This is the development board I've just created.
I've already posted all relative software on this forum (see below).
Voltage converter 3 to 5 Vcc for I2C
I2C RTC Clock
I2C LCD driver + LCD
Active 3V buzzer
Relay board 3V
Infrared Led receiver
Blue Led 3V
Note: +3V from serial interface, +5V from USB port, GPIO 0,1,2,3 from JTAG