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I've been doing a bit of researching lately and have decided upon buying a microcontroller board to start some projects with. The only problem i am having at the moment is that i cannot for the life of me find a range finder in Australia! Does anybody know of a store which has a basing in Australia that will have a sharp IR range finder? I have looked at some which do not have a shop/warehouse in Aus however i would really like to find something from within Australia so that i will not have to pay for so much shipping.
yea i got smae problem spipping like 9$ us... sigh oh well ill just stick to photocells
hmmmm I don't think there will be a store that sells any . . . is shipping from singapore cheap for you? there are a few online robot stores based there if you google it . . .
Actually, does anybody know an alternative to using a sharp ir range finder when all i won't to accomplish is obstacle avoidance?
QuoteActually, does anybody know an alternative to using a sharp ir range finder when all i won't to accomplish is obstacle avoidance?Well, you can use two photoresistors seperated by ~2 inches.http://www.societyofrobots.com/schematics_photoresistor.shtmlThen get a really bright low angle green LED (~15 deg, 4000 candela+), and put it right next to only one of your photoresistors.Light will shoot out from the LED, bounce off of close objects, reflect back, then only hit the closer photoresistor.Subtract one photoresistor ADC value from the other and that will be the range to the object.Why use a second photoresistor? Its a method to cancel out ambient light.