Ramping Down the variable in Arduino IDE with the help of millis()??......

Projects Programming
4

Or a boolean, like:

boolean RampingUp = true;


double setpoint_value_Ramp_Hold_Dump()
{
  static unsigned long start_millis = 0;
  unsigned long current_millis;
  const unsigned long hold_1 = 1000;
  current_millis = millis();
  if (current_millis - start_millis >= hold_1)
  {
    startMillis += hold_1;
    if (RampingUp)
    {
      setpoint += 0.1;
      if (setpoint > 3.3)
      {
        setpoint = 3.3;
        RampingUp = false;
      }
    }
    else  // not RampingUp
    {
      setpoint -= 0.1;
      if (setpoint < 0.0)
      {
        setpoint = 0.0;
        RampingUp = true;
      }
    }
  }