DIY Humanoid Robot Frame Kit 17DOF Platform with MG996 Servo Motor

Specifications

• Degrees of Freedom (DOF): 17 (5 per leg, 3 per arm, 1 for head)
  
• Frame Material: Hard Aluminium Alloy (Black Anodized)
  
• Included Actuators: 17× MG995 Metal Gear Servos
  
• Servo Torque: 9.4 kg-cm (at 4.8V) / 13 kg-cm (at 6.0V)
  
• Servo Speed: 0.20 sec/60° (at 4.8V) / 0.16 sec/60° (at 6.0V)
  
• Operating Voltage (Servos): 4.8V – 7.2V DC
  
• Current Draw (per servo): 170mA (idle) / up to 1200mA (stall) [Estimated]
  
• Communication Interface: 3-Wire PWM (Standard JR/Futaba connector)
  
• Servo Horns: 17× Metal Servo Horns (Round)
  
• Hardware Included: Complete set of M3/M4 screws, nuts, and cup bearings

Minimum hardware

• Multi-Channel Servo Controller (e.g., PCA9685 or 32-channel driver): Required because standard development boards (like an Arduino Uno) do not have 17 hardware PWM pins to drive every joint simultaneously.
• High-Discharge Power Source (2S 7.4V LiPo or 15A+ Desktop Supply): Essential because 17 MG995 metal gear servos can easily draw over 15 Amps under heavy load. A standard battery holder will instantly brown out.
• Main Microcontroller (Arduino Mega, ESP32, or Raspberry Pi): To calculate the inverse kinematics and send positional data to the servo controller.

Safety Warnings

• Massive Current Draw: 17× MG995 servos can pull enormous current spikes (15A+). NEVER attempt to power the servos directly from your microcontroller's 5V pin; it will instantly destroy the board.
• Voltage Limits: Do not exceed 7.2V on the servo power rail. Standard 2S LiPo batteries (7.4V nominal, 8.4V fully charged) require a high-current step-down buck converter (UBEC) set to 6.0V for safe, long-term operation.
• Pinch Hazard: Metal brackets driven by high-torque servos can easily pinch fingers. Always calibrate servos to their 90-degree center point before attaching the metal horns to the brackets.

Accessories Included in the Box

• 17× MG995 High-Torque Metal Gear Servos
• 17× Metal Servo Horns
• 1× Complete set of black aluminium alloy structural brackets (U-brackets, L-brackets, foot plates)
• 1× Complete set of mounting hardware (screws, nuts, cup bearings)

GUIDE:

• Humanoid Robot Frame Kit 17DOF-Assembling Instructions Manual

Frequently Asked Questions

• Is this kit compatible with standard Arduino boards?
  Yes, but an Arduino Uno cannot drive 17 servos directly; you must use an external I2C servo driver like the PCA9685.
• Can I use a Raspberry Pi to control this robot?
  Absolutely, a Raspberry Pi is excellent for this as it can handle complex inverse kinematics calculations and send I2C commands to a servo driver.
• Do MG996R servos fit in these brackets instead of the included MG995?
  Yes, the MG995 and MG996R share the exact same standard physical dimensions (40.7 x 19.7 x 42.9mm).
• Can I add sensors like an ultrasonic or camera module to this frame?
  Yes, the top "head" U-bracket features standard M3 mounting holes perfectly spaced for HC-SR04 sensors or small camera mounts.
• What voltage is required to power the 17 servos?
  The MG995 servos operate best at 6.0V DC for optimal torque and speed without overheating.
  
• Can I power the robot directly from my microcontroller's 5V pin?
  No, absolutely not; drawing power for 17 high-torque servos through a microcontroller will instantly destroy the board.
  
• How much current does the fully assembled robot draw when walking? During complex movements like standing up or dynamic walking, the combined stall current of the servos can briefly spike over 15 Amps.
• How do I wire 17 servos to my controller?
  You will plug all 17 servo cables into a 16-channel PWM driver (you will need two drivers daisy-chained, or a 32-channel dedicated servo board).
  
• Do I need to extend the servo wires to reach the controller?
  The included MG995 servos feature standard 30cm cables, which are generally long enough to route to a central torso-mounted controller.
  
• Why do the servos have three wires?
  The brown wire is ground, the red wire is for high-current power (6.0V), and the orange wire receives the low-current PWM control signal.
• Why are my servos violently twitching when powered on?
  This is almost universally caused by a missing common ground connection between your servo power supply and your microcontroller.
  
• Why does the robot immediately collapse when trying to stand?
  Your power supply or battery is likely browning out under the massive current load; ensure you are using a high-discharge LiPo battery and a high-current UBEC.
  
• Why are the leg joints binding or struggling to move?
  Check that the M3 screws connecting the U-brackets are not overtightened; they must rely on the included cup bearings to pivot smoothly.