This is a robot that run away from barrier with Arduino. It can be seem useless. However it improved my information of software and electironic. The used materials are: Arduino uno, 6 V Dc engine, plastic wheel, bread board, cables, HC-SR04 sensor, L2993B engine driver, drunk wheel, screws and nuts, copper plate and 9V battery.
If you want make a robot like this you can contact with me.
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From @sametceylan