Timer relay using ESP webserver

Why I made this? Recently I had an issue with my smartphone. Let me explain, the battery bulged and opened the back cover. I went to mobile repair guy, he said, “It’s because you charge your phone to 100%”. Honestly, everyday I just plug the phone to charging and go to sleep. I thought the makers of my smartphone are smart enough to integrate an overcharge protection circuit. Never mind, what can I do as an electronic engineer to solve this issue. I cannot tweak into charger or mobile but the thing I can do is, cut-off the mains supply using a relay after fixed time duration. which can be preset for time duration it takes for mobile to charge near to 95%. That’s why, I decided to make this “IoT timer relay”.It will also solve my other problem, like sometimes forgetting to turn off electrical appliances. It takes me maximum 10 min to iron the clothes, so I will set the timer relay for 10 min. What it does? Fig 1 - Block diagram This IoT timer relay is a simple electronic device t...