Week - 4

Challenge: Week 4

1. Control logic of a washing machine:

Objective:

• If power supply is available --> system gets activated
• If water is not available --> stop process --> indicate through LED
• Soaking time --> 200s, Washing time -->100s
• Rinsing time --> 20s, Drying time -->50s
• After process is completed --> turn FINISHED LED on.

Logic:

Stateflow: State-flow provides a graphical language that includes state transition diagram, flowcharts, transition tables and truth tables.

Stateflow:

• Start
• Soak-->0 - 200 seconds (200)
• Wash-->200 - 300 seconds (100)
• Rinse-->300 - 320 seconds (20)
• Dry-->320 - 370 seconds (50)
• Finish

Total process run time:370 seconds. The model stop time is set to 1000 seconds

Simulink model:

Stateflow/Control logic:

Explanation:

• The stateflow of the machine is set in the chart of the model
• Toggle switches are provided to turn the water and power ON and OFF.
• The system is set such that both power and water is required to complete the process.
• The state timings for soak, wash, rinse and dry are defined in the chart and once all the process are completed, a lamp will flash with the wash complete signal.
• If the water supply is not available, the process will be terminated.

Result:

Power OFF, water OFF

Power ON, water ON

Simulink blocks used:

1. Slider switch
2. Constant block
3. Chart
4. Lamps
5. Display block