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Name: RPi EL-BOARD
Type: Raspberry Pi Board
Version: 1.0.0
Author: Dubravko Penezic
Copyright: Creative Commons BY-NC-SA v 3.0
Implemented function:
Fix RPi BUS Cable Connection
10 GPIO with bidirectional level shifting (5V or 3.3V)
I2C bus with bidirectional level shifting (5V or 3.3V)
RS232 bus with bidirectional level shifting (5V or 3.3V)
2×10 headers for connecting to GND, 3.3V, 5V, 10 pins, I2C and RS232
Internal AS1117 3.3V voltage regulator (500mA, and 5.1V protection)
DS3231 RTC
DS1307 RTC
AT24Cxx EEPROM module with Write Protection option
FT232RL RS232 to USB adapter with straight or cross connection of TXD/RXD between RPi and FT232RL
3 tactile switches connected to GPIO with 4pin header (GND and 3line to switches)
RGB LED (or 3 ordinary LED) with transistor controlled output (available on 4 pin header plus 5V) and LM317 current controller
6 Selectable 3 pin header for selecting LCD screen BUS or 3 tactile switch and RGB LED possibilities
16 pin female header for LCD screen connection
PCB Top & Bottom image:
Schematic:
Schematic in PDF format
Functional example