Woman vs Sprinkler System

Our pesky gardener is having a laugh. He keeps changing the sprinkler system start times. Not a massive deal I hear you say? Well only that it costs an arm and a leg to water our garden so naturally we only want to use the minimum amount of water necessary. Also it kinda freaks Buddy out if he's anywhere near the grass when it comes on. So I took control of the controls, and figured out how to set the start and run times and then locked the box! Slightly smug i sat back and smiled. Next day; the box was open and the sprinklers came on at my times plus their times. Not the result I had anticipated. Anyway, i have now fully read the instructions, removed their start times and I'm confident I have finally won the battle. For the time being. Meanwhile, Man vs Ants is not going so well...