oo nga sir anong mechanism yung pag-akyat nung fixed frame?
i used a pulley and wire rope to pull the screen up/down sir. the screen has guides on each side para stable and wire rope is connected on top center of the screen by a u bolt. the other end of a wire rope is connected to a chain that is also connected to a sprocket which is also connected to a 12v gear motor. nakakalito ba sir, hehe. parang sa bike lang na naka-loop yung chain pero in this case limited lang run ng chain just to simulate up and down, depends on the direction of the gear motor which is also wired to the same relay board for the masking system para isang power supply lang ang gamit.
this would have been simpler if i just used an automatic roll-up screen but the problem with those is the wave it develops overtime. tensioned screen would have been the best but i couldn't find one locally. importing one with that size wasn't logical to me. so diy route seemed to be the most practical way.
