Handheld Low-cost Ultrasonic Sensor with Audio Output

hi everyone,

based on request, have put complete how-to on arduinoinfo.info wiki here:  it looks this:


this simple: arduino/yourduino, ultrasonic sensor , beeper. example code provided.

it senses distance objects 2 m (6 feet) in front of sensor , produces audio beeps denote distance. there 3 zones beeps getting faster in each zone , switching high tone in next zone. last 25 cm can sense small differences down 2 cm.  

the usual problem taking works, this:

and packaging portable , stand up.

i lurking through walmart , home depot etc. looking stuff become arduino parts.

at walmart found $3.77 waterproof lantern used in project. used lots of other arduino-based projects need outdoor case, batteries , maybe on-off switch. remote temperature / humidity / other sensing nrf24l01 radio, wildlike sensor / camera control. etc.  etc.  if makes project based on case, please let me know , i'll add  arduinoinfo.info wiki:

also, project linked section called  understanding science behind ultrasonic distance sensor (click):
that in turn links educational lesson plans , slideshow can used in classroom (my wife still updating that). if uses in class or helps teacher please let me know. may make low-cost parts kit available.

any feedback or suggestions appreciated!

that's ingenuous idea. i'm wondering whether possible keep lens cover in place. suspect not, if able ultrasonic sensors working through project might still waterproof well.

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