Requirement

Hello guys welcome to my blog so in this tutorial we will learn to make a Simulink model which controls water pump and alarm according to water level and for that we will keep in mind some conditions as given below:

  • Pump ON Condition – If water level is < 20%, then pump will turn ON. It will stay on until it is turned OFF manually or logically.
  • Pump OFF Condition – If water level is > 95%, then pump will turn OFF.
  • Alarm Condition – Alarm will turn ON only when water level is between 90% and 91%.

Logic Design

Pump Set

Alarm Status

  • So here you can see that the water level input is compared with thresholds (20% and 95%) using relational operators.
  • For Pump Control we added two condition as shown below.
    • < 20% → Pump_ON signal set.
    • > 95% → Pump_OFF signal set.
    • Here pump status is maintained using logical gates to ensure whether it is ON until the OFF condition is met.
  • For Alarm Control we added two condition as shown below.
    • So here Alarm will turns ON only if water level ≥ 90% and ≤ 91%.
    • Logical AND block ensures both conditions are met simultaneously.

Graph Explanation

  • Water Level Plot: It shows the water filling from below 20% to above 95%.
  • Pump Status Plot: Pump turns ON when water level is below 20% and turns OFF when it crosses 95%.
  • Alarm Status Plot: Alarm activates only in the narrow band between 90% and 91% water level, then turns OFF.

Result

The simulation results match with the requirement:

  • So here pump starts at water level < 20% and stops when water level reach > 95%.
  • Alarm activates only when water level is between 90% and 91%.