Talking Yoda head

The talking Yoda head consists of a Yoda mask and a microcontroller system to achieve the desired operation/effect. The basic operation of the project was specified as follows: The head was to be placed inside a closed box. Upon opening the box, the light sensor sends a signal to the microcontroller which, in turn, activates the ISD1000A to play message number one. The audio output is fed back into an A/D converter and processed in the microcontroller to make the mouth mechanics move via servo control. When the box is closed again, message 2 is played. Upon reopening of the box, message 3 is played and then message 4 is continually played until the box is closed again. When the box is closed again, the system resets and prepares to play message 1 again when the box is reopened.
Talking Yoda head - schematic

This project was born from a bad incident involving e-mail and Yoda. It was created as a practical joke for a fellow co-worker moving on to other aspirations. Because of a short time frame and eagerness by those involved, this project was completed in an amazing six days. These plans are not to be copied or distributed, in whole or in part, without the express written consent of one of the project contributors. However, we give full permission to anyone that wishes to download and print out one, and only one, copy of these plans for personal use. No permissions are given, nor will be given, to anyone wishing to use these plans commercially. This project, nor the people involved, are in no way affiliated with Lucas Arts. This project was completely voluntary. The Analog-to-Digital converter used in this project is the TLC548. This is an 8-bit A/D converter which sends its data serially back to the microcontroller - one bit at a time. The retrieval of a data sample is quite easy and only requires 3 data lines - two for control and one for data input to the microcontroller. To retrieve a data sample, the CS line of the A/D converter must be set low (this starts the data retrieval). 1.4 uS after the CS line goes low, the Most Significant Bit (MSB) of the 8-bit sample will appear on the data output pin of the A/D converter. To get the next 7 data bits, the CLK pin of the A/D converter must be set high (for at least...

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