Main concept for STM.

There are 2 timers -  TIM 2, and TIM4. Period of TIM2 approximately 0.5ms, period of TIM4 approximately 0.25ms. TIM 2 is using for controling MOSFETS, obtaining parameters ( flow status, wet status, oil level) and status updating. TIM4  is using for indicating ( green - red led). 

Period of led indicating is 5 TIM4. 

       0          1            2           3         4          
        |250мс|250мс|250мс|250мс|250мс|
       ------------------------------------------------------
        |||||||||||||||            |||||||||||||||||     

Thereis 7 status mode: 

• max oil ( its normal state)
• medium oil ( its normal state)
• a little oil ( its normal state)
• flow state ( it is special state)
• no current state ( its not normal state)
• overcurrent state ( its not normal state)
• start state ( first run)

so green-red led has different flashing modes with different states.