Verified 2026-10

dfrobot Gravity: PM2.5 Air Quality Sensor

Laser-scattering particle sensor that reports PM1.0, PM2.5 and PM10 over a 3.3 V I2C Gravity interface, 3.3-5 V supply at up to 100 mA.

Place this board on a carrier in the editor →

Logic level3.3 V

Part & documents

Source	www.dfrobot.com/product-2439.html →

Pinout

4 pads, as the vendor numbers them.

#	Name	Signals
1	VCC/+	power positive 3.3-5 V
2	GND/-	ground
3	SCL/C	I2C clock, 3.3 V logic
4	SDA/D	I2C data, 3.3 V logic

Buses

Bus	Signals	Pins	Voltage	Note
I2C ×1	SDA, SCL	SDA, SCL

Power

Input	3.3-5.0 V
Typical draw	100 mA

Notes

part is null because DFRobot publishes no part number for the laser module. addresses is empty because the vendor publishes no I2C address for this board. The 100 mA figure is the vendor's maximum working current and is recorded as the headline current rather than a typical draw. The pin table is DFRobot's own, with both the slash form and the single-letter form of each label, in the vendor's 1-4 order.

AI context

Dense context for pasting into a model prompt — addresses, pinout, voltages, tolerances and the vendor's reference circuit.

PART: DFRobot Gravity: PM2.5 Air Quality Sensor, 67 x 40 x 14 mm. A laser-scattering particle sensor module that reports PM1.0, PM2.5 and PM10 over I2C, with a Gravity 4-pin interface. DFRobot publishes no silicon part number for the laser module, so part is null.
SUPPLY: 3.3 V to 5.0 V working voltage, 100 mA maximum working current, standby current 2 mA or less.
LOGIC LEVEL: the vendor gives the data interface as L below 0.8 V, H above 2.7 V, and states the maximum voltage level is 3.3 V - so the I2C lines are 3.3 V logic even when the module is powered from 5 V.
PINOUT: pad 1 'VCC/+' power positive, pad 2 'GND/-' power negative, pad 3 'SCL/C' I2C clock, pad 4 'SDA/D' I2C data. DFRobot's table numbers these 1-4 and prints both forms of each label on the silkscreen.
MEASUREMENT: particle size bins 0.3-1.0 um, 1.0-2.5 um and 2.5-10 um; counting efficiency 50 % at 0.3 um and 98 % at 0.5 um and above; effective mass-concentration range 0-500 ug/m3 with a maximum range of 1000 ug/m3 or more; resolution 1 ug/m3; consistency +/-10 % at 100-500 ug/m3 and +/-10 ug/m3 at 0-100 ug/m3; standard volume 0.1 L; single response time under 1 s, comprehensive response time 10 s or less.
ENVIRONMENT: working temperature -10 C to +60 C, working humidity 0-95 %RH non-condensing, mean time between failures 5 years or more.
TRAPS: (1) The I2C lines are 3.3 V maximum - driving them from a 5 V MCU without level shifting exceeds the vendor's stated maximum voltage level. (2) The 100 mA peak is well above a GPIO rail's spare capacity; power it from the 5 V or 3.3 V rail, not a pin. (3) Humidity must stay non-condensing. (4) No I2C address is published for the module, so scan the bus.

Provenance

Every figure on this page was read from the 2 sources below and last checked on Oct 29, 2026.