Joy-it SEN-MQ135-V2 Handleiding
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MQ-135 AIR QUALITY & HARMFUL GAS SENSOR BOARD
WITH ANALOG AND DIGITAL OUTPUT
Detects benzene, ammonia, sulfide, smoke, nitrogen
oxides, and other air pollutants
Measurement range of approximately 10 to 1,000 ppm
Analog output (0–5 V) for continuous gas concentration
monitoring
Digital threshold output with adjustable trigger via on-
board potentiometer
Operates from a standard 5 V DC supply with integrated
heater circuit
SPECIAL FEATURES
The MQ-135 gas sensor board is a semiconductor-
based sensing module designed for the detection
of various harmful gases and general air pollution.
The sensor responds to benzene, ammonia, sulfide
compounds, nitrogen oxides, smoke, and other air
contaminants, making it suitable for air quality
monitoring, environmental measurement systems,
and safety-related applications. The typical
detection range extends from 10 to 1,000 ppm.
The module operates from a 5 V DC supply and
integrates the required heater circuitry for stable
sensor operation. Gas concentration is evaluated
via an analog voltage output in the range of 0 to 5
V, derived from the change in sensing resistance. In
addition, a digital output is provided via an onboard
comparator with an adjustable threshold, allowing
direct use in alarm or switching applications
without external signal conditioning.
Aer each power-up, the sensor requires a heat-
up time of approximately 10 to 15 minutes before
reliable measurements can be obtained. For initial
commissioning, a burn-in period of 48 to 168
hours of continuous operation is recommended to
stabilize the sensing element. Following this period,
a baseline resistance measurement in clean air
should be recorded as a reference value. If the sensor
has been powered o for several weeks or longer,
repeating the burn-in and baseline procedure is
advised to maintain measurement consistency.
The board is equipped with power and status LEDs
for visual indication of operation and detection
status. For mechanical and layout flexibility, the
LEDs may alternatively be soldered on the opposite
side of the PCB. Electrical interfacing is provided
via a 4-pin 2.54 mm header and a Molex PicoBlade
connector, enabling straightforward integration
into embedded systems, microcontroller
platforms, and gas detection devices.
Compact sensor board with LED status indication and
flexible mounting options
MAIN FEATURES
FURTHER INFORMATION
Weight
Dimensions (l x w x h)
Article number
Scope of delivery
Customs tari number
EAN
8 g
41 x 25 x 21 mm
SEN-MQ135-V2
MQ135 sensor board
90269000
4250236830629
Joy-IT powered by SIMAC Electronics GmbH - Pascalstr. 8 - D-47506 Neukirchen-Vluyn
Published: 2026.01.15
Measurable substances
Benzene, Ammonia, sulfide, smoke, Nitrogen oxides and other air
pollution
Measurement range
10 - 1000 ppm
Application areasDetecting gas leaks, gas alarm, robotic, microcontroller projects
Supply voltage5 V DC
Interfaces
4pin pin header (2.54 mm), molex picoblade (53261-0471)
Output
Analog sensor value output 0 V - 5 V,
digital threshold output 0 V / 5 V (threshold adjustable with onbo-
ard potetiometer
Heat up time
At every start of the sensor it needs to heat up for 10 to 15 minutes
before the sensor can deliver a reliable value.
Burn-in time
When first used, the sensor requires a burn-in period of 48 to 168
hours of continuous operation to stabilize the sensing element;
aerwards, a baseline reading should be taken in clean air to esta-
blish a reliable reference value. This procedure should be repeated
if the sensor has been powered o for several weeks or longer.
LED indicator
Power LED (green), status LED (red)
You can also solder the LEDs on the opposite side of the board to
adapt it to the requirements of your project
This shows the typical sensitivity characteristics of the MQ-135. Rs means resistance of the
sensor in dierent gases, Ro means resistance of sensor in 1000ppm NH3.
Correlation between sensor resistance(Rs) and ambient temperature and humidity
The resistance of the sensor can be calculated with the following formula:
V= Supply voltage (5 V); V= Analog pin voltage; R= Load resistance (1500 Ω)RLL
Product specificaties
| Merk: | Joy-it |
| Categorie: | Niet gecategoriseerd |
| Model: | SEN-MQ135-V2 |
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