//#define PID_DEBUG // Sends debug data to the serial port. Use 'M303 D' to toggle activation.
//#define PID_OPENLOOP // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
//#define SLOW_PWM_HEATERS // PWM with very low frequency (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
#define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
#define PID_FUNCTIONAL_RANGE 20 // If the temperature difference between the target temperature and the actual temperature
// is more than PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.