Sensor 傳回比較的問題?
目的：由電壓及電流讀取值；然後換算為功率(P=I*V),程序碼如下~
問題：sensor 回傳的值沒問題；換算丟入P0&Pn 值沒問題<==serial monitor 觀查皆正確。
執行上卻沒有辦法得到if 判斷條件(因為P0&Pn改變皆是同時的)後執行PWM+-結果.請教各位大神，幫忙檢視程式碼那裡寫錯了…謝謝
========Code================================
float P0 = 0;
float Pn = 0;
int pwm=9; // pwm output to mosfet
void setup()
{
TCCR1B = TCCR1B & 0b11111000 | 0x01; // setting prescaar for31.372KHz pwm
Serial.begin(9600); // Openserial communications and wait for port to open:
pinMode(pwm,OUTPUT);
}
void loop()
{
int P[5],i,d;
float pwm_d=0;
intsensor1 =analogRead(0);
intsensor2 =analogRead(1);
float Solar_volt = sensor1*25/1024;
float Solar_curr = 0.0488281*sensor2-25;
analogWrite(pwm,127); //set 50%Duty ration for MOSFET switch
Serial.print("Duty ratio is 50%");
P0= Solar_volt*Solar_curr; //read P0
for(i=0;i<5;i++)
{
P=P0;
if (P!=P0)
{
Pn=P;
break;
}
}
while(P0<Pn)
{
for(d=127;d<=179;d++)
analogWrite(pwm,d);
delay(100);
if(P0 == Pn)
{
analogWrite(pwm,d);
pwm_d=d/256*100;
Serial.print("Duty ratio is=/n");
Serial.println(pwm_d);
Serial.print(P0);
Serial.print(Pn);
break;
}
}
while(P0>Pn)
{
for(d=179;d<=0;d++)
analogWrite(pwm,d);
delay(100);
if(P0 == Pn)
{
analogWrite(pwm,d);
pwm_d=d/256*100;
Serial.print("Duty ratio is=/n");
Serial.println(pwm_d);
Serial.print(P0);
Serial.print(Pn);
break;
}
}
delay(1000);
}
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