I'm trying to use a SCP1000 pressure sensor (from Sparkfun) and a data logger shield (from Adafruit). They both use SPI communication, but the chip select on the SCP1000 doesn't work properly. So, once I write to the SD card the SCP1000 crashes and requires a hard reset (turning off power).
So, is there a way to turn off the power to the SCP1000 through the Arduino software? It uses 3.3v, so I can't just turn on and off a digital pin. Would a transistor work? (5v digital pin to base, 3.3v to collector, then emitter to pressure sensor) Can you even use a transistor to switch lower voltages?