Cubot

thingiverse

A robot based on Zowi but much cheaper, materials cost less than 10€. It's just necessary: An Arduino Nano, An ultrasonic distance detector, 4 servos of 9g, The battery holder, And a micro switch, http://www.mediafire.com/file/5vts8i4zjrdmh2p/Cubot.ino/file And here's the code for Arduino Nano. The programming I have done is that walks and dodges obstacles, depending on whether the obstacle is to the right or left it turns to the opposite side. And if it is too close it also walks backwards. Besides you can add more cheap things like Bluetooth or other sensors and program it as you want.