Propeller development board USB firmware
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README.md

Propeller Development Board

The Board

This is my own version of a Parallax Propeller development board.

Uses a PIC microcontroller for the USB-Serial interface, can be powered from either USB or a dedicated power source, includes an EEPROM to store the program and data, and provides a 2x20 pin header exposing all 32 I/O pins from the Propeller microcontroller, power and control lines.

Compatible with all standard Propeller development tools.

Parts List

  • R1 = 4.700 ohm 1/4 watt
  • R2 = 4.700 ohm 1/4 watt
  • R3 = 220 ohm 1/4 watt
  • R4 = 220 ohm 1/4 watt
  • R5 = 220 ohm 1/4 watt
  • R6 = 33.000 ohm 1/4 watt
  • C1 = 100.000 pF poli
  • C2 = 100.000 pF poli
  • C3 = 100.000 pF poli
  • C4 = 10 uF 63v elettr.
  • C5 = 10 uF 63v elettr.
  • C6 = 100.000 pF poli
  • C7 = 27 pF disc
  • C8 = 27 pF disc
  • C9 = 10.000 pF poli
  • DL1 = Red LED
  • DL2 = Yellow LED
  • DL3 = Green LED
  • XTAL1 = 5 MHz crystal
  • XTAL2 = 12 MHz crystal
  • IC1 = P8X32A
  • IC2 = 24LC512
  • IC3 = PIC18F14K50
  • IC4 = LM1117T-3.3
  • TR1 = Transistor NPN BC547
  • CN1 = USB-B connector
  • CN2 = 2.1mm DC power connector
  • CN3 = 2x20 pin header
  • JP1 = 1x3 pin header
  • P1 = Button

JP1

Power source selection:

+-+  
|1| USB  
|2| VIN  
|3| EXT  
+-+  

short pins 1-2 to power from USB
short pins 2-3 to power from external source.

CN3

From top, P0/P1 are near the PIC/USB microcontroller.

+-------+-------+  
|     P0|P1     |  
|     P2|P3     |  
|     P4|P5     |  
|     P6|P7     |  
|     P8|P9     |  
|    P10|P11    |  
|    P12|P13    |  
|    P14|P15    |  
|    P16|P17    |  
|    P18|P19    |  
|    P20|P21    |  
|    P22|P23    |  
|    P24|P25    |  
|    P26|P27    |  
|SDA/P29|N.C.   |  
|SCL/P28|XI     |  
| TX/P30|RTS    |  
| RX/P31|CTS    |  
|  RESET|+3.3v  |  
|    GND|VIN    |  
+-------+-------+  

PCBs are shared on OSH Park and can be ordered from there: https://oshpark.com/shared_projects/KALqBSpm