hi , i'm trying to make a code that converts an analogue value into an angle in degree's,using given values for an angle with its corresponding voltage. i keep getting -1 one as my answer regardless of what i set my input voltage to be. please help.thanks in advance
Code:int conversion_select(float voltage){ int select; if(0.780<voltage<=0.800) select =0; else if(0.8<voltage<=0.845) select =1; else if(0.845<voltage<=1) select =2; else if(1<voltage<=1.69) select =3; else select =4; return select; } /* * Convert_to_degree() - converts the analogue value into degree's * */ float Convert_to_degree(int A_value){ float voltage[10]={0.78,0.8,0.845,0.920,1,1.13,1.26,1.42,1.55,1.69}; float Angle[10]={0,10,20,30,40,50,60,70,80,90}; float degree,gradient,input_voltage; int select; input_voltage = (float)(A_value - 6)/(float)(115) ; select = conversion_select(input_voltage) ; delay(20000); printf("%f",input_voltage); switch(select){ case 0: { gradient=(float)(Angle[1]-Angle[0])/(float)(voltage[1]-voltage[0]); degree = gradient*(input_voltage-voltage[0])+Angle[0]; } case 1: { gradient=(float)(Angle[2]-Angle[1])/(float)(voltage[2]-voltage[1]); degree = gradient*(input_voltage-voltage[1])+Angle[1]; } case 2: { gradient=(float)(Angle[4]-Angle[2])/(float)(voltage[4]-voltage[2]); degree = gradient*(input_voltage-voltage[2])+Angle[2]; } case 3: { gradient=(float)(Angle[9]-Angle[4])/(float)(voltage[9]-voltage[4]); degree = gradient*(input_voltage-voltage[4])+Angle[4]; } case 4: degree = -1; } return degree ; }
