I'm building a project with standalone ATMega MCU with Arduino bootloader. Most of the time chip is in a sleep mode. When the chip is waked up with external interrupt I need to turn 16x2 LCD screen (LCD controller and backlight) and a couple of sensors.
My plan was to put some transistor and control it using spare digital pin to turn load (LCD, sensors) on and off.
What transistor to choose? Which one will be efficient in terms of power saving (most of the time it will be closed, when MCU is in sleep).