You were thinking weren't you. Of course you were. You purchased this home gym to improve your life, your health and to feel better about yourself. You just lost your motivation. Lack of motivation may seem like a big thing to you but its easy to get back.
One of the first steps is to remind yourself of why you purchased the treadmill, the exercise bike the weights, etc. Because you wanted to get in shape, just like Richard Simmons right. Well maybe not exactly like Richard Simmons. But his story is an inspirational one. How he lost all that weight and now he's a famous exercise guru. The same thing could happen to you. All you have to do is get back on that treadmill.
Secondly, sit down, do not pick up the remote. I know its tempting but ignore it for a few moments and decide when and how often you are going to use that home gym. Nothing says you have to spend hours at a time in there. That's one of the perks of having a home gym. So you can jump on the rowing machine for that fifteen minutes between when you get home from work and the kids get home from school. Fifteen minutes a day and you've all ready made more use of your home gym than ever before.
Thirdly, once you come up with a schedule stick to it. A good way to get motivation to do this is to promise yourself a special treat for each time you use your gym, like a bubble bath.
This is a sure fire way to get the motivation to maintain your home gym routine. You can also look up home gym reviews to get an idea of which pieces of equipment will work well for you in your gym.