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    tantt2810

    @tantt2810

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    Best posts made by tantt2810

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    Latest posts made by tantt2810

    • RE: Air Quality Sensor

      Hi all,

      I have my library for reading sensor. It is open source and its name is OpenSensor. I think that it's useful for every body.

      Besides, I have my a monitoring system in real time using Arduino, MQ2, MQ135, MG811, GP2Y10 sensors and shield wifi ESP8266. It use OpenSensor library to read value from sensor and push it to database of WebServer by ESP826.

      This is link: https://github.com/tantt2810

      Hoping it helpful for all,

      Good job,

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      Hello,

      Can I use pinMode(digitalpin, OUTPUT) to turn off sensor? Or Is there any way to wirte a function that turn off sensor?

      I want to remote it on web to turn on or off it.

      Thank you so much !!!

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      @epierre
      Thanks you so much !!! Good job, Good boy =)).

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      @epierre
      Thank you. Your mean is Vcc->5V, GND->GND, Dout->Digital pin, Aout->Analog pin. Is it right?
      But I don't know the tcm pin connect with ? I have read datasheet but I don't find any info about tcm pin. Please help me. Thank you so much !!!

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      Hi everyone,
      I have an CO2 MG811 sensor. I don't know where tcm pin connect with ?
      Please help me. Thank you so much !!!!
      0_1457101257425_F08406-CO2-Carbon-Dioxide-Sensor-Module-font-b-MG811-b-font-Voltage-0-2V-Voltage-Output.jpg

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      Hello,
      I have read the sensitivity characteristics curve in datasheet of MQ135 and I don't know AL R, 3/4, 1/4* and +- mean? Can you help me, please !!!
      NH4 represent for NH3, doesn't it ?
      Thank you so much !!!

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      @epierre Hi you,
      I think the Rs/Ro is not RL. In the datasheet RL=5kOhm. As I know it is a resistance on board Arduino, and we set it 5kOhm. Is it right? I also don't know why we set it equal 5kOhm. =))
      And why 20000 is in "float Rs = 20000 * ( 5.00 - Vrl) / Vrl ; // Ohm" ?
      Please help me clearly. Thank you so much !!!

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      Hello,
      I'm don't understand the recipe below. Why RL_Value(Load Resistance)(1023-raw_adc)/raw_adc)? Can you explain for me?
      Thank you so much !!!
      /
      ***************** MQResistanceCalculation ****************************************
      Input: raw_adc - raw value read from adc, which represents the voltage
      Output: the calculated sensor resistance
      Remarks: The sensor and the load resistor forms a voltage divider. Given the voltage
      across the load resistor and its resistance, the resistance of the sensor
      could be derived.
      ***********************************************************************************/
      float MQ2::MQResistanceCalculation(int raw_adc)
      {
      return ( ((float)RL_VALUE
      (1023-raw_adc)/raw_adc));
      }

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      @epierre Thank you so much !!!
      Have a nice day =)) !!!

      posted in Hardware
      tantt2810
      tantt2810
    • RE: Air Quality Sensor

      Hello,
      I don't know how to calculate 3 numbers of LPGCurve[]. Can you explain clearly for me? Thank you so much !!!

      0_1456336543192_Capture.PNG

      posted in Hardware
      tantt2810
      tantt2810