SHT30 — i2c address & wiring
The entry-grade Sensirion temperature/humidity sensor — here in a sealed waterproof probe.
Key facts
SHT30 at a glance
| i2c address | 0x440x45 address-selectable via pins/jumpers |
|---|---|
| Logic voltage | 2.4–5.5 V |
| Type | sensor |
| Part | Sensirion SHT30 |
| Ships with | generic modules — plain 0.1″ headers, no connector system |
| Datasheet | Sensirion SHT30 — manufacturer documentation ↗ |
The chip
What the Sensirion SHT30 actually is
Entry model of Sensirion's SHT3x family: factory-calibrated temperature and relative humidity over plain i2c, with the same command set and addresses as the SHT31 and SHT35 above it and a slightly looser accuracy grade. The linked module is the sealed stainless-probe form for soil, greenhouse and outdoor use.
Watch out: It answers 0x44/0x45 — the exact addresses of the SHT31 and SHT35 — so you can't mix SHT3x grades on one bus without splitting the address pin. Sealed probe housings also slow humidity response from seconds to minutes; that lag is the enclosure doing its job, not a fault.
Wiring
How to connect the SHT30
The SHT30 talks i2c at address 0x44 (up to 2 selectable addresses, handy when you need more than one on the same bus). It runs at 2.4–5.5 V, so match your host's logic level — if your host is 5 V and a board on the bus is 3.3 V-only, add a level shifter. Use the compatibility checker to confirm the exact cable for your setup.
Because the address is selectable, you can run several SHT30 boards on one bus by setting each to a different address — no extra wiring beyond the shared SDA/SCL.
Wiring is the usual four: power, ground, SDA and SCL, plus pull-up resistors — almost always already fitted on the breakout. Nothing showing up? Run an i2c scan first; if the bus is silent, the 7-step checklist finds it faster than guessing.
Alternatives
Other environmental boards
Watch the bus
Boards that clash with the SHT30
These want addresses the SHT30 also answers (0x44, 0x45), so they can't share a bus with it untouched. If one is address-selectable, strap it elsewhere; if not, the conflict guide covers the multiplexer and second-bus routes, and the collision roundup explains why a scan won't warn you.
Get one
Questions
SHT30 i2c FAQ
What is the SHT30's i2c address?
The SHT30 uses 0x44 or 0x45, selected with an address pin or solder jumper on the board. If a scan turns up something unexpected, our i2c address list names the usual suspect for every address.
What voltage does the SHT30 run at?
2.4–5.5 V logic. That range covers both 3.3 V and 5 V hosts, so it drops onto a Pi, ESP32 or Arduino without a level shifter.
Can I use two SHT30s on one i2c bus?
Yes — set each one to a different address (0x44, 0x45) using its address pin or jumper, then wire both to the same SDA/SCL. That gives you up to 2 on a single bus before you need a multiplexer.
Does the SHT30 come as a plug-together breakout?
Not in the mainstream connector ecosystems — SHT30 modules are generic boards with 0.1″ headers, so you'll be soldering headers and running jumper wires to SDA, SCL, power and ground.
What should I watch out for with the SHT30?
It answers 0x44/0x45 — the exact addresses of the SHT31 and SHT35 — so you can't mix SHT3x grades on one bus without splitting the address pin. Sealed probe housings also slow humidity response from seconds to minutes; that lag is the enclosure doing its job, not a fault.