This project is called SAPPC for its acronym in Spanish: Pedestrian Crossing Presence Warning System and is a prototype for advising when a pedestrian is crossing a crosswalk (usually without traffic light) . This system consists in two totems with lights that flash when the pedestrian is crossing the road. The enterprising and inventors of this system are Estrella Carraco y Pedro Olivares, and they ask to Ingenyo to design and develop the complete electronic sub-system: pedestrian ultrasonic detection, radio communication between both totems, lighting, solar cell, battery and charger. This project can work in areas without external power, and is environmental friendly.