Will pày for help in designing a small PCB. (Delhi pref. But not necessary)

Hello, i have a requirements to design a pcb. I can give reference image of complete pcb which someone has already made i need to make like that with some minor improvement.

So basically it will detect voltage healthiness of a 240v voltage source which we can check with a small transformer or anything with àn ic, adc, optocoupler or etc we have options. but need the minimum cost as much as possible. Components i will source whatever needed.

FUNCTION: It will detect the voltage when it drops below 160 volt and send SMS to 4 people regarding this incident