Analog pH Meter (pH Sensor) เป็นเซ็นเซอร์สำหรับวัดความเป็น กรด-เบส ของสารละลายโดยค่าที่วัดได้จะอยู่ในช่วง 0 - 14pH output เป็นแบบ Analog (0-1023) ใช้ไฟเลี้ยง 5V 

SPECIFICATION

Module Power : 5.00V

Module Size : 43 x 32mm

Measuring Range :0 - 14pH

Measuring Temperature: 0 - 60 ℃

Accuracy : ± 0.1pH (25 ℃)

Response Time : ≤ 1min

pH Sensor with BNC Connector

pH2.0 Interface ( 3 foot patch )

Gain Adjustment Potentiometer

Power Indicator LED

ข้อมูลเพิ่มเติม

โปรแกรมตัวอย่าง

/*
 # This sample code is used to test the pH meter V1.0.
# Editor : YouYou
# Ver  : 1.0
# Product: analog pH meter
# SKU  : SEN0161
*/
#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 = 3.5*voltage+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;imax
max=arr[i];
}else{
amount+=arr[i]; //min<=arr<=max
}
}//if
}//for
avg = (double)amount/(number-2);
}//if
return avg;
}