Non ha funzionato correttamente, non so perché. Utilizzare invece Arduino con interruttori di arresto al piano/sensori ottici e pulsanti di selezione del piano all'esterno della porta. Non dimenticare gli interruttori di sicurezza all'apertura della porta

Therein lies the problem: this was a double loop system with what I discovered was a deep shaft concealing a counterweight, which took over 100 ft of old hemp rope. The counterweight shaft was in an inaccessible area and unable to be cleaned out, so making it operate as it did almost a 100 years ago was not feasible

This is the problem using antiquated circuits - it failed as you suggested correctly because of the feedback even though diodes were installed. Suggest using an Adarino with floor sensors/ switches instead.

www.kyleswitchplates.com/sierra-low-voltage-3-pushbutton-switch-wall-plates/ The push buttons themselves can be found on eBay in various sizes and amounts

@@jstevens9806 one more question. What controller are you using.thanks.

Garland, My project was a little more intense since there are three floors, but it's only a matter of simple relays with a 12-volt source, and a dead stop safety at either end. The buttons you choose which are available online, triggers the relay either up or down, until the dumbwaiter hits the dead stop. An older folk myself, I should have just gone ahead and used an Arduino computer, but you know, I'm old school and I just had to try it. I may redo it with the Arduino anyway.

Whoops, forgot: For safety sake, make sure you have some sort of switch on each door to disconnect the power to the entire relay system if the door is open.

@@jstevens9806 Thanks so much. I appreciate your advice (and creativity). I'll also look into the computer option. Planning and designing is half the fun. Garland

Yes I really did this for real and it worked, however there's a hidden feedback loop that I can't trace. I suggest you use an Arduino instead of the physical crap we get from China