Instructions

Expansion Kit

Open-Source Controller

The open-source controller combines a 2.4/5 GHz dual frequency Wi-Fi module, Bluetooth module,

and Arduino open-source platform. It is able to expand the features of pins such as UART, I2C,

GPIO, PWM, and SPI. Experience DIY ight by customizing accessories through programs such as

Arduino and MicroPython.

1. I/O Expansion Ports

Used to connect to the dot-matrix display & distance sensing module to add and expand

features. Supports UART, I2C, PWM, and SPI.

IO2 IO5 IO4 IO27 IO26 GND 3V3

IO12 IO21 IO15 IO14 IO13 GND 5V

The actual output voltage of 5 V is 4.8 V±0.2 V and of 3 V is 3.3 V±0.1 V. The maximum output

current is 800 mA. Each I/O expansion port can be mapped in the program and connected to

the user’s expansion module. For example, the UART pin can be connected to a module that

identies QR codes so that the RoboMaster TT can be programmed to identify QR codes.

2. Micro USB Cable

Used to connect the open-source controller to a 5V/2A USB power source or the Micro USB port

of the aircraft for power supply.

When connected to the Micro USB port of the aircraft, the open-source controller can be used

as an expansion module. The Wi-Fi network will change to RMTT-XXXXXX when the open-source

controller connects to the aircraft.

3. Switch

Used to switch between direction connection mode and router mode. Direct connection mode

is where the aircraft is connected to a mobile device via Wi-Fi. Router mode is where the aircraft

connected to a router.

Direct Connection Mode: Connect the mobile device to the Wi-Fi network of the aircraft named

RMTT-XXXXXX.

Router Mode: Connect the aircraft to the router using the SDK. The app cannot be used to

connect to the aircraft in this mode.

Toggle the switch to restart the open-source controller in router mode.

Users can test programming easily by toggling the switch back and forth to reboot the open-source

controller. Note that the connection mode will depend on the nal position of the switch after toggling.

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