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The Chamberlin sounds like it wouldn't be any better than the Harbor Freight unit which costs much less.
Gates are better!
I have one of the HF units I bought on sale for $10. It will detect ANY movement so may not be good for a driveway sensor if you have a lot of critter traffic. You might could mount on a pole and aim it high enough to make it work. I use it when I have an armadillo digging up the yard to detect when it shows up. I might try mounting it on my inside keypad post to see if it works without a bunch of false alarms but it would only go off when the wife comes and goes.
Gates are better!
I have one of the HF units I bought on sale for $10. It will detect ANY movement so may not be good for a driveway sensor if you have a lot of critter traffic. You might could mount on a pole and aim it high enough to make it work. I use it when I have an armadillo digging up the yard to detect when it shows up. I might try mounting it on my inside keypad post to see if it works without a bunch of false alarms but it would only go off when the wife comes and goes.
