• usually the mechanics of  a toy capsule machine is operated by coin
• only a round object can push up the "obstacle" that blocks the notch

Solution

1. This capsule machine is no longer control by coins
2. if the sensor sense someone toss a ball into the machine, another motor will put the "obstacle" latch to let user to spin the notch

Below is the full mechanics concept of this capsule machine

The concept mechanics of the capsule machine

1. Once the sensor sense user toss in a ball, it will open up the latch and let the ball fall in

2.at the same time the notch will be unlock by showing green led

3.the ball holder will lead the capsule ball to the exit point of the machine