A DIY Biped Robot With Arduino, 3D Printed, and Lego-compatible Parts
Introduction: A DIY Biped Robot With Arduino, 3D Printed, and Lego-compatible Parts
Introduction
Making Biped robots that can mimic human walking has always been the focus of scientists, makers, and inventors for many years. In fact, biped robots are mobile robots with articulated leg mechanisms that provide locomotion. To compare with wheeled robots, they can go upstairs and pass on obstacles, although, at a slower speed. Building humanoid biped robots have always been difficult due to the high number of joints and maintaining stability during walking. If you have no academic knowledge on forward, inverse kinematics, and control engineering, it is absolutely no problem. In this tutorial, we are going to make a fun and easy-to-build biped robot with Lego components, an Arduino board, and some off-the-shelf electrical components. The instructions are prepared in a way that you can build them at home.
Step 1: General View of Biped Robot
In this project, the biped robot uses an interesting mechanical mechanism that mimics human walking with only one DC gear motor. The result is quite interesting.
In this tutorial, we will make the structure of the body and the leg mechanisms of the biped robot using Lego Technic parts. Then, one DC gear motor will drive the leg mechanism through bevel and spur gear trains.
Step 2: Electrical Assembly
In the next step, we will add an Arduino Nano as the brain of the biped. Arduino Nano uses a small-size powerful microprocessor that makes it suitable for low-weight and small-size projects.
Various off-the-shelf motors, sensors, and shields can be easily connected to Arduino boards. This feature enables us to do a variety of tasks with the biped. 949
For instance, you can tell the biped to move back and forth and dance by programming the Arduino board.
Step 3: Materials
List of electronic parts
A) 1x TT Gear Motor
B) 1x 3D Printed Gear Motor Housing
C) 1x BreadBoard, Mini Size
D) 1x Arduino Nano
E) 1x Neo Pixel LED Ring
F) 1x Power Jack
G) 1x 3D Printed Lego-Compatible Coupling
H) 1x L298N Mini Motor Driver
I) 1x Pushbutton
J) 1x M3 x 30 Machine Screw
K) 2x M3 Machine Screw
L) Male to Male Jumper Wire
List of Lego Technic components
A) Frame, 5x7-module
B) Double bevel gear, 36-tooth
C) Bevel gear, 12-tooth
D) Beam, 9-module
E) Beam, 5-module
F) Beam, 3-module
G) Angular beam, 3x5 module
H) Bushing, 1-module
I) Axle, 8-module
J) Angular block 2, 180
K) Double cross block, 3-module
L) Beam with cross-hole, 2-module
M) Axle with stop, 4-module
N) Beam, 3-module
O) Axle, 2-module
P) Connector peg with friction/axle, 2-module
Q) Connector peg with the axle, 2-module
R) Tube, 2-module
S) Connector peg with bushing, 3-module
T) Connector peg with friction, 3-module
U) Connector peg with friction, 2-module
V) Axle connector with axle hole
W) Angular block 1, 0
Step 4: Assembly of Mechanical Parts
Let's start assembling the biped's body-structure and leg mechanisms. The leg mechanism consists of a parallelogram mechanism that is driven by a four-bar linkage mechanism. Prepare Lego Technic pieces according to material figure, and follow the step-by-step video tutorial below.
Step 5: 3D Printed Parts
Lego Technic components only match with LEGO gear motors. In order to transmit power from the shafts of the off-the-shelf gear motors to Lego gears or axles, we need to print a housing for the gear motor as well as a coupling. The housing will serve as an interface or an adaptor between the gear motor and the Lego Technic beams. The coupling connects the gear motor shaft to the Lego Technic axle. These 3D printed parts are called Lego compatible housing and shafts. We have also created front and back body covers for the robot. The back cover look likes the oxygen capsule and protects the electronic part. The front cover acts similarly to armor. Please download the 3D files and print the motor housing, Lego-compatible coupling, and front and back covers with your 3D printer or use the ones in a maker space nearby. 832