Assembling
"The whole is more than the sum of its parts." 🔩
Item list
Construction kit
Main Frame: Body/Neck/Head/Arm/Upper Leg (pre-assembled x4)/Lower Leg Piece (x4)
1
Assembly Components: Calibrator part
1
Servo: P1S servo with long cable x5/P1S servo with short cable x5
10
Electronics: BiBoard (ESP32)/Rechargeable Battery/USB Cable
1
Tools: Self-tapping screwdriver/M2*8 screws
1
After verifying all components listed above, please proceed for detailed assembly instructions. You will learn more about the robot's design and structure through the assembly process.
Watch the Bittle assembly animation ↗ for a quick overview, or follow this detailed hands-on tutorial ↗ to build Bittle from the construction kit.
Neck
Required parts:
Neck × 1
Servo arm × 1
M2x8 sharp-end self-tapping screws × 2
Put the servo arm in the neck part like the figure below. The teeth of the servo arm should face upward.
Screw two M2x8 self-tapping screws beside both sides of the servo arm. Don't over tighten the screws.
Your neck assembly should look like this:
Body
This part is now fully assembled in the package.
Includes：
Assembled neck × 1
Chasis × 1
Front and back plate × 2
Side shoulder × 2
Recognize the front and back side of the chassis. The location of the two large holes along the center track makes a difference. In our standard configuration, we define the holes to be shifted towards the tail. You can also find a small mark "A1" in the front of the chassis.
Push the back tip of the assembled neck into the slot of the chassis. Then press down the front hook until you hear a snap sound.
Insert the chassis into one of the side shoulders.
Insert the front or back plate into the side shoulder. There are three tenons on each side of the plate. Insert the two front tenons as one group for better alignment.
Insert both the front and back plates. Plug the other side shoulder to complete the body. Again pay attention to the alignment of the tenons of the front and back plates.
You body assembly should look like this:
Upper leg
This assembly is best demonstrated visually—check the instruction video at 3:23 ↗ for the proper technique. Use finesse, not force! For more tips on installing springs with different tools, check out this forum post ↗.
Lower leg
There are five servos with long cables and five servos with short cables. The lower legs all need servos with long cables.
Required parts:
P1S servo with long cable × 4
Lower leg piece × 4
M2x8 self-tapping screw × 8
Assemble the right leg. Insert the servo into the window and route the wire through the notch on the internal edge. Refer to the tutorial video for the correct wire folding direction. Secure the servo to the lower leg with two M2×8 screws.
The left and right legs are built as mirror images, but the front and back legs are identical. You'll assemble two mirrored pairs of legs — one pair for the front and one pair for the back.
One pair of legs should look like this:
Head
There are five servos with long cables and five servos with short cables. The head needs a servo with a short cable.
Put the servo in the chin as shown in the figure. Pay attention to the direction of the servo's wire. After that, install two M2x8 self-tapping screws.
Insert the skull into the chin so that it can rotate and bite on small gadgets. It is advisable to apply some lubricant to the contact points.
Your head assembly should look like the figure above.
Shoulder servo
There are five servos with long cables and five servos with short cables. The upper legs all need servos with short cables.
Put the head, body, servos, and lower legs like the figure below. Insert the short servo wires through the servo slots on the side shoulders. Pay attention to the direction of the servos carefully and place them in the correct configuration.
You also need to insert the wire of the head servo into the body.
After confirming all the components ' directions, put the short wire servos into the side shoulders. Pay attention to the directions of the shoulder servos’ output shaft. The long wires of the lower leg servos should be inserted into the opening between the shoulder servo and the shoulder window. Use two M2x8 self-tapping screws to fix each should servo.
Repeat the above assembly for the hip servos.
Please note the direction of the shoulder servo:
Connect wires
The connection between the joint servo and the pin is shown in the figure below：
Please ensure the black wire (or the darkest wire - ground wire) is closest to the board and all the servos are connected to the correct sockets on the circuit board in the proper orientation.
Battery
Insert the battery plug into the power socket under the body. Then place the battery in the direction shown in the figure below, aligning with the mounting holes:
The battery connects to the body chassis via a latched sliding slot. To detach it, push the battery horizontally along the slot's direction.
Note:
Attaching the battery and detaching the battery are reverse processes.
Please ensure that the battery's charging port aligns with the direction of the robot's head to better balance its body during movement.
Press and hold the battery button for more than 3 seconds. If the red indicator light is on, charge the battery until the green light turns solid before use. Once powered on, the yellow and blue LEDs on the BiBoard will light up simultaneously.
Robot arm
This robot arm is already fully assembled.
Use the neck part with a J-hook (shown below) for the robot arm assembly.
Install the servo with the neck structure in the servo slot with two M2*5 self-tapping screws.
Calibration required
After completing the assembly, you must calibrate the robot joints before use. Proper calibration ensures accurate movement and prevents damage to the servos.
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