PKS

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The PKS (Propeller Keychain System)

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We've replaced the circuit board of the Coby 151 digital photo album with a custom Prop board!

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Using the original LCD, 8Mbit Flash memory chip, and LiPo battery pack.

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Packed with additional features:

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3-axis accelerometer

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Real time clock

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buzzer

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battery monitor circuit

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Prop Plug replacement mode:  Use the PKS like a Prop Plug to program other Props!

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Can optionally replace flash chip with 32Mbit version.

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Software

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Software is in development, but many basic test codes are already available

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These test codes are all based on a TV-like driver.  This driver acts pretty much the same as the original Parallax driver for TV, but outputs to the PKS LCD screen.

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Note:  If you have a TFT screen, you'll need to make a small change to the code to select the other driver as noted in the code comments. 
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PKS Graphics Demo :  A lot like the Parallax Graphics Demo for TV, only smaller

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PKS Accelerometer Test :  Test the onboard 3-axis mems accelerometer

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PKS Buzzer Test :  Test the onboard buzzer (/speaker?)

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PKS Flash Test : Test the onboard 8Mbit Flash memory chip

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PKS RTC Test :  Test the onboard DS1399 real time clock chip

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PKS Battery Monitor Test :  Test the onboard battery voltage monitor circuit

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PKS Prop Plug Mode Test :  Allows you to use the PKS as a Prop Plug !

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Circuit board pictures

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Top: 

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Note:  The battery voltage monitor circuit was an afterthought, which is why it needs the jumper wire.
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Bottom: 

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Note:  The series 24 Ohm resistor for the buzzer is an afterthought, which is why the buzzer is rotated.
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Schematic

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Note:  There is an error in the schematic concerning how the reset line is connected to the 4-pin PropPlug port.  The reset pin at the 4-pin port is actually connected to the junction of the 100-Ohm resistor and the collector of the NPN resistor.
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