I have a Wowwee animatronic robot that I've been tinkering with, with the goal of hooking my arduino up to it so that I can control it from my computer.
The problem is, using a multimeter, I've tested that the voltage on the robot's control lines/pins is 3.3v; but the arduino outputs 5v through its pins.
Will hooking up the arduino and using its 5v pins damage the robot? And, realizing this is likely subjective to the robot's specific electronics, is there a way I can test/see/analyze if it would be ok to use 5v digital signal on its lines?
If not, I've been researching the feasibility of just putting a resistor on each of the arduino's output pins to bring the voltage back down to around 3.3v (although I'm not sure if I might need a more in-depth solution, as that would "corrupt" the digital signal?).