Our version of the portable radar system for blind or visually impaired : its concept was invented by Steve Hoefer (http://grathio.com ) to be made with one’s family for less than 50 $ and to learn about arduino and digital manufacturing. Les tutoriels associés au projet Ultrasound sonar glove / 3d printed version How to make an ultrasound sonar glove that detects obstacles for less than 50 Euros. Initial project from Steve Hoeffer updated by Q. Orhant and Y. Le Chevalier / MHK. Translation by Marie Brouard.