My Robot Store

My Robot Store
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Sunday, August 13, 2017

Review of the ROBOTIS-MINI ,UPDATED (08/27/2017)

I can’t say enough about this kit! No other humanoid robot can beat its price and performance! I have owned and used this robot for over 3 years now and everyone who sees it falls in love with it. This robot has won me many awards over that last 3 years at Maker Faires as best of show/faire (4 times) and at Robogames for events like robot freestyle (silver and bronze medal winner) and soccer (gold and silver medal winner). What everyone loves the most about this robot is its dance moves as it is a great dancer! It comes with everything you need to build it with including a screwdriver and to program it with. This is also a great kit to start with and as a learning tool before you move on to Robotis’ more advanced humanoid robots like the Bioloid Premium humanoid or ROBOTIS-OP 2. If you are new to robotics or humanoid robots this is a great kit to start with.

Interesting side note about the XL-320 servos used by this kit. They have very similar power and torque to the first Kondo servos used around 2001 to build the first humanoid hobby robots in Japan. But for a quarter of the price! 

XL-320 Specifications 

Weight16.7 g
Dimension24mm x 36mm x 27mm
Gear Ratio238 : 1
Operation Voltage (V)7.4
Stall Torque (N.m)0.39
No Load Speed (RPM)114
MotorCored Motor
Minimum Control AngleAbout 0.29° x 1,024
Operating RangeActuator Mode : 300° Wheel Mode : Endless turn
Operating Voltage6~8.4V (Recommended voltage : 7.4V)
Operating Temperature-5° ~ 70°
Command SignalDigital Packet
ProtocolHalf duplex Asynchronous Serial Communication (8bit,1stop,No Parity)
Link (physical)TTL Level Multi Drop (daisy chain type connector)
ID253 ID (0~252)
Baud Rate7843bps ~ 1Mbps
Feedback FunctionsPosition, Temperature, Load, Input Voltage, etc.
MaterialCase : Engineering Plastic Gear : Engineering Plastic
The servo control board for the robot is the OPENCM. Think of the OPENCM as Arduino  clone  with servo plug-ins for the XL-320 servo.

OPENCM specifications.

STM32F103CB (ARM Cortex-M3)
Operating Voltage
5V - 16V (USB 5V, DYNAMIXEL 7~12V)
Recommended Voltages 
  • 5V for USB,
  • 7.4V for DYNAMIXEL XL series
  • LB-040 3.7V x 2 
    (The OpenCM 485 Expansion Board is recommended to control DYNAMIXELs which require over 12V)
External I/O
Analog Inputs
10 (12 bit A/D Conversion)
Flash Memory
128 Kbytes
SRAM Memory
20 Kbytes
Clock Speed
USB port
1 (2.0 Full Speed)
Debug Ports
XL-Type TTL port (3 Pin)
4 (XL Type)
External Sensor port (5 Pins)
4 (Compatible with ROBOTIS Sensors)
27 mm X 66.5 mm
Extra tip: Build-a-Bear workshop clothes fit this robot if you want to add personality to your robot! See the video below for an example.

Below is my ROBOTIS-MINI un-boxing video.

Robotis-mini climbing stairs during Robogames 2017.

My interview of two high school students talking about programming the Robotis-mini at Robogames 2017.

Where you can buy it: Robotis World. , Robotis US. , Amazon Price is 499.99 US.

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