I’m engaged in battle with a LinkSprite JPEG camera and I find that it needs to run at 5V on my 3.3V arduino circuit. I’ve used a voltage divider to get the transmit pin from the camera down to the 3.3V for the arduino but the camera does not appear to be responding to the arduino commands. I’m assuming that I need to increase the voltage of the arduino signal to 5V for the camera. Is a NPN transistor the correct way to manage this signal? Does anyone have simple guidance on a circuit that would do the job?