PKS

PKS

The PKS (Propeller Keychain System)

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



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

Packed with additional features:

	3-axis accelerometer
	Real time clock
	buzzer
	battery monitor circuit
	Prop Plug replacement mode: Use the PKS like a Prop Plug to program other Props!
	Can optionally replace flash chip with 32Mbit version.

Software

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

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.

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.

	PKS Graphics Demo : A lot like the Parallax Graphics Demo for TV, only smaller
	PKS Accelerometer Test : Test the onboard 3-axis mems accelerometer
	PKS Buzzer Test : Test the onboard buzzer (/speaker?)
	PKS Flash Test : Test the onboard 8Mbit Flash memory chip
	PKS RTC Test : Test the onboard DS1399 real time clock chip
	PKS Battery Monitor Test : Test the onboard battery voltage monitor circuit
	PKS Prop Plug Mode Test : Allows you to use the PKS as a Prop Plug !

Circuit board pictures

Top:

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

Bottom:

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

Schematic

	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.
	(click for full size)