Hi everyone, I'm a complete nube so I hope my question isn't completely daft but does the Parallax PING sensor have a built in resistor or do I have to put one in the circuit between it and the arduino board. The specs say it wants 30 milliamps supply but nowhere can I find any reference to whether it has the resistors already or I need to add them.
OK great! It seems to be working perfectly just hooked up directly to the arduino. I didn't want to fry it! This is some cool stuff but a steep learning curve for me, I hope to make some robots once I get the basic down.