Let say you have a digital indicator which consists of 7 lights as you see below. You are trying to make as many distinct digits as possible but there is a requirement for that:

• At least one light should be on to be counted as a shape.
• If more than one light is on, all lights are supposed to be connected directly or indirectly. (for examples all numbers in digital form are counted as digits.)

So, how many digits can you create with only one digital indicator?