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Photoelectric barrier

hi everybody!

i’d like to react on the movement of people. when somebody goes through the door a soundsample should be played. so i’m wondering what’s the best and fastes way to do that?

i thought about using a photoelectric barrier, but i don’t know too much about electronics. i found one here:
http://www1.conrad.de/scripts/wgate/zcop_b2c/~flN0YXRlPTM4NDE3NTY2Ng==?~template=PCAT_AREA_S_BROWSE&glb_user_js=Y&shop=B2C&zhmmh_lfo=&zhmmh_area_kz=&product_show_id=178513&p_init_ipc=X&p_page_to_display=fromoutside&~cookies=1&cookie_n1=b2c_insert&cookie_v1=F0&cookie_d1=&cookie_p1=%2f&cookie_e1=Mon%2c+27-Feb-2006+16%3a29%3a39+GMT&cookie_n2=b2c_hk_cookie&cookie_v2=WW2&cookie_d2=&cookie_p2=%2f&cookie_e2=Mon%2c+27-Feb-2006+16%3a29%3a39+GMT
but it is more expensive than i thought and i was wondering if anybody ever tried to connect a photoelectric barrier with vvvv and has some tips for me?
i really don’t know what pnp and so on means…

or is it better to use a camera and analyze the picture?

thanks for your help!

yes i think it´s better to use a camera , and easier …
you can use the pipet to do this things or a new freeframe tracker from marc_s

deeplinking to conrad products is always a problem (so better just give the order code) - you are referring probably to this product:

REFLEX-LICHTTASTER SA1E-DP, Artikel-Nr.: 178513 - 62

this is a nice, professional and simple light barrier module. look in the pdf and see page four in the upper left. this is the most interesting schematic.

to connect it to vvvv i´d open up a cheap usb mouse or joystick and use a relay (e.g. conrad 502826 - 62) to close one of the switches in the mouse or joystick when the light barrier switches its output.

while you´re at conrad: a simple sound playback module (or a discman) might do the same trick completely without vvvv