I've looked through the forum and checked the approved devices, but I did not seeing much on driveway detectors. Because of wildlife in the yard, motion is out. I've ordered a Mighty Mule magnetic sensor to play with. They get decent-to-good reviews and are about 1/3rd the price of Dakota. My driveway arrangement looks good for placing one of these magnetic sensors. There's a hack out there soldering the receiver to a contact sensor, so if the MM actually turns out to be any good, it could be patched into the HE TTS.
Anybody worked with the Mule? Or have other brilliant driveway announcer options?