[l0=427] // unsigned int; light intensity reading through 1 cm path of medium 
[OD_IPTG=0.7]	  	  //float 
[OD_MAX=4] 		  //float
[PH_MIN=7.0]
[PH_MAX=7.4]
[PH_A=0.0335768807] 	  // float;  linear regresion ph sensor calibration curve: ph_instant = PH_A * ph_adc +PH_B
[PH_B=-5.9885198198]
[OH_FLOW=438] 		  //unsigned int;  438 uL/s, pump constant.
[OH_DROP_VOLUME=20] 	  //unsigned int;  uL 5N NaOH
[OH_ON_OFF_MILISEC=60000] //unsigned int 
[HARVEST_MINUTES=10] 	  //unsigned char 
[MIN_GROWING_MINUTES=2]   //unsigned char  
[MIN_IPTG_MINUTES=2] 	  //unsigned char  
[IPTG_PUMPING_SECONDS=60] //unsigned int  
[SD_LOG_FREQ_SEC=600] 	  //unsigned int