Output: pink ratchet wheel of two teeth, rotating 180 deg. each time when yellow pawl leaves it thanks to a spiral flat spring.
Outer end of the spiral flat spring is fixed to the pink wheel.
Inner end of the spiral flat spring is fixed to the blue ratchet wheel hub.
Orange pawl prevents clockwise rotation of the blue wheel.
The video shows also the winding up the flat spring by turning the blue wheel anticlockwise.