My thought was to create a unit - using parts at hand - so that I could open the door from the tractor as I drove up. The setup unlocked the door and would open & close it. It was 100% 100V AC - no low voltage for signal control here (I also unplugged the unit when leaving the shed for fire safety). It moved FAST and could have had the motor speed reduced more.
Bottom limit switch
Unlocking solenoid & the door's lock mechanism - door unlocked.
Once the "OPEN" command was issued the solenoid would pull the release
latch for the door lock and have it unlocked before the door moved too
far open (power for the door open and the unlock were issued at the same
time - good thing the solenoid and unlock assy was faster than the doors
Position of the bottom 'finger' & directional switch (center of
Motor & pulley arrangement
Pulley setup & chain sprocket - door closed
Top finger directional switch for the motor
Chain & sprocket set - door open
View of the secondary shaft - position of the pulley & chain sprocket
- picture of the wood arm that turns the motor off when the door is open
Location of the two pulleys that guide the cable