While go through the project for "Automatic hand sanitizer" https://circuitdigest.com/microcontroller-projects/automatic-hand-sanitizer-dispenser-with-covid19-live-updates, there are two below queations come in my openion in respect of life lasting of DC submersible pump motor and relay used for this project.
1) Mini DC Submersible Pump:- As the pump is to be frequntly on and off , will this low cost (pic attached) pump able to operate and withstand that all frequent () on/off operation, if so then will not be the life cycle of this pump very poor.
The pump is to be immersed in liquid/sanitizer, if the liquid level goes down below of the pump, the pump will get damaged, so life of the pump is also questionable here too.
In a straight-way , I want to know, is there any excellent quqlity of pump available in market for these type of oprtation?
2) Relay used in a relay module:- this also be the questionable for the life cycle of relay. can be used as a substitute of relay other component like triac and n-mosfer to drive the pump for which can last the system for long?
I hope i will get all your positive feedback for above two questions...