Jonathan Hallameyer wrote: > On Wed, Aug 11, 2010 at 1:02 PM, YES NOPE9 wrote: > > =20 >> I want to be able to robotically press buttons on a cell phone. >> This means the throw of the button press will not be more than 5mm. >> I have seen mention of buttons requiring 21 pounds of pressure. So >> far intergoogling has not revealed consistent data. >> I want a solution that costs ~$2 per pressor. ( I can dream ) >> >> One thing I am considering is some kind of doo-hickey using nitinol >> wire. >> Any suggestions or sources of button pressors ? >> >> Gus >> >> >> =20 > Where did you see 21 lbs of pressure was needed? a quick experiment with = my > cell phone and a bottle with ~ 8 fl-oz of water in it say otherwise :o) > Also, how fast are you trying to push the same button? Since you mention > nitinol I'd imagine not too fast. While I dont know the price per foot = of > nitinol wire, that actually doesnt sound like that bad of a solution, jus= t a > ~10-15mm thick piece of aluminum or heat resistant plastic, with pegs ove= r > each key, and a piece of nitinol strung over each peg. Guessing taking > apart the cell phone and using strictly electrical means isnt an option? > Perhaps with a spring for some pre-load something like a relay could > be hacked as an actuator. > > Or just cheap surplus solenoids like I just found > http://www.goldmine-elec-products.com/prodinfo.asp?number=3DG16036 > > I suspect 3.7 lbs should be enough, but even if its not, a solenoid with > that much throw could have inertia to help it out some too. > > Jonathan Hallamey > =20 Just a note the solenoid pictured is a pull type. Bob --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .