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Bechele hardware

Achtually in the project its not too much about creating hard ware. Also its not too much about electronics, that has not changed since the first project (bechele 1) because it consists of cheap ready made parts. At prices of about 4 euro for a PCA9685 PWM controller direct form china, self made simply does not make sense. However you need to know the used parts and how to wire up, therefore the description here:

The Hardware of the project consists of the following parts:

  • Raspberry Pi 3 Modell B or OrangePi PC
  • 16 channel PWM servo controller from Duinofun, DeekRobot or Adafruit based on chip PCA9685
    In the images furter down a build with an OrangePi PC is shown.
  • Analogue model building servos – for example  SG90 from TowerPro.
  • Two plug based power supplies 5V 1x for Rasperry Pi and 1x for the Servos (The partition of the power supplies prevents of electrical disturbance and is actually mandatory)
  • Joy stick (self made) with data processing via Arduino Micro Pro and transfer via serial interface to the Raspberry Pi.
  • The movement mechanics of Bechele 2. Because the face mechanics of bechele 2 is much more complex than the firs project, I was forced to use some machine made parts. The eyes again were made out of empty deo roller balls.
  • Amplifier and loud speaker that amplifies the audio data from the raspi
  • Outer skin of the movement model or puppet.

I recommend to use one of my 3D printable eye mechanics, since the tome to build them is much less than making your own hand made mechanics.

See terefore:

3D printable eye mechanics on

Short the functions of the puppet head:

  1. Movement of the eye lids left and right seperately (2 Servos)
  2. Mouth movement open and close (1 Servo)
  3. Eye movement left -right and up-down (2 Servos)
  4. Movement of the eye brows up and down (1 Servo)
  5. Movement of the eye focus (squint) (1 Servo)
  6. Movement of the mouth corners (1 Servo)

Here some impressions of the project:

CAD view from the rear
CAD view from the front
and bottom front
The PCA 9685 Board on the bottom
Wired to fit into a puppet head
CAD view
Front view
8 Servos in use
Orange Pi PC on top
Face mechanics electronic hardware

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