how can i get ph meter variable and use later for alarming system via gms, led ,sound, exc.
/*
This sample code is used to test the pH meter Pro V1.0.
Editor : YouYou
Ver : 1.0
Product: analog pH meter Pro
SKU : SEN0169
/
#define SensorPin A0 //pH meter Analog output to Arduino Analog Input 0
#define Offset 0.00 //deviation compensate
#define LED 13
#define samplingInterval 20
#define printInterval 800
#define ArrayLenth 40 //times of collection
int pHArray[ArrayLenth]; //Store the average value of the sensor feedback
int pHArrayIndex=0;
void setup(void)
{
pinMode(LED,OUTPUT);
Serial.begin(9600);
Serial.println("pH meter experiment!"); //Test the serial monitor
}
void loop(void)
{
static unsigned long samplingTime = millis();
static unsigned long printTime = millis();
static float pHValue,voltage;
if(millis()-samplingTime > samplingInterval)
{
pHArray[pHArrayIndex++]=analogRead(SensorPin);
if(pHArrayIndex==ArrayLenth)pHArrayIndex=0;
voltage = avergearray(pHArray, ArrayLenth)5.0/1024;
pHValue = 3.5voltage+Offset;
samplingTime=millis();
}
if(millis() - printTime > printInterval) //Every 800 milliseconds, print a numerical, convert the state of the LED indicator
{
Serial.print("Voltage:");
Serial.print(voltage,2);
Serial.print(" pH value: ");
Serial.println(pHValue,2);
digitalWrite(LED,digitalRead(LED)^1);
printTime=millis();
}
}
double avergearray(int arr, int number){
int i;
int max,min;
double avg;
long amount=0;
if(number<=0){
Serial.println("Error number for the array to avraging!/n");
return 0;
}
if(number<5){ //less than 5, calculated directly statistics
for(i=0;i<number;i++){
amount+=arr*;*
- }*
- avg = amount/number;*
- return avg;*
- }else{*
- if(arr[0]<arr[1]){*
- min = arr[0];max=arr[1];*
- }*
- else{*
- min=arr[1];max=arr[0];*
- }*
- for(i=2;i<number;i++){*
_ if(arr*<min){_
_ amount+=min; //arr<min*_
_ min=arr*;
}else {
if(arr>max){
amount+=max; //arr>max*
max=arr*;
}else{
amount+=arr; //min<=arr<=max*
* }
}//if*
* }//for*
* avg = (double)amount/(number-2);
}//if*
* return avg;
}*_