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sketch for arduino obstacle robot using seed motor shield v2.0?

hi everybody, im barely started writing sletch so i need help,

i build a obstacle robot and i used 

arduino uno r3
seeed motor shield v2.0
one servo
tamiya twin motor gear box
hc-sr04 sensor 

so i dont really know how to start writind the sketch.....

Check the arduino forms. You'll find all sort of sketches for that setup. All check seeed studio. They will have downloads of example sketches for that shield.