Arduino code for automatic water level controller

I am building an arduino uno based water level controller. The hardware part is ok but the code is not functioning well as intended. I have uploaded an image of the controller and the buggy source code as well. In the image, it can be seen that there are four push buttons just below the LCD. I use them to enter the settings for upper water level and lower water level. LCD backlight is controlled using a transistor. The code is intended to do the following: * The water_receive receives distance as integer values from water_send. Each distance is punctuated by a new line. * If water level in tank falls below lower water level setting, motor is switched on. Buzzer is turned on for 3 seconds. LCD displays "MOTOR TURNED ON" for five seconds. Then "MOTOR RUNNING" is displayed until motor is turned off. * When water level in tank reach the upper water level setting, Motor is switched off. Buzzer is turned on for 3 seconds. LCD displays " TANK IS FULL" for two seconds. Then "MOTOR TURNED OFF" for 2 seconds. Then it should display" WATER LEVEL IN TANK IS XYZ % . This should be the default display. *To enter settings for upper and lower water level, the first two button is pressed simultaneously and hold for 2 seconds. Once it enter into setting mode,LCD should display "SET UPPER WATER LEVEL" in Centimeter. first button will be used to increment value. second button will be used to decrement value. Third button will be used to set the value and go to lower water level setting. Then LCD should display” SET LOWER WATER LEVEL” . When the third button is pressed after the setting, the lower water level is set and the display should return to default. *If motor is running and 5 minutes has elapsed, but there is no increase in water level in the tank, then motor should be turned off. Buzzer should beep for one minute. And LCD should display” NO WATER IN SUMP/MOTOR FAULTY” . It should remain in this state until the fourth button is pressed manually. This is added as a safety feature to prevent dry run of the motor. Setting for the 5 minutes time interval can be entered by pressing the first and fourth button for 2 seconds. LCD should display “ SET MOTOR FAULTY RUN TIME” during setting. First and second button to increment and decrement in minutes. Third button for OK. *The fourth button will be used to manually turn on the motor. If the fourth button is pressed and water level in tank is below upper level, motor should turn on until water level reach upper water level. *LCD backlight is controlled using a transistor. By default it should remain in OFF mode. LCD back light should Glow for 10 seconds when any of the four button is pressed. /*Notes*/ *The code which i have attached is almost self explanatory. While writing your Code, Use the same pins which i have used because thats how the electronic circuit has been built. *You are required to write the water_receive code. *Please avoid Delay(). Use Millis() instead *Comment the code adequately *I need the arduino source code file