Electronics > Electronics

low voltage motor that will open a switch

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scottknightus:
I don't mind the expense or having to power the unit.  I just want the transmitter small enough to hold in one hand.  Are there any small servo transmitters without x and y axis joysticks that I could use?  I just need a on/off button to activate the servo or whatever will trigger the unit. 
  Thanks for your paitience; I'm new at this and I don't have the knowledge base to communicate my needs.

Admin:
Hmmmm yea I dont think they make any that are single button devices.

This is the smallest I can find:
http://www.servocity.com/html/3_4-ch_neon_fm_systems.html

You could consider hacking it open, taking out only the components you need, and putting the components into a smaller box. I have opened up a transmitter before and they have tons of wasted space in them. The joystick can be replaced with a button, too.

The less attractive option (because I couldnt find any available to buy):

You might want to consider making one . . .
http://www.uoguelph.ca/~antoon/circ/tx15trak.htm
http://www.discovercircuits.com/R/rftrans.htm

All you really need to do is have the transmitter button release a high powered EMP that can be detected by a reciever.

The reciever would then flip on a MOSFET (http://www.societyofrobots.com/electronics_advanced_components_tutorial.shtml#mosfet) that would drive a solenoid (http://www.societyofrobots.com/actuators_solenoids.shtml).

I have never built a transmitter/reciever system so I cant really help . . . sorry!  :-\

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