Enter My Carnival, which will use a standard PC mic to track a child's breathing in and out, and can be adjusted depending on the child's ability. Once the breathing is tracked, My Carnival then translates that into playing games at an busy carnival, having the player do things like fill a balloon with a water stream.
You can contribute to the project right now. AccessAble's "tipping point" budget of $29,000 would cover just four minigames, but the full budget of $40,000, if raised, would provide for eight minigames total. Currently, the team has only raised just over $1,000 with 23 days left in the effort.