I2<\/sup>C pull-ups (configurable)<\/li>\n<\/ul>\n\nDocuments:<\/strong><\/p>\n\n\n- STC31 Datasheet<\/a><\/li>\n
- STC Field Calibration Guide<\/a><\/li>\n
- STC Design-In Guide<\/a><\/li>\n
- Schematic<\/a><\/li>\n
- Eagle Files<\/a><\/li>\n
- Arduino Library<\/a><\/li>\n
- Hardware Repo<\/a><\/li>\n<\/ul>","description_markdown":"Do you need to be able to sense CO2<\/sub> concentrations of up to 100%? If so, the STC31 is the sensor for you! The Sensirion STC31 thermal conductivity sensor has two CO2<\/sub> measurement ranges: 0 to 25 vol%; and 0 to 100 vol%. The measurement repeatability is 0.2 vol%, with a stability of 0.025 vol% \/ \u00b0C. The measurement accuracy depends on the measurement range: 0.5 vol% + 3% measured value; 1 vol% + 3% measured value.\r\n\r\nOur breakout includes a separate SHTC3 humidity and temperature sensor; allowing the STC31 to deliver humidity-compensated measurements together with improved temperature compensation. The STC31 can compensate for atmospheric pressure too - which is handy if, like us, you\u2019re up in the mountains!\r\n\r\nThe STC3x sensor family is Sensirion\u2019s series of Gas Concentration sensors designed for high-volume applications. The STC3x utilizes a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 a perfect choice for applications where reliability is key.\r\n\r\nThe outstanding performance of these sensors is based on Sensirion\u2019s patented CMOSens\u00ae sensor technology, which combines the sensor element, signal processing and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.\r\n\r\nThe STC31\u2019s I2<\/sup>C address can be configured using the split-pad jumpers on the back of the board. The SHTC3\u2019s I2<\/sup>C address is non-configurable; you will need a [Qwiic Mux](https:\/\/www.sparkfun.com\/products\/16784) if you want to connect multiple sensors to the same bus.\r\n\r\nAs usual, our board includes a power LED, a pair of Qwiic connectors, I2<\/sup>C breakout pads and pull-up resistors. You can disable the LED and pull-ups if you need to by cutting the I2C jumpers on the back of the board.\r\n\r\nOur [Arduino library](https:\/\/github.com\/sparkfun\/SparkFun_STC3x_Arduino_Library) contains example sketches for the Arduino IDE to get you up and running quickly. It can be downloaded through the Arduino Library manager: search for 'SparkFun STC3x' or it can be found in the Documents tab above.\r\n\r\n***\r\n\r\n*The [SparkFun Qwiic Connect System](https:\/\/www.sparkfun.com\/qwiic) is an ecosystem of I2<\/sup>C 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\u2019t hook it up wrong.*\r\n\r\n***\r\n\r\n
Experimental Product:<\/b> SparkX<\/a> products are rapidly produced to bring you the most cutting edge technology as it becomes available. These products are tested but come with no guarantees. Live technical support is not available for SparkX products. Head on over to our forum<\/a> for support or to ask a question.