BME280 Humidity & Temperature Sensor Probe -7Semi

Overview

The probe is based on the Bosch BME280 environmental sensor IC, integrated inside a sealed probe enclosure with a cable interface.

• Measures:

  • Temperature

  • Relative Humidity

  • (Internally also pressure, though probe is mainly used for temp & humidity monitoring)

   

• Designed for remote sensing applications, where the sensing element must be placed away from electronics.

The key difference from standard breakout boards is the probe-style packaging, not the sensing technology.

Internal Working Principle

The probe internally uses the same sensing technologies as the BME280 IC:

Temperature

• Bandgap-based sensing element

• Provides temperature data for:

  • Direct output

  • Compel

   

  Humidity

  • Capacitive polymer sensing layer

  • Absorbs moisture dielectric constant changes capacitance change digital output

   

  Pressure (internal)

  • MEMS diaphragm senses atmospheric pressure changes

  All signals are processed using internal calibration coefficients stored in the chip.

  Measurement Characteristics

  • Temperature range: 40C to +85C

  • Humidity range: 0% to 100% RH (non-condensing)

  • Pressure range: 300 hPa to 1100 hPa

   

  Accuracy

  • Temperature: 0.5C (typical)

  • Humidity: 3% RH (typical)

  • Pressure: 1 hPa (typical)

   

  Electrstrong

• Current consumption: ~3.6 A (typical active mode)

• Interface: I2C digital communication

The probe outputs fully calibrated digital data, eliminating the need for external ADC.

Communication & Data Output

• I2C address: 0x76 or 0x77 selectable

• Output resolution: 16-bit digital data

• Data includes:

  • Compensated temperature

  • Compensated humidity

  • Pressure (optional use)

   

Probe Design Characteristics

Sealed Probe Structure

• Encased in plastic + metal or MRS-type enclosure

• Protects sensor from:

  • Dust

  • Mechanical damage

  • Environmental exposure

   

Typical cable length: ~1 meter

Pre-wired connections:

• VCC

• GND

• SDA

• SCL

Enables remote placement of sensing element without signal degradation.

Environmental Behavior

Fast Response

• Humidity response time: ~1 second

Stability

• Factory calibrated stable over long-term use

• Low drift under normal conditions

Compensation

• Internal temperature compensation improves humidity accuracy

Internal Processing Features

• Built-in calibration coefficients

• Digital compensation algorithms

• Optional oversampling and filtering

• Low-noise measurement outp>Measures relative humidity, not absolute moisture content

• Accuracy affected by:

  • Condensation

  • Poor airflow around probe

   

• Pressure readings may be less relevant depending on probe enclosure design

• Requires proper placement for accurate readings (air exposure is critical)

Operating Behavior

• Works best in:

  • Continuous measurement mode

  • Stable airflow conditions

   

• Important considerations:

  • Avoid water condensation on probe

  • Avoid sealed environments without airflow

   

Summary

The 7Semi BME280 Sensor Probe is a remote environmental sensing solution that:

• Integrates temperature, humidity, and pressure sensing in a sealed probe

• Providaccuracy calibrated digital output via I2C

• Supports remote placement using a cable interface

• Offers low power consumption and fast response

• Is optimized for reliable environmental monitoring in distributed systems

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