Change variables to html

Good evening. I apologize for my English and I hope to write in the right section.

I would like to make an automatic irrigation plant with Arduino. I would use 4 different valves at different times. So far so simple, but I would Also be incendio modify schedules from PCs and smartphones, using a wifi module.

Here my knowledge they stop and ask you. I thought about putting times on / off using variables, and then edit them from the web interface. It is possible to do it? As? Thanks so much!

If you do not have an Arduino already, maybe the following would would be interesting

nodeMcu ESP8266 based system

NodeMCU-Development-Kit-NodeMCU-Motor-Shield 8,40€