I am trying to interface a 3.3volt TTY bluetooth dongle to my arduino. The dongle requires 3.3volt but the arduino's Tx and Rx signals are 5 volt. Apperently the 3.3volt is enough for the arduino Rx, but the 5volt Rx for the bluetooth will be too much.
I have a couple PNP transistors laying around. I am not at all familiar with transistors (I do more with large electronics and relays). I know that a transistor can be used similarly to a relay though.
Would it be possible to control the state of the transistor with the 5 volt Tx from the arduino. But have the transistor output 3.3volt from a separate power source?
If it is possible. How can I do this? Could someone please explain.
Thank you.