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Tinker Kit Braccio

by Tinker Kit
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Download Braccio Quick Start Guide




Go to the Braccio LABS Page
You can find resources, tutorials, sample projects related to everyday life with your Braccio 


Braccio Forum






Unlock the unlimited possibilities of robotics with Braccio! You can assemble your Braccio in a multitude of ways. Here are some examples:






Because it is designed for versatility, the Braccio can also support various objects on the end of the arm.
For example, you can use Braccio:

  • with your camera to follow a subject,
  • by mounting your telephone or your tablet to follow you when you’re at a video conference,
  • with a solar panel to follow the sun.



The TinkerKit Braccio is sold as a kit and requires assembly before use.  A setup guide is  included in the box, or you can download it here.

After assembly, you can adjust the alignment of all the motors by running the sketch called “testBraccio90” in the Braccio examples.
The sketch will position the Braccio in the upright position shown below. If it isn’t in this position, you will need to realign the servos (see the setup guide for details on how to do this).






Servo Technical Specifications


SpringRC SR431 - Dual Output Servo


Control Signal

PWM Analog



@ 4.8V: 169.5 oz-in (12.2 kg-cm)

@ 6.0V: 201.4 oz-in (14.5 kg-cm)


2.19 oz (62.0 g)


1.65×0.81×1.56 in (42.0×20.5×39.5 mm)



@ 4.8V: 0.20 sec/60°

@ 6.0V: 0.18 sec/60°

Rotation Support

Dual Bearings

Gear Material


Rotation Range


Connector Type

J (aka Futaba)



SpringRC SR311 


Control Signal

PWM Analog



@ 4.8V: 43.13 oz-in (3.1 kg-cm)

@ 6.0V: 52.86 oz-in (3.8 kg-cm)


0.95 oz (27.0 g)


1.23×0.65×1.13 in (31.3×16.5×28.6 mm)



@ 4.8V: 0.14 sec/60°

@ 6.0V: 0.12 sec/60°

Rotation Support

Dual Bearings

Gear Material


Rotation Range


Connector Type

J (aka Futaba)




Braccio Shield



 The included Braccio shield allows you to hook up the servos directly to your Arduino board.




Operating Voltage 


Power Consumption


Max current


1.1A from M1 to M4 connectors

750mA from M5 and M6 connectors


It has 12 standard TinkerKit 3-pin connectors. 

The connectors labeled M1 through M6 are connected to the PWM capable outputs of the Arduino board.  The connectors labeled I0 through I5 are analog inputs.


Each of the motor connections have a protection fuse:

  • M1 through M4 are limited to 1.1A
  • M5 and M6 are limited to 750mA


The connectors are connected to the following pins on the shield:

Connector Name

Shield pin










Dual Bearings




A0 (aka pin 14)


A1 (15)


A2 (16)


A3 (17)


A4 (18)


A5 (19)




RX0, TX0



The 4-pin TWI connector allows your Arduino board to communicate with devices that support the TWI (Two Wire Interface) or I2C (Inter-Integrated Circuit) protocol through the Wire library in Arduino.  Ground and 5 volt connections are provided on the connector.


NOTE:  On the Arduino UNO, the I2C bus uses Analog Input 4 and 5 (A4 and A5), whereas on the Arduino Mega the I2C connection is on pins 20 and 21. Using the TWI connector on the UNO (and similar) will preclude the use of those analog inputs (A4 and A5).


The 4-pin SERIAL connector allows the board to communicate with other devices that support serial communication. Ground and 5 volt connections are provided on the connector for your convenience.


NOTE: If you’re sending or receiving data to and from the computer this serial connector is not available.


The shield contains three status LEDs

  • Green LED (LED ON) signals that the shield is on
  • Another green LED (LED OK) signals that the shield is correctly powered
  • A red LED (LED ERR) signals that the shield is not correctly powered


A standard 6 mm pushbutton allows you to reset the board, and there is a jack for the external 5V 5000 mA power supply.


Compatible Boards:

  • Uno
  • Uno SMD
  • Uno WiFi
  • Due
  • Mega 2560
  • Ethernet
  • Leonardo
  • Leonardo ETH
  • M0
  • M0 Pro
  • Yun*
  • Tian


Using the Arduino UNO WiFi, Leonardo Ethernet, Yún or Tian, you can control your Braccio through the network with your PC or your smartphone. See the link below for a demonstration.


*Note for the Arduino YÚN

to make it compatible with the shield, you must bridge the 5v pin to the Vin pin as shown below: 



To avoid an overheating of the Yun you need also to move the 5V pin outside the header as the picture below:





This Kit includes



  • Plastic Parts x 21
  • Screws x 63
  • Flat Washer x 16
  • Hexagon Nut x 7
  • Springs x 2
  • Servo Motors: 2 x SR 311, 4 x SR 431
  • Arduino compatible Shield x 1 
  • Power Supply 5V, 5A x 1
  • Phillips Screwdriver x 1
  • Double Hexagon Box Wrench x 1
  • Spiral Cable Protection Wrap x 1



Schematics & Reference Design



EAGLE files: (coming soon)
Schematic: Braccio-Shield-schematic.pdf (coming soon)



Physical Characteristics 



Fully assembled Braccio Kit: 


792 g

Maximum operating distance range

80 cm

Maximum Height 

52 cm

Base Width

14 cm

Gripper Width

90 mm

Cable length

40 cm

Load Capacity

Maximum weight at 32 cm operating distance: 150 g


Maximum weight at the minimal Braccio configuration: 400g


Braccio Shield: The maximum length and width of the Braccio Shield PCB are 2.7 and 2.1 inches respectively, with the power jack extending beyond the former dimension. Four screw holes allow the board to be attached to a surface or case. Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins.


It is recommended to power the board via the jack connection with a regulated 5 VDC @ 5000 mA power supply provided in the box.

There is an on-board voltage regulator for higher voltages that protect the Braccio shield.NOTE: The protection doesn’t work for the Arduino Yun if you put the bridge between Vin and 5V.

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