Multi Module
A 2.4GHz transmitter module that enables RC transmitters to control many different receivers and models via multiple protocols.
What is Multi Module?
Multiprotocol TX Module is an open-source hardware and firmware project that creates a universal 2.4GHz transmitter module for RC (radio-controlled) models. It enables a single transmitter to control receivers from many different manufacturers by supporting multiple RF protocols, such as DSMX, FrSky, and FlySky. This solves the common problem where transmitters are locked to proprietary protocols, allowing hobbyists to fly various models without needing multiple transmitters.
RC hobbyists, drone builders, and model aircraft enthusiasts who own transmitters and want to control a wide range of receivers and models from different brands. It's particularly valuable for those with DIY or modding skills who are comfortable with hardware assembly and firmware flashing.
Developers choose this project because it offers an affordable, flexible, and open alternative to buying multiple proprietary transmitter modules. Its unique selling point is the ability to consolidate control of many protocols into one module, supported by an active community that continuously reverse-engineers and adds new protocols.
Overview
Multiprotocol TX Module (or MULTI-Module) is a 2.4GHz transmitter module which controls many different receivers and models.
Use Cases
Best For
- Controlling multiple brands of RC models with a single transmitter
- Adding telemetry support to older transmitters
- Building a custom transmitter module with specific protocol selections
- Modifying OrangeRx DSM2/X modules to support additional protocols
- DIY electronics projects involving RC transmitters and receivers
- Flying bind-and-fly models with non-native transmitters
Not Ideal For
- Commercial drone operators needing FCC-certified equipment with warranties
- Hobbyists who prefer plug-and-play modules without firmware compilation or hardware assembly
- Users requiring all protocols simultaneously on memory-constrained microcontrollers like ATmega328P
Pros & Cons
Pros
Supports protocols from Spektrum, FrSky, FlySky, and many others, enabling control of diverse RC models from a single module.
Fully supports telemetry for compatible protocols, sending data like battery voltage back to the transmitter, enhancing flight monitoring.
Can be built DIY from PCBs or purchased ready-made, with choices in microcontrollers (e.g., ATmega328P, STM32) and RF modules for customization.
Actively developed with community contributions on RCGroups, ensuring continuous updates and reverse-engineering of new protocols.
Cons
Requires understanding hardware assembly, firmware compilation, and protocol selection, with troubleshooting often relying on community forums.
ATmega328P has a 32KB flash limit forcing selective protocol compilation, and even STM32 cannot hold all protocols, as noted in the firmware choices.
Documentation is spread across multiple pages and external forums like RCGroups, making it difficult for users to find cohesive guidance.
Frequently Asked Questions
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