Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Well... You could just buy such things, at any electronics store. Or if you wanna put yer hand in it, you need first of all something to work as your display. There are small cristal-liquid screens that have pins in order to display a message, or you have those digital boxes, where you have 'n' digital places, you could fill'em up. Then, you need your circuit... What exactly do you need to do with it? Is it just a counter? What's an odometer ... Is it a meter for odor? I mean, smell??