PSM

Home Up PSM External Power Files

Discontinued.

IMPORTANT NOTE:  Use only 4 to 6 VDC Regulated power supplies with the External Power Jack!!  See here for more details.

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Propeller System Module (PSM)   

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 Now Available at Gadget Gangster! 

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The PSM User Manual

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PSM Introductory Presentation

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PSM File Downloads

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The PSM is a Propeller based TFT LCD display module.  

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Features:

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QVGA 2.4" TFT LCD with 320x240xRGB resolution and backlight

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Propeller Microcontroller running at 80 MHz with 8 independent cores (cogs)

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USB and logic level serial interfaces for control and/or programming

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3-axis accelerometer to detect device orientation

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Stereo headphone output

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Full size SD card memory expansion slot

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One uncommitted pushbutton

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Eight uncommitted I/O pins

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I2C expansion port

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One uncommitted 8-bit ADC input

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One uncommitted 8-bit DAC output

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Electrical:

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Powered by USB, 3-pin header, or standard 5.1 mm barrel connector

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Header ports provided for ADC, DAC, I/O pins, power, and RS232

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Physical:

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Circuit board is 3.8"x2.5"

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The 4 mounting holes provided are spaced 3"x2" apart.

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Modes of Operation:

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The PSM is preprogrammed as a simple RS232 controlled display module with advanced options such as file access to FAT16 formatted SD cards.  But, it can be custom programmed using Parallax's free development tools.  The display will offer several modes of operation:

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Serial command mode accepts commands and data to show text or graphics in any color at any location on the screen.  This is the normal mode of operation when being controlled via the RS232 interface.  Two sizes of fonts are be available.  High-color photos can be displayed in this mode either over the serial interface or from the SD card. 

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In Propeller TV/VGA compatibility mode the screen is represented by a 20x15 array of tiles in the same way the Parallax's standard TV/VGA drivers operate.  This allows the developer to use the existing code base with only minor changes.  This also allows double-buffering for fast, full-screen updates.  Also, the standard "Graphics" driver can be utilized in this mode.  Concurrent LCD and TV/VGA display are possible in this mode.

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These two modes can be combined in many ways depending on the particular usage required.  The programming tools are provided by Parallax (only a USB cable is required).  Source code for the modes of operation listed above is provided at no extra cost.

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Expansion:

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The PSM can be expanded using the 8 uncommitted I/O pins, the RS232 interface, and the I2C bus. 

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The PSM BCKVM Accessory board (sold separately) attaches to the PSM to form a complete, stand-alone, system.

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Custom accessory boards for the PSM are easily created using the ExpressPCB.com header layout provided.  This allows fast prototyping at low cost. 

 

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