How do I use a 3.3v micro with 5v signals & transistors?
I need some help with a gap in my electronics knowledge. How do I use a 5v signal as input to a 3.3v micro controller, and inversely how do I switch a transistor with 5v load, from the same micro's output pin? (@3.3v)?
Can I just use a suitable resistor on the input pin, and for the output can I simply drive the 5v transistor with 3.3v at the base?