I have a 3.3V Pro Mini and a 3.3V Sparkfun FTDI board for programming (SparkFun FT231X Breakout BOB-13263). No problems there.
Question: Can I use the FTDI board to power anything else, like the LCD? The breakout board is supplying power to the Pro Mini board and there is 3.3V on the Vcc pin. Can I use the power on the Vcc pin to run the LCD?