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Link: http://codepad.org/hYymiuLd    [ raw code | output | fork ]

C, pasted on Oct 11:
unsigned long ref_tensao[21]={50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250};
unsigned long ref_ad_tensao[21]={38, 55, 74, 95, 119, 144, 171, 200, 230, 262, 296, 330, 366, 404, 442, 480, 520, 558, 604, 646, 692};

float calcula_tensao(unsigned long entrada){
	float tensao;
	unsigned long x1, x2, y1, y2, dx, dy, temp;
	unsigned char i;
	if ((entrada<ref_ad_tensao[0])||(entrada>ref_ad_tensao[20])){
		tensao=0;
	}else{
		i=0;
		while(entrada>ref_ad_tensao[i+1]){
                        i++;
		}
		x2=ref_ad_tensao[i+1];
		x1=ref_ad_tensao[i];
		y2=ref_tensao[i+1];
		y1=ref_tensao[i];
		dx=x2-x1;
		dy=y2-y1;
		temp=(dy*(entrada-x1))+(dx*y1);
		tensao=(float)temp/dx;
	}
	return tensao;
}

int main(){
	float resultado;
	resultado = calcula_tensao(695);
	printf("%f",resultado);
	return 0;
}


Output:
1
0.000000


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