![]() ![]() This output voltage is converted to a digital value (0-1023) via the analog to digital converter in Arduino. Under standard conditions, this output voltage from the sensor is directly proportional to the concentration of CO2 gas in PPM. The analog output voltage lies between 0-5V where the output voltage increases relatively with the concentration of gas vapors coming in contact with the sensor. MQ-135 gas sensor module features both analog output fetched from its AO pin and digital output fetched from its DO pin. Choosing a good value for the load-resistor is only valid after the burn-in time MQ-135 Gas Sensor Module Overview If the sensor is used to measure any gas (like in a air quality detector) the load-resistor could be set for a value of about 1V output with clean air. If only one specific gas is measured, the load-resistor can be calibrated by applying a known concentration of that gas. The higher the value, the less accurate is sensor for higher concentrations of gas. The lower the value, the less sensitive is the sensor. The sensor needs a load-resistor at the output to ground. ![]() Using potentiometer on chip we can control the turning OFF point of digital pin at some value of analog pin. When gas is present, digital output is 0 and analog output is much less than 1023. Input values are not changing: Check the preset connections.When no gas is present, digital output is 1 and analog output gives 1023 max value. Try rotating preset and see the effect on the LED and serial monitor. LED brightness is adjusted as per the analog input value. The analog input is printed on the serial monitor. const int analog_ip = A2 //Naming analog input pin const int LED = 3 //Naming LED Pin int inputVal = 0 //Variable to store analog input values void setup ( ) 4. You may download this code (Arduino Sketch) from here. Thus mapping is done by dividing input values by 4. ![]() In this example an analog input is taken and it displayed on an LED and the serial monitor.In order to show the input result on LED, Mapping of input value is need. Arduino Nano has 10 bit ADC which means it scales an analog signal in a range of 0-1023. ![]() To read an analog signal through Arduino Nano, Analog to Digital conversion is required. This tutorial teaches how to take analog input using Arduino Nano. This tutorial of Robo India explains the basics of input and output programming in physical computing world. ![]()
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