Liquid Drop Speed Measurement System

You can just use below parts to build a low-cost and simple liquid drop speed measurement system which is suitable for the areas such as works, hospital.
It uses DC 5V to work. When there is no liquid in the infrared area, the buzzer will alarm and when there is liquid in the infrared area, the buzzer will not alarm. The LCD 1602 can display the drops of liquid every 10 second. You can set the drops of liquid every 10 second for reference.

1.Arduino Atmega328P UNO R3 Dev. Board
2.830 Point Solderless PCB Bread Board MB-102 Test DIY
3.5mm Infrared Emitting LED
4.TL1838 VS1838B VS1838 Universal Receiving Head
5.Active Buzzer Module for Arduino
6.65pcs Breadboard Plug Wire Cable Tire
7.12X12X5mm Tact Switches 4 Legs
8.100pcs 1K ohm 1/4W 1% Accuracy Metal Film Resistor
9.+5V DC power supply
10.1602A HD44780 Character LCD Display Module LCM Blue Backlight

Functions

1)After the initialization of hardware, the LCD1602 will display the pre-set interface.
2)When there is no liquid in the infrared area, the buzzer will alarm and the LCD1602 will display the N on the YN column.
3)When there is liquid in the infrared area, the buzzer will not alarm and the LCD1602 will display the Y on the YN column. And if there is a drop of liquid, the display of LCD1602 will add one.
4)You can set the drops of liquid every 10 second by tow buttons.

More details can be found at: http://www.instructables.com/id/Liquid-Drop-Speed-Measurement-System-Based-On-Ardu/