Week - 4

1. Washing Machine Control logic:

• In the Control logic in State flow, the states are activated only when Power == 1 and the Water supply == 1. This ensures that the machine is not started without the power supply and water. (Refer attachment: Washing machine_Stateflow.jpg) 
• If the water supply is not available, the LED indicator is turned ON (Set to RED) in the 'exit' action in the Initialize state.
• Switch from Soaking time to Washing time is set by the transition command (after (200, sec))
• Similarly Washing to Rinsing state transition is set as after (100,sec), Rinsing to Drying state transition as after (20, sec), Drying to Finish state transition as after (50,sec). 
• After completion of washing, the Finish_wash is set to TRUE and accordingly the Finish washing LED is turned ON (Set to GREEN). (Refer attachment: Washing machine_Block diagram.jpg)

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2. Gear shift logic:

• In the control logic in State flow, Start state is initialized that if the Speed==0, then the engine is considered to be stopped. Hence engine_stopped is initialized to TRUE. LED indicator glows RED. (Refer attachment: Gear Shift_Block diagram.jpg)
• Once the Speed is increased via the Slider, transition from Start state to 1st gear state happens. This is checked using the transition condition (Speed>0 && Speed <=15). Similarly it is considered for the transition from
  • 1st gear to 2nd gear as (Speed>=16 && Speed <=25)
  • 2nd gear to 3rd gear as (Speed>=26 && Speed <=40)
  • 3rd gear to 4th gear as (Speed>=41 && Speed <= 60)
  • 4th gear to 5th gear as (Speed>61)
• Once the Speed is decreased via the Slider, the reverse happens i.e the current gear should be reduced to the low speed gear (i.e 1 step gear reduction). For this the below logic is used
  • From 5th gear if the speed reduces, (Speed<61) tranisition condition will cause the transition to 4th gear state
  • Similarly, from 4th gear to 3rd gear (Speed<41)
  • For 3rd gear to 2nd gear (Speed<26)
  • For 2nd gear to 1st gear (Speed<16). (Refer attachment: Gear Shift_Stateflow.jpg)
• Gear number is changed along with the increasing and decreasing gear transition state. Current gear number is displayed in the 'Display' dashboard.