I have bought from ebay a dozen of ultrasonic sensors (model: us - 015) because the specifications were saying that it has a detecting range of 4- 700 cm. Unfortunately it doesnt, for people detection it falls to hardly 350 cm, if you are lucky 380cm.
My question is: can I in some way increase the range of these sensors?
As far as my understanding goes, the higher the operational voltage is, the longest the range. The normal operating voltage of these sensors is 5v (and less that 3mA) . I was thinking that i could try and operate them at a higher voltage (say 6 or 7 volts) and see the results (they are quite cheap so i can afford burning some). Maybe if I powered my arduino via a 12V external power source, access it through the Vin pin, and adjust it with a potentiometer? (Also i have to mention that i don t care if the resolution decreases)
How does it sound?
Please any improvements, suggestions or ideas are welcome!!