mics2714 ADC to ppm (?)
Lorenzo.Barale 2023-06-28 12:45:43 289 Views5 Replies I am using the mics2714 breakout sensor (sen0441) with arduino uno. I am using this code, which is provided by the official website:
/*!
* @file getGasPPM.ino
* @brief Reading Gas concentration, A concentration of one part per million (PPM).
* @n When using IIC device, select I2C address, set the dialing switch A0, A1 (Address_0 is [0 0]), (Address_1 is [1 0]), (Address_2 is [0 1]), (Address_3 is [1 1]).
* @n When using the Breakout version, connect the adcPin and PowerPin
* @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com)
* @licence The MIT License (MIT)
* @author ZhixinLiu([email protected])
* @version V1.1
* @date 2021-04-19
* @get from https://www.dfrobot.com
* @url https://github.com/dfrobot/DFRobot_MICS
*/
#include "DFRobot_MICS.h"
#define CALIBRATION_TIME 3 // Default calibration time is three minutes
// When using the Breakout version, use the following program to construct an object from DFRobot_MICS_ADC
/**!
adcPin is A0~A5
powerPin is General IO
*/
#define ADC_PIN A0
#define POWER_PIN 10
DFRobot_MICS_ADC mics(/*adcPin*/ADC_PIN, /*powerPin*/POWER_PIN);
void setup()
{
Serial.begin(115200);
while(!Serial);
while(!mics.begin()){
Serial.println("NO Deivces !");
delay(1000);
} Serial.println("Device connected successfully !");
/**!
Gets the power mode of the sensor
The sensor is in sleep mode when power is on,so it needs to wake up the sensor.
The data obtained in sleep mode is wrong
*/
uint8_t mode = mics.getPowerState();
if(mode == SLEEP_MODE){
mics.wakeUpMode();
Serial.println("wake up sensor success!");
}else{
Serial.println("The sensor is wake up mode");
}
/**!
Do not touch the sensor probe when preheating the sensor.
Place the sensor in clean air.
The default calibration time is 3 minutes.
*/
while(!mics.warmUpTime(CALIBRATION_TIME)){
Serial.println("Please wait until the warm-up time is over!");
delay(1000);
}
}
void loop()
{
/**!
Gas type:
MICS-4514 You can get all gas concentration
MICS-5524 You can get the concentration of CH4, C2H5OH, H2, NH3, CO
MICS-2714 You can get the concentration of NO2
Methane (CH4) (1000 - 25000)PPM
Ethanol (C2H5OH) (10 - 500)PPM
Hydrogen (H2) (1 - 1000)PPM
Ammonia (NH3) (1 - 500)PPM
Carbon Monoxide (CO) (1 - 1000)PPM
Nitrogen Dioxide (NO2) (0.1 - 10)PPM
*/
float gasdata = mics.getGasData(NO2);
Serial.print(gasdata,1);
Serial.println(" PPM");
delay(1000);
//mics.sleepMode();
}
The problem is that I am always getting 0.2 ppm as result in the serial monitor. With the shown code do I get the ppm concentration of NO2 or I need to use the mics.getADCData(RED_MODE) function to convert ADC to ppm? Thank you very much
Hello,
According to the comment section of the code, the reading is within the range of detection. You could maybe try testing in an environment with higher concentration, possibly near a car's gas exhaust, and see if the result changes.
Best regards,
xingzhao.zhu Even if I put the sensor next to a car exhaust I still get 0.2 ppm constant. Could be the sensor broken? Thank you
Okay, we will test one of our sensors during the weekend and get back to you with our results on Monday, thank you for your understanding.
We tested this product next to the car exhaust. It has an output of 2-3 ppm. The output is close to 0 ppm when there is no car exhaust.
