Tuesday, October 02, 2012

Low Cost Air Quality Sensor module

DT-SENSE SENSOR AIR QUALITY is a sensor module that can be used to determine the concentration levels of harmful gases in the air. This module is based sensor MQ-135, which is a sensor that can detect ammonia gas, benzene, alcohol, and other dangerous gases. This module is suitable for use in the process of determining air quality (air quality control).

DT-SENSE SENSOR AIR QUALITY designed using high quality SMD components to be used in applications that require reliable performance and minimal space requirements. At the interface, there are two choices for the user that the TTL UART baud rate of 38,400 bps or I2C that allows modules to be cascaded up to 8 pieces.


  • Working voltage: 5 VDC.
  • Target gases: ammonia (NH3), nitrogen oxides (NOx), alcohol, benzene, smoke, carbon dioxide (CO2), etc..
  • Detection range: 10 ppm - 300 ppm ammonia, 10 ppm - 1000 ppm benzene, 10 ppm - 300 ppm alcohol.
  • interface:
  • UART TTL: 38 400 bps, 8-bit data, 1-stop bit, no parity, no flow control.
  • I2C: can be cascaded up to 8 pieces of modules in a single communication line.
  • Using a 10-bit ADC to convert analog data from the sensor.
  • Has an output in the form of digital data with a value of 0-1023 (ADC conversion result).
  • There is 1 piece variable resistor for setting the threshold value manually.
  • Provided some jumpers for I2C pull-up configuration, the load resistor and variable resistor threshold.
  • It has a remote control feature on / off with two working modes and choices of hysterisis window.
  • Pin I / O voltage levels are compatible with TTL and CMOS.
  • It features 2 LED indicators.
  • Equipped with a series of EMI filters to reduce electromagnetic interference.
  • Compatible with gas sensors:
  • MQ-3 (alcohol).
  • MQ-4 (methane).
  • MQ-6 (LPG).
  • MQ-7 (carbon monoxide).
  • MQ-135 (air quality).
  • MG-811 (carbon dioxide).
  • Dimensions: 5.6 cm  x 4 cm x 3.4 cm