/* # This sample codes is for testing the pH meter V1.0. # Editor : YouYou # Date : 2013.10.12 # Ver : 0.1 # Product: pH meter # SKU : SEN0161 */ #define SensorPin 0 //pH meter Analog output to Arduino Analog Input 0 unsigned long int avgValue; //Store the average value of the sensor feedback float b; int buf[10],temp; void setup() { pinMode(13,OUTPUT); Serial.begin(9600); Serial.println("Ready"); //Test the serial monitor } void loop() { for(int i=0;i<10;i++) //Get 10 sample value from the sensor for smooth the value { buf[i]=analogRead(SensorPin); delay(10); } for(int i=0;i<9;i++) //sort the analog from small to large { for(int j=i+1;j<10;j++) { if(buf[i]>buf[j]) { temp=buf[i]; buf[i]=buf[j]; buf[j]=temp; } } } avgValue=0; for(int i=2;i<8;i++) //take the average value of 6 center sample avgValue+=buf[i]; float phValue=(float)avgValue*5.0/1024/6; //convert the analog into millivolt phValue=3.5*phValue; //convert the millivolt into pH value Serial.print(" pH:"); Serial.print(phValue,2); Serial.println(" "); digitalWrite(13, HIGH); delay(800); digitalWrite(13, LOW); }