i have a project and i want to help me please . its automatic water level by arduino .

the idea is :

if the water goes to the bottom of water , the pump operates untill the water goes to the maximum level . if any one approach to to the valve , the valve will open and allow to water to flow .

tools :

tank

electric valve ( normally closed )

two ultrasonic ( one for measure level of water and another if any one appraoch to the valve )

dc pump

arduino uno

and relay

i want help in programming