Non-English deleted - moderator.

Hi it would be better if you use English language since this is a foreign website. Are you required to use sensors that are dedicated to human?
 
hmm. actually since it is not yet our thesis project, and its only a requirement for finals, we're planning to make just a miniatured door. maybe a sensor for only a thing or material could be used.
 
ezy_CoE you could use sensors like TSOP series. You can google 'em and have a look I already did an obstacle avoider mobile robot and I believe you will be taking the same path I've passed
 
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