-C cable to the port on the controller and to a compatible USB power source (e.g., wall adapter, computer USB port).

Figure 4.1: Close-up view of the USB-C charging port and CNC lanyard loop on the Radiomaster MT12 controller.

4.2 Initial Power On and Binding

Press and hold the power button (located below the screen) to turn on the MT12. The screen will illuminate, displaying the EdgeTX operating system interface. For initial use, you will need to bind the controller to your receiver. Refer to the EdgeTX documentation or specific receiver manual for detailed binding procedures, as these can vary based on the receiver type (e.g., ExpressLRS).

Figure 4.2: Overview of the Radiomaster MT12 control layout, showing the screen, navigation buttons (SYS, MDL, PAGE, RTN, TELE), and the power button.

5. Operating Instructions

5.1 Basic Controls

• Steering Wheel: Controls the steering of your RC model. Features non-contact Hall sensors for precise input.
• Throttle Trigger: Controls the speed and direction (forward/reverse) of your RC model. The trigger is adjustable for position and spring tension.
• Navigation Buttons: Use SYS, MDL, PAGE, RTN, and TELE buttons to navigate through the EdgeTX menu system and access various settings.
• CNC Menu Wheel: Provides intuitive navigation and selection within the menu system.

Figure 5.1: Side view of the Radiomaster MT12, highlighting the adjustable throttle trigger.

Figure 5.2: Detailed view of the adjustable trigger mechanism and the internal non-contact Hall sensors for precise control.

5.2 Advanced Functions

• Trim Buttons: The MT12 features 5 programmable trim buttons. These can be assigned to fine-tune various aspects of your model's control, such as steering trim, throttle trim, or other auxiliary functions.
• Proportion Input Channels: Utilize the 4 proportion input channels for advanced control over specific model features, offering greater functionality and customization.
• Custom RGB Lighting: Personalize the controller's appearance with custom RGB lighting, configurable through LUA scripts within the EdgeTX system.

Figure 5.3: Illustration of the 5 trim buttons and 4 proportion input channels on the Radiomaster MT12, providing enhanced control options.

Figure 5.4: Examples of custom RGB lighting effects on the Radiomaster MT12, which can be configured via LUA scripts.

6. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the controller. Avoid using harsh chemicals or abrasive materials.
• Battery Care: Store the controller in a cool, dry place. If storing for extended periods, remove the batteries or ensure they are charged to a storage voltage (typically 3.8V per cell for Li-ion).
• Firmware Updates: Periodically check the official EdgeTX and Radiomaster websites for firmware updates. Keeping your controller's firmware up-to-date ensures optimal performance, new features, and bug fixes.
• Grip Replacement: The MT12 features a replaceable grip. If the grip becomes worn or damaged, it can be replaced.

7. Troubleshooting

• Controller Not Powering On:
  • Ensure batteries are correctly installed and fully charged.
  • Check battery polarity.
  • Verify the power button is pressed and held sufficiently.
• No Control Response from Model:
  • Confirm the controller is successfully bound to the receiver.
  • Check that the receiver is powered on and correctly connected to the model's ESC/servos.
  • Verify model settings in EdgeTX match the receiver and model configuration.
  • Ensure the receiver's antenna is properly positioned and not obstructed.
• Limited Range or Intermittent Signal:
  • Check for environmental interference (e.g., Wi-Fi, other 2.4GHz devices).
  • Ensure the controller's internal antenna is not obstructed.
  • Verify the receiver's antenna placement on the model.
  • Consider updating firmware on both controller and receiver.
• Display Issues or Software Glitches:
  • Restart the controller.
  • Perform a factory reset (refer to EdgeTX documentation for procedure).
  • Update to the latest EdgeTX firmware.

8. Specifications

8.1 Radiomaster MT12 Controller

8.2 ER3C-i 2.4GHz ELRS PWM Receiver (Included with ExpressLRS version)

9. Warranty and Support

For warranty information and technical support, please refer to the official Radiomaster website or contact your authorized dealer. Keep your proof of purchase for any warranty claims.

Manufacturer: RADIOMASTER

Recommended Age: 18 years and up