<\/div>\n\n**Features:**\n\n- Sensirion STC31 CO2<\/sub> Sensor\r\n - Thermal conductivity sensor provides calibrated gas concentration and temperature output\r\n - Calibrated for: CO2<\/sub> in N2<\/sub>; and CO2<\/sub> in air\r\n - Measurement ranges: 0 to 25 vol%; 0 to 100 vol%\r\n - Accuracy: 0.5 vol% + 3% measured value; 1 vol% + 3% measured value\r\n - Repeatability: 0.2 vol%\r\n - Temperature measurement range: -20 \u00b0C to +85 \u00b0C\r\n - Concentration and temperature resolution: 16-bit\r\n - Start-up time: 14 ms\r\n - I2<\/sup>C address (configurable): 0x29 (default), 0x2A, 0x2B, 0x2C\r\n - Supply Voltage: 2.7VMin<\/sub>, 3.3VTyp<\/sub>, 5.5VMax<\/sub>\r\n - **Note:** Qwiic bus operates at 3.3VMax<\/sub>\r\n- Sensirion SHTC3 Humidity and Temperature Sensor\r\n - Allows the STC31 to compensate for humidity and temperature\r\n - Typical accuracy: \u00b12 %RH and \u00b10.2 \u00b0C\r\n - Specified humidity range (extended): 0 to 100 %RH\r\n - Specified temperature range: -40 \u00b0C to +125 \u00b0C\r\n - I2<\/sup>C address (non-configurable): 0x70\r\n - Supply Voltage: 1.62VMin<\/sub>, 3.3VTyp<\/sub>, 3.6VMax<\/sub>\r\n - **Note:** Qwiic bus operates at 3.3VMax<\/sub>\r\n- Dual Qwiic connectors\r\n- Power LED (configurable)\r\n- I2<\/sup>C pull-ups (configurable)\n\n**Documents:**\n\n* [STC31 Datasheet](https:\/\/cdn.sparkfun.com\/assets\/6\/2\/4\/0\/0\/Sensirion_Thermal_Conductivity_Datasheet_STC31_D1.pdf)\r\n* [STC Field Calibration Guide](https:\/\/cdn.sparkfun.com\/assets\/4\/5\/3\/1\/a\/Sensirion_TC_AN_STCxx_FieldCalibration_D1.pdf)\r\n* [STC Design-In Guide](https:\/\/cdn.sparkfun.com\/assets\/4\/b\/a\/8\/1\/Sensirion_TC_AN_STCxx_Design-In_Guide_D1.pdf)\r\n* [Schematic](https:\/\/cdn.sparkfun.com\/assets\/5\/e\/4\/e\/9\/Qwiic-CO2_Sensor-STC31_Schematic.pdf)\r\n* [Eagle Files](https:\/\/cdn.sparkfun.com\/assets\/0\/3\/2\/e\/9\/Qwiic-CO2_Sensor-STC31_Eagle_Files.zip)\r\n* [Arduino Library](https:\/\/github.com\/sparkfun\/SparkFun_STC3x_Arduino_Library)\r\n* [Hardware Repo](https:\/\/github.com\/sparkfunX\/Qwiic_CO2_Sensor-STC31)\n\n","date_published":"2021-08-09 08:42:14.052381-06","price":79.95,"qty_price":{"1":79.95},"in_stock":true,"backorder_allowed":true,"is_rohs_compliant":false,"is_export_controlled":false,"is_oshw":true,"in_eagle_library":false,"in_fritzing_library":false,"sparkfun_original":true,"hstariff":"9027.10.20.00","pack_length":"93mm","pack_width":"65mm","pack_height":"5mm","packed_weight":"0.0090lbs","ascii_art":"\n\n\n\n\n\n\n\n\n\n\n .cxdoc;.\n 'dkkkkkkkO0ko:,.\n :kK0xllllcdOKKKKKK0xo:'.\n ;xOdc;c0KKKKK0kxk0KKXXXXXXKKKKKK0xl;.\n .:kO0OOOOkkkdkKKXXXXKXXXXXXKkdddoodxO0KKKOdc,.\n .lO0O0000OO0O0xc:::OXXXXXXXKklox0K0OxdlcloxkOKKK0xo:'.\n cO0000000OO0OK0KOdodKXXXXXKOxxk0KKKKK0O00kdcolloxOKKKKKOdc,.\n okkOOx000OK00KkO00XXXXXXKkxk0KK0KK0kkxOk0c:cxOo:lO0KKKKKKKKKKkdc,.\n ,d000000XK0OOxkkOXXXXX0kdk0KK0k;dK00OOOkc.lOxooo0KXXXKXXKK000OkkkO0ko;.\n ;x:.'kKKKKKKkkkkKKXXXXKxxk0KK0OkOkOOOOkOXXK0xdxOKXXXXXKKXXX0kxdddoox00o'.\n .:dol,';OKOOO0KKOOXXXXXXXXKKKXX00OkkOOkk0KXX0kxkOKXKKK0kkOXXXXX0dlcclx0x,..\n .;.,,.,'..;OOxO0KKKKKXXXKXXKKKKOlccldKOKOKXX0kxk0KXXK00K0KKK0OOKXXXXKKKx;..\n 'xKK0xllc',.'xcdd:.dKKXXXXXXKKKddkkxdl;:0KKKKOxO0KKKK00000KKKKK0OkXXXKKk;..\n ;xOO00000KKKkxkKKK0xdkKKXXXXXKKxoccol.'OKKKKKKKXXXXXK0000000000O0XXOXXKk:..\n :OOxOOOOOkO0KKKKKKKKKKolx0KKKK0xdodoc.'k0KKKKKXKXXXXