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thanks for the help. your code worked. I need 4 functions to be running in a series that would run every 200mSec. the 4 functions may call 3 to 4 sub functions. Can I use millis for it. example as done on pic

void loop(){
do{
        while(!flag_200ms);      // wait until 200mS has passed
        flag_200ms = 0;           // reset the 0.2 Second flag
      
        power_calc();           // Run Voltage, Current and Wattage Calculations

          //***LCD Line 2 ***//
          display_amphour(2, 1, aH);     // Remaining Battery Capacity
          batt_percNbar();                       // Calculate & Display Battery Percentage/Bar
          if(charging_flag){
            display_TimeRemaining();      // Charge-Discharge Time Remaining ///
          }
          else{
             speed_calc();
          }
}while(1);
}