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[03] Mini Control Board X3


This page contains information for controlling Mini Control Board X3 remotely from other devices.

Objective API (remote) for Mini Control Board X3 is in progress and will be added later.


A remote control board designed for small and compact robotic models. It includes battery, motor drivers, wireless connectivity and integration with Totem App. Can be used for controlling Totem products or creating personal projects. Totem App and provided API allows to customize actions board should perform.


  • Bluetooth connectivity
  • 4 DC motor channels
  • 2 servo motor channels
  • 12 red LED bar

Module image

Code examples

Arduino projects: X3_FBI_LedBlink.ino

TotemModule module(03);

Module commands

Before start

• Install programming environment by following tutorial on Arduino setup.
• Join our community forum for any questions:

Command naming convention

Some commands controls various channels (A, B, C, ...). There is a logic behind command naming for flexibility:
write("commandA", 10) - will set value 10 for individual channel A.
write("commandAll", 100) - will set value 100 for all existing channels.
write("commandABCD", 10, 20, 30, 40) - will set individual values for A, B, C, D channels.
write("commandABC", 10, 20, 30) - will set individual values for A, B, C channels.
Only commands listed in "Module commands" will be accepted. Other variations will be discarded.
All commands are case sensitive! Calls like CommandA, COMMANDa, motorA/BRAKE will be ignored.


Commands starting with "cfg" retains it's value after module power off. Used as module configuration parameters.

cfg/robot/name ( name )

Configure robot name visible during connection.
name - string (text) up to 30 bytes max.
Default: Totem X3-FBI.
module.write("cfg/robot/name", "My robot"); // Set robot name

cfg/robot/model ( model )

Configure Totem robot model (MiniTrooper, Truck, ...).
Used to identify type of the robot. Can be set to any value. Also received with getModel().
Value can be generated with command: TotemModule::hashModel("model").
model - 16bit hash of robot model name [0:0xFFFF].
Default: 0.
// Set robot model to Truck
module.write("cfg/robot/model", TotemModule::hashModel("Truck"));
// Check if robot is Truck
ModuleData data;
if (module.readWait("cfg/robot/model", data) &&
    data.getInt() == TotemModule::hashModel("Truck")) { }

cfg/robot/color ( color )

Configure robot color.
Used to recognize robot appearance by it's color. It may be displayed inside mobile application or on-board RGB LED.
color - 24bit RGB color value (without brightness) [0x000000:0xFFFFFF].
Default: 0.
module.write("cfg/robot/color", 0x0000FF); // Set robot color to BLUE
// Alternative to set individual RGB colors:
module.write("cfg/robot/color", 0, 0, 255); // Set robot color to BLUE

cfg/motorABCD/invert ( onA , onB , onC , onD )

Configure motor output polarity.
Individual motors can be configured to invert it's spinning direction. Allows to fix reversed motor wiring without reconfiguring robot controls.
onA - invert channel A [true:false].
onB - invert channel B [true:false].
onC - invert channel C [true:false].
onD - invert channel D [true:false].
Default: false (off)
// Invert channels A and B. C, B - not inverted.
module.write("cfg/motorABCD/invert", true, true, false, false);

cfg/reset ( )

Reset all module configuration to factory default.
module.write("cfg/reset"); // Reset all module settings to default

DC motor control

motorA ( power )

motorB ( power )

motorC ( power )

motorD ( power )

Set individual DC motor A, B, C, D channel power.
Positive - forward, negative - backward, 0 - stop.
power - channel output power [-100:100]%.
module.write("motorA", 100); // Write channel A

motorABCD ( powerA , powerB , powerC , powerD )

Set DC motor A, B, C, D channels power with a single command call.
Positive - forward, negative - backward, 0 - stop.
powerA - set channel A output power [-100:100]%.
powerB - set channel B output power [-100:100]%.
powerC - set channel C output power [-100:100]%.
powerD - set channel D output power [-100:100]%.
module.write("motorABCD", 100, 50, 0, -100); // Write channels A, B, C, D

Servo motor control

servoA ( position )

servoB ( position )

Set servo motor A, B channels position (-100, 0, 100) = (0°, 90°, 180°).
position - position of servo arm [-100:100].
module.write("servoA", 0); // Set servo channel A to 90° angle

Light bar control

leds ( state )

Control red LED bar.
Each bit in 12bit value represents individual on-board LED. 1 - on, 0 - off.
state - [0b000000000000:0b111111111111].
module.write("leds", 0b110011110011); // Set led bar to: on|on|off|off|on|on|on|on|off|off|on|on


battery ( )

Get connected battery voltage. This command is read-only.
Returned value is in millivolts. Divide by 1000 to get volts [2.7V:4.2V].
Returns: [2700:4200]mV.
// Read battery voltage
int voltage = module.readWait("battery").getInt(); // Result: 3350 → 3.350V
// 'readWait' will delay code execution until result is received from the module.
ModuleData data; // Prepare variable to store read result
module.readWait("battery", data); // Perform read with wait until result is received
bool voltage = data.getInt(); // Get battery value from result. 3350 → 3.350V
// Function that will receive all subscribed commands of module
void onModuleData(ModuleData data) {
    if ("battery")) { // Check if received command is "battery"
        bool voltage = data.getInt(); // Get battery value from result. 3350 → 3.350V
        Serial.print("Battery voltage = ");
void setup() {
    module.attachOnData(onModuleData); // Register onModuleData function
    module.subscribe("battery"); // Subscribe to receive any state change of battery

Low level commands

These are low level TotemBUS commands accepted by module. Is not required when using objective API described above.

Command Parameters Description
cfg/robot/name (string) Set robot name
cfg/robot/model (int) Set robot model hash
cfg/robot/color (int) Set robot appearance color
cfg/motorABCD/invert (bool, bool, bool, bool) Set DC A
cfg/motorABCD/autobrake (byte, byte, byte, byte) Set DC A
cfg/reset None Reset to default configuration
motorABCD (byte, byte, byte, byte) Set each DC channel spin direction and power
motorA (byte) Set DC A channel spin direction and power
motorB (byte) Set DC B channel spin direction and power
motorC (byte) Set DC C channel spin direction and power
motorD (byte) Set DC D channel spin direction and power
motorABCD/brake (byte, byte, byte, byte) Set each DC channel brake power
motorA/brake (byte) Set DC A channel brake power
motorB/brake (byte) Set DC B channel brake power
motorC/brake (byte) Set DC C channel brake power
motorD/brake (byte) Set DC D channel brake power
servoA (byte) Set servo A channel position
servoB (byte) Set servo B channel position
leds (int) 12-bit mask to set each LED on/off
battery Returns:(int) Get battery voltage

* brake feature is not supported in v.1.5 board revision.