> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt # SparkFun Indoor Air Quality Combo Sensor - SCD41, SEN55 (Qwiic) **Type:** Product page · **SKU:** SEN-25200 · **Brand:** [Sparkfun](https://core-electronics.com.au/brands/sparkfun-australia) **Page:** https://core-electronics.com.au/sparkfun-indoor-air-quality-sensor-scd41-sen55-qwiic.html ([markdown](https://core-electronics.com.au/sparkfun-indoor-air-quality-sensor-scd41-sen55-qwiic.html.md)) The SparkFun Indoor Air Quality Sensor - SCD41 SEN55 (Qwiic) combines two excellent indoor air quality sensors in the SCD41 and SEN55 from Sensirion™... ## Pricing - **Price:** $334.95 (inc GST) — $304.50 AUD, exc GST - **Quantity discounts:** 5+ $295.36 (exc GST) · 25+ $289.27 (exc GST) · 100+ $277.09 (exc GST) ## Availability & dispatch - Available with a lead time — expect dispatch between Aug 27 and Sep 02. ## How to buy - **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=SEN-25200:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart. - **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/SEN-25200:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.) - **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there. - **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works) - **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt ## Description The SparkFun Indoor Air Quality Sensor - SCD31, SEN55 (Qwiic) combines two excellent indoor air quality sensors, the SCD41 and SEN55 from Sensirion™. These sensors provide a comprehensive indoor air quality sensor that measures CO2, Volatile Organic Compounds (VOCs), particulate matter (PM1.0, 2.5, 4, and 10), temperature, and relative humidity. The SCD41 uses Sensirion's PASens® photoacoustic measurement system, which combines narrow-band IR light and a microphone inside the sensing package to detect concentrations from 0 to 40000 ppm with high accuracy over 400-5000 ppm ±(40 ppm+5%). The SCD41 has an integrated temperature and humidity CMOS® sensor to improve accuracy. For additional accuracy, the SCD41 also accepts ambient pressure readings! The SCD41 includes an automatic self-calibration routine to adjust to its sensing environment over a seven-day calibration period. For best results, Sensirion recommends taking continuous readings for at least one hour a day of 'fresh air' to complete the calibration period. The SCD41 also has a one-shot measurement option for an optimal reduction in power consumption. The SEN55 environmental sensor node uses Sensirion's proprietary algorithms to provide straightforward integration into various air quality monitoring applications. The sensor measures particulates of the following size specifications: PM1, PM2.5, PM4, and PM10 from a concentration of 0 to 1,000 µg/m3. It also senses both VOC and NOx indexes from 1 to 500 index points. It offers a robust set of control registers to take and report measurements, check the status of the module and its components, and report them all in easily digestible serial data ove I2C. The SparkFun Qwiic Indoor Air Quality Combo Sensor takes care of all the pesky power requirements of the SEN55 and SCD41 with onboard DC voltage conversion, allowing a simple, single Qwiic connection for power and communication. *The [SparkFun Qwiic Connect System](https://www.sparkfun.com/qwiic) is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.* Get Started With the SparkFun Indoor Air Quality Sensor - SCD31 ### Features **SparkFun Indoor Air Quality Sensor Features** - I2C Interface (Qwiic Enabled) - 2x Qwiic Connectors - 0.1"-spaced PTH header - AP3012 - 500mA/29V 1.5MHz STEP-UP DC/DC Boost Converter - Used for supply voltage to SEN55 **SCD41 Features** - I2C Address: **0x62** - Supply Voltage Range: **2.4-5.5V** (**3.3V** Typ.) - Low Current Consumption: - Normal Mode: - Max: **205mA@3.3V** - Typ: **18mA@3.3V** - Low Power Mode: - Typ: **3.5mA@3.3V** - Single-Shot: - **0.5mA@3.3V** - Photoacoustic Measurement System - Sensirion's PASens Technology - Integrated Temperature and Humidity Sensor - Sensirion's CMOSens Technology - CO2 Output Range: 0-40,000ppm - CO2 Measurement Accuracy: ±(40ppm + 5% of reading) - Conditions: 400-5,000ppm - Humidity Range: 0-100%RH - Humidity Accuracy: ±9%RH (Full Range) - Temperature Range: -10°C-60°C - Temperature Accuracy: ±1.5 (Full Range) **SEN55 Features** - I2C Address: **0x69** - Supply Voltage: **4.5V** - Average Supply Current: **63mA** - Max. supply current: **110mA** - Particulate Matter - Mass concentration precision: ±10% - Mass concentration range: 0 - 1000µg/m³ - Lifetime: > 10 years - Particle size range: PM1.0, PM2.5, PM4 and PM10 - Temperature - Typ. temperature accuracy: 0.45°C - Operating temperature range: -10 - 50°C - Response time(t63%): < 60s - Humidity - Typ. relative humidity accuracy: 4.5 %RH - Operating relative humidity range: 0 - 90 %RH - Response time(t63%): 20s - VOC - Sensor output: 0-500 VOC Index - Measurement range: 0 - 1000ppm - Response time(t63%): < 10s - Device-to-device var.: ±15% m.v. - Limit of detection: < 0.05 ppm of ethanol equivalents or < 10 % of concentration setpoint, whichever is larger - Switch-on time: 1h - On-chip humidity compensation ### Documents - [Schematic](https://core-electronics.com.au/attachments/localcontent/SparkFun_Indoor_Air_Quality_Sensor-Schematic_55930a95655.pdf) - [KiCad Files](https://core-electronics.com.au/attachments/localcontent/SparkFun_Indoor_Air_Quality_Sensor_-_SCD41_SEN55_215268bd708.zip) - [Board Dimensions](https://core-electronics.com.au/attachments/localcontent/SparkFun_Indoor_Air_Quality_Sensor-Dimensions_5768745df78.pdf) - Datasheets - [SCD4x](https://core-electronics.com.au/attachments/localcontent/Sensirion_SCD4x_Datasheet_11579fd30be.pdf) - [SEN5x](https://core-electronics.com.au/attachments/localcontent/Sensirion_Datasheet_Environmental_Node_SEN5x_137509e2861.pdf) - [Qwiic Information Page](https://www.sparkfun.com/qwiic) - [Sensirion Arduino Core Library](https://github.com/Sensirion/arduino-core) - [SparkFun SCD4x Arduino Library](https://github.com/sparkfun/SparkFun_SCD4x_Arduino_Library) - [Sensirion SEN5x Arduino Library](https://github.com/Sensirion/arduino-i2c-sen5x) - [GitHub Hardware Repo](https://github.com/sparkfun/SparkFun_Indoor_Air_Quality_Sensor-SCD41-SEN55) ## Images - [Product image 1](https://core-electronics.com.au/media/catalog/product/S/E/SEN-25200-1.jpg)