badxhabit

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• Arduino Parts

  @badxhabit started

  • 5 comments
  • 3,808 views

  @d0773d replied
• Arduino Parts

  in Interfacing • 9 years, 10 months

  

  Hi,

  So I just received my pH Meter and shield from df, however, I am running into a little trouble converting the library to JS. I have taken the Arduino code from here[http://www.dfrobot.com/wiki/index.php/PH­_meter(SKU:_SEN0161)], but I can't seem to find an equivalent to "millis();". Is there a way around this? Am I even going in the right direction?

  Thanks.

  
  function SEN0161(pin) {
    this.pin = pin;
  }
  
  SEN0161.prototype.getScale = function () {
    pin = this.pin;
    var val = digitalRead(pin);
    
    var Offset = 0.00;
    var LED = 13;
    var samplingInterval = 20;
    var printInterval = 800;
    var ArrayLength = 40;
    
    var pHArray = [ArrayLength];
    var pHArrayIndex = 0;
    var samplingTime = '';
    
    var printTime = Date.now();
    var pHValue,voltage;
    
    //console.log(Date.now());
    //console.log(digitalPulse(this.pin,1,5)­);
  
    if(Date.now() - samplingTime > samplingInterval) {
        pHArray[pHArrayIndex++] = analogRead(this.pin);
      
        if(pHArrayIndex == ArrayLenth)pHArrayIndex=0;
      
        voltage = this.averageArray(pHArray, ArrayLength) * 5.0 / 1024;
        pHValue = 3.5 * voltage + Offset;
        samplingTime = Date.now();
    }
    if(Date.now() - printTime > printInterval) {
          console.log("Voltage:");
          console.log(voltage,2);
          console.log("    pH value: ");
          console.log(pHValue,2);
          digitalWrite(LED,digitalRead(LED)^1);
          printTime = Date.now();
    }
  };
  
  SEN0161.prototype.averageArray = function (arr, number) {
    var i;
    var max,min;
    var avg;
    var amount=0;
  
    if(number <= 0){
      console.log("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[i];
      }
      avg = amount/number;
      return avg;
    } else {
      console.log(arr);
      if(arr[0] < arr[1]) {
        min = arr[0]; max=arr[1];
      } else {
        min=arr[1];
        max=arr[0];
      }
      console.log(min);
      console.log(max);
      for(i=2; i < number; i++) {
        if(arr[i] < min) {
          amount += min;        //arr<min
          min = arr[i];
        } else {
          if(arr[i] > max) {
            amount += max;    //arr>max
            max = arr[i];
          } else {
            amount += arr[i]; //min<=arr<=max
          }
        }
      }
      avg = amount/(number-2);
    }
    return avg;
  };
  
  exports.connect = function (pin) {
    return new SEN0161(pin);
  };
  
  //exports.connect();
  
  
  var sensor = exports.connect(A1);
  console.log(sensor);
  //console.log(sensor.getScale());
  setInterval('sensor.getScale()', 1000);
  

• Arduino Parts

  in Interfacing • 9 years, 11 months

  

  Hey,

  I'm about to finally start a project with my Espruino chip, but had a question regarding parts. I wanted to add a pH probe but all I could find are ones that are Arduino Library ready.

  Will this pH probe work my Espruino chip? If not, where can I buy the Espruino specialty parts?

  Thanks!