Verified 2026-10

dfrobot I2C Temperature & Humidity Sensor (Stainless Steel Shell)

CHT8305C or CHT832X temperature and humidity sensor potted in a 304 stainless probe, 2.5-5.5 V, I2C on a four-wire cable with on-board 4.7 kOhm pull-ups.

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Logic level3.3 V

Part & documents

Source	www.dfrobot.com/product-2600.html →

Pinout

4 pads, as the vendor numbers them.

#	Name	Signals
1	VCC	supply 2.5-5.5 V, red wire
2	GND	ground, black wire
3	SCL	I2C clock, white wire = CHT8305, green wire = CHT832X
4	SDA	I2C data, yellow wire

Buses

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

Power

Input	2.5-5.5 V
Typical draw	0.0015 mA

Notes

part is null because one SKU carries either a CHT8305C or a CHT832X depending on the batch, identified only by the SCL wire colour (white vs green) per the vendor's own note; both data sheets are in sources and neither is recorded as datasheet_url. addresses is empty because the four-wire cable breaks out no AD0 pin and DFRobot publishes no address for the assembled probe - the data sheet's 0x40/0x44/0x48/0x4C options are described in ai_context, not asserted as this board's. DFRobot's 'Datasheet' download is a .zip of module documents, not a data-sheet PDF, so it is not recorded as datasheet_url.

AI context

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

PART: DFRobot I2C Temperature & Humidity Sensor, SKU SEN0546, a potted probe in a 304 stainless steel housing on a 1.5 m four-wire cable ending in a 2.54 mm DuPont connector. The same SKU ships with either a CHT8305C or a CHT832X sensor inside: DFRobot's wiki says a white SCL wire means CHT8305 and a green SCL wire means CHT832X, so part is null and both silicon data sheets are listed in sources.
SUPPLY: 2.5 V to 5.5 V (the CHT8305C's own range). Standby current 0.05 uA typical, 0.3 uA maximum; average operating current 1.5 uA typical, 3.0 uA maximum.
MEASUREMENT: temperature -40 C to 125 C at +/-0.5 C from 0 C to 50 C; relative humidity 0 to 100 %RH at +/-3.0 %RH from 20 %RH to 80 %RH. The board also exposes user-programmable high and low alarm thresholds for both quantities.
PINOUT: pad 1 VCC (red wire), pad 2 GND (black), pad 3 SCL (white on a CHT8305 part, green on a CHT832X part), pad 4 SDA (yellow). DFRobot's table lists the wires in that order and the wire sequence as 'red VCC; black GND; white/Green SCL; yellow SDA'. 5 cm of wire is reserved at the connector end.
REFERENCE CIRCUIT: The vendor states the probe carries two built-in 4.7 kOhm pull-up resistors and a 100 nF filtering capacitor, so no external pull-ups are needed on SCL/SDA. The CHT8305C data sheet independently calls for 4.7 kOhm to 10 kOhm pull-ups and a 400 kHz maximum bus clock.
I2C ADDRESS: the cable exposes no AD0 pin, so the address is fixed on the board and DFRobot does not publish which value it is set to. The CHT8305C sets its 7-bit address from AD0: 0x40 when AD0 is tied to GND (also the floating state), 0x44 to VCC, 0x48 to SDA, 0x4C to SCL. Scan the bus rather than assuming 0x40.
TRAPS: (1) Two different chips under one SKU - identify by the SCL wire colour before picking a driver library. (2) There is no address-select pin broken out, so two of these cannot share a bus. (3) The 304 housing is a probe housing, not an IP rating.

Provenance

Every figure on this page was read from the 4 sources below and last checked on Oct 29, 2026.