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A Particle Photon 2 can power a connected temperature and humidity monitor, but it does not measure temperature or humidity by itself. Add a separate digital sensor; Particle recommends an I2C device from Sensirion’s SHT3x family for this kind of Photon 2 use. The basic connection is straightforward, provided the sensor module’s I2C logic is compatible with the Photon 2’s 3.3 V bus.
What the Photon 2 does—and what the sensor does
The Photon 2 is the monitor’s controller and network interface. A separate sensor measures the air and sends digital readings to the board over I2C. Particle’s Photon 2 migration guide recommends an I2C temperature and humidity sensor such as the SHT3x.
This distinction matters when choosing parts: buying a Photon 2 alone does not provide temperature or humidity readings. For a maker build, an SHT3x-compatible breakout is generally more convenient to connect than a bare sensor IC, but breakout boards differ. Check the specific module’s documentation for supply voltage, logic levels, I2C pull-ups, and connector arrangement before wiring it.
Choose an SHT3x sensor module carefully
Sensirion’s SHT3x-DIS datasheet lists typical SHT35 accuracy of ±1.5 %RH for relative humidity and ±0.1 °C for temperature. These are component specifications, not a measurement of a complete Photon 2 monitor. The assembled device’s accuracy has not been established here.
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Do not infer that a sensor module is safe to connect just because the sensor IC itself accepts a particular supply range. The module’s pull-up resistors and logic levels must also suit the Photon 2’s 3.3 V I2C bus. In particular, the Photon 2 I2C pins are not 5 V tolerant; do not connect a 5 V I2C bus directly to them. Consult both the module documentation and the Sensirion SHT3x-DIS datasheet when checking electrical compatibility.
Wire the sensor to the Photon 2
The Photon 2 has one I2C port. Its I2C data line is D0/SDA, and its clock line is D1/SCL. Particle specifies a 3.3 V bus, says it is not 5 V tolerant, and specifies support up to 400 kHz. Keep the bus within that limit even if a particular SHT3x sensor supports a higher I2C speed.
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| Photon 2 connection | Connect to | Check before powering |
|---|---|---|
| D0 / SDA | Sensor module SDA | Module I2C logic and pull-ups must be compatible with 3.3 V. |
| D1 / SCL | Sensor module SCL | Keep the I2C bus at or below 400 kHz. |
| Power and ground | Module supply and ground connections | Follow the module’s documented supply requirements; do not assume every breakout uses the same voltage or connector. |
Particle’s Photon 2 datasheet describes the board’s I2C port and electrical limits. Confirm the labels and supply requirements on the specific breakout rather than relying on the sensor family name alone.
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What connectivity makes possible
The Photon 2 supports 2.4 GHz and 5 GHz Wi-Fi as well as Bluetooth Low Energy (BLE) 5, according to Particle’s Photon 2 product page. Those board-level capabilities give a project options for networked designs, but they do not define how this particular monitor reports or stores readings.
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A dashboard, cloud destination, local log, graph, sampling interval, and alert behavior each depend on implementation choices. The hardware documentation cited here does not establish a ready-made monitoring service or a specific reporting workflow, so treat those features as parts of the project to design rather than automatic Photon 2 functions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Operating environment and project limits
Particle specifies a Photon 2 operating range of −20 to +70 °C and up to 95% relative humidity, non-condensing. These are limits for the board, not the measurement range or accuracy of the SHT3x sensor. A monitor’s suitability for a particular environment also depends on the sensor module and how the assembly is deployed.
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- Available as left or right board: Choose from Right Board or Left Board variants based on which side of the extruder needs replacement.
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- Replacement Hall detection board: Serves as a direct replacement when the existing filament sensor board needs to be changed.
No enclosure, battery-life estimate, environmental protection level, calibration process, firmware, or prototype test is established here. The SHT35 figures above should therefore be read as component specifications, not verified performance for a finished device.
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