Environmental

Bosch BME688 environmental sensor on STEMMA QT/Qwiic breakout with 3–5 V input, onboard 3.3 V regulator and level shifting. I2C or SPI interface.

Sensirion SCD40 photoacoustic NDIR CO₂ sensor on STEMMA QT/Qwiic breakout with on-board 3.3 V regulation and I2C level shifting. Measures CO₂, temperature, and humidity.

Sensirion SCD41 photoacoustic NDIR CO2 sensor on an Adafruit STEMMA QT/Qwiic breakout with onboard 3.3V regulation and I2C level shifting. Measures CO2, temperature, and humidity with extended CO2 range vs SCD40.

Analog pressure sensor (0-150 PSI range) with 5 VDC excitation. Outputs a voltage proportional to pressure (approximately 0 to 4.5 V over the full range). Threaded connection (1/8" NPT male) allows it to be installed in a pressure line. Commonly used for measuring fuel, oil, or air pressure in automotive and industrial systems.

Bosch BME280 sensor breakout for temperature, humidity, and barometric pressure. Measures humidity (±3% accuracy), pressure (±1 hPa), and temperature (±1.0°C). Supports I2C and SPI communication. Onboard 3.3V regulator and level shifting allow 3-5V supply and logic compatibility, making it easy to use with Arduino (5V) or Raspberry Pi (3.3V).

Bosch Sensortec BME280 is a bare LGA-8 combined digital humidity, barometric pressure, and temperature sensor. Tiny 2.5 x 2.5 x 0.93 mm package with I2C (up to 3.4 MHz) and SPI (3- and 4-wire, up to 10 MHz). Independent VDD (1.71-3.6 V) and VDDIO (1.2-3.6 V) supplies suit battery-powered and ultra-low-power designs at 3.6 uA running and 0.1 uA in sleep.

DFRobot Gravity SEN0257 is a 3-pin analog water/liquid pressure transducer. A G1/4" (BSP parallel) male threaded port screws into a pressurized line; on a 5 VDC supply the sensor produces a linear ratiometric analog output of 0.5 V at 0 MPa rising to 4.5 V at full-scale 1.6 MPa (~232 psi, 16 bar). IP68 rated, -20 to +85 °C operating range, <2 ms response, ~2.8 mA quiescent draw. Connects to Arduino-style ADCs via the included 1 m three-wire Gravity cable (yellow = signal, red = VCC, black = GND) and ships with a G1/2-to-G1/4 thread adapter. Service life rated at 10 million pressurization cycles.

Dual-channel NDIR CO₂ sensor module with integrated humidity and temperature sensing, internal RH/T compensation, and selectable I2C, Modbus-TTL UART, and PWM outputs.

Ultra-high-accuracy digital humidity and temperature sensor with fixed-address I2C, integrated heater, factory calibration, and a compact DFN package for direct PCB integration.

Sensirion SCD30 NDIR CO2 sensor module carried by SparkFun (SEN-15112) with on-module temperature and humidity sensing. Supports I2C or Modbus/UART operation, plus RDY and PWM pins for data-ready and concentration output.

High-accuracy 16-bit digital temperature sensor with I2C/SMBus interface and EEPROM in a 6-pin WSON (DRV) package.