![case animatronics stepping sound case animatronics stepping sound](https://imag.malavida.com/mvimgbig/download-fs/case-animatronics-31157-4.jpg)
The PWM signal can represent either a position (as was used for this puppet) or a speed, such as for the forward motion of an RC-truck. Within the puppet, a demultiplexor splits the single stream into multiple individual PWM connections, with one connection to each servo. This multiplexed stream may be carried via an RF signal or via wires (bottom of Fig. 2). As high as 20 channels may be commonly multiplexed. The RC style controllers typically use 1-2 millisecond PWM signals (Fig. 2), with multiple axes multiplexed into a single TTL stream. The use of real-time puppets allows for much more life-like interaction with the actors as the puppeteers can improvise with the actors in the shoot.
![case animatronics stepping sound case animatronics stepping sound](https://i.imgur.com/OjVUax0.jpg)
The motions were controlled real-time via RC plane-type controllers in this case with a wired connection as the dolphin puppet (Fig. 1) was in salt water, which greatly attenuates RF signals. One puppeteer controlled the many actuators involved in the body and tail motions, while another focused on the face, mouth, eyes. Think of the dolphin robot used in several movies. A complex puppet typically has multiple puppeteers to handle different aspects of the puppet. Puppets are the term for characters that interact with guests or actors with the help of human intervention - the puppeteer.
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