Dragon Tamer
Member
A limit switch does have a spring in it. If it didn't it wouldn't be much of a limit switch (it would just be a switch). Most limit switches nowadays have 2 positions, a normaly closed position and a normaly open position. What you want to use for your prodject is a normaly close switch (PBNC) so that your liniar actuator can run properly as long as the switch is pressed. Just going by a breif look at your schematic, I think that you may need a by-pass diode on the limit, so that the actuator can run in the oposite direction even if the limit swithc is pressed. By the way that link to the solar tracker does have limit switches in it, but the circuit does not work, we had a nice descussion before about that.