Hi all,=0D I am an master student in robotics and automation, and I am building a h= exapod robot for my dissertation. Could you please give me any informatio= n about sensors available for mobile robots especially legged ones. I kno= w that there's a book around but I can't afford it. So is there anyone ki= nd enough to tell me what sensors i could use and brief information on ho= w to interface them (h/w & s/w interface) with 16f877 or at least any web= site giving such informations. The ones that I am currently using are si= mple IR photodiodes (18 to 20 degrees) for object recognition, photoresis= tors (LDRs), ultrasonic and I am bit confused about the type of contact s= ensors I could use. A web site would be enough, but could u propose a typ= e of contact sensors and especially a good Tilt or INCLINATION sensor. i = am currently using a tilt switch which is off at 90 degrees. Imagine the = robot to get an inclination of 90 degrees until the switch goes off!!!! I= guess there's no coming back from that state. Anyway any help would be g= reat. Thank you guys.=0D =0D yours,=0D Elias Nakos -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.