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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by brainiac-boy[/i] [br]Dear Sirs first of all... I'd like to thank you all for being in this creative forum, hope I'm not a pain in the neck well, spending much time on the toilet seat sometimes brings ideas, some are brilliant , some are fake![:D] i was thinking about a new low-budget radio based (silent) car security project, using some of the radio projects here might be useful.. i donno if this is gonna work but you guys are the experts and capable of giving positive feedback to correct wrong points or ideas.. a brief description... * a radio Tx unit will be installed in the car in a hidden place, triggered using microcontroller or switches by the following actions 1) any of the 4 Doors open 2) bonnet opening 3) back cargo opening * the Tx should have a min range of 70 or 80 meters in case of parking far from home or work * the Tx will be assumed to work on the FM Band ( less noise susceptibility ) * the Tx will generate a tone on an unused frequency on the FM Band Rx portion: * the receiver will be designed for mobility (works on BATT outdoors, works on a DC transformer indoors) * the receiver will be only tuned on this specified frequency * the Rx will respond only to the tone reception, and alarms by triggering a buzzer circuit or something.. i know it sounds weird but it's just an idea, in addition i'm not sure if the receiver will not be sensitive to household equipments or even worse like laptops that generates frequencies all over the FM band with a strong amplitude but i'm sure you guys can come with better ideas, maybe using mobile phones might be the solution to the problem ...[:)] [/quote]    Insert an Image File (GIF, JPG, JPEG, BMP, ZIP, PNG) Check here to include your profile signature.