Project paper - The Department of Physics and Astronomy

misc varsi n t f l a g = 0 , o l d f l a g = 0 , count = 0 ;unsigned long time , t1 ;double f r e q =0;// runs at r e s e tvoid s e t u p ( ) {// high output r a t e ( bps )S e r i a l . b e g i n ( 5 0 0 0 0 0 ) ;pinMode ( motor1 , OUTPUT) ;pinMode ( motor2 , OUTPUT) ;}void l o o p ( ) {d i g i t a l W r i t e ( motor1 , HIGH ) ; // s t a r t one motori n t s e n s o r V a l u e = analogRead (A0 ) ; // read analog pin 0// save o l d v a l u e f o r comparisono l d f l a g = f l a g ;// check i f c r o s s e si f ( s e n s o r V a l u e > t h r e s h o l d )f l a g = 1 ;e l s ef l a g = 0 ;// 9 f l a g s 4 w a v e l e n g h t si f ( f l a g != o l d f l a g ){i f ( count == 0){time = m i c r o s ( ) ;count++;}e l s e i f ( count == 8){t1 = m i c r o s ()− time ;f r e q = 240000000.0/(( double ) t1 ) ;S e r i a l . p r i n t l n ( f r e q ) ;count = 0 ;}e l s e{count++;}}// sendPlotData (” v o l t a g e ” , sensorValue ) ;16