I have a touchscreen that uses the following GPIO pins on my B+:
PIN NO. SYMBOL DESCRIPTION 1, 17 3.3V Power positive (3.3V power input) 2, 4 5V Power positive (5V power input) 3, 5, 7, 8, 10, 12, 13, 15, 16 NC NC 6, 9, 14, 20, 25 GND Ground 11 TP_IRQ Touch Panel interrupt, low level while the Touch Panel detects touching 18 LCD_RS Instruction/Data Register selection 19 LCD_SI / TP_SI SPI data input of LCD/Touch Panel 21 TP_SO SPI data output of Touch Panel 22 RST Reset 23 LCD_SCK / TP_SCK SPI clock of LCD/Touch Panel 24 LCD_CS LCD chip selection, low active 26 TP_CS Touch Panel chip selection, low active
See here for better formatting. My goal is to keep the screen and make the Make FM Pirate Radio Transmitter. However, it uses GPIO pin 4 for the transmitter, which is being used by the screen. So, my question is, are there any pins left that I can use for the transmitter because I know not all pins can do the same things. Or, can I use the same pin for two different tasks(I don't think you can but am not sure)? I would like to keep the same performance as would be had on pin four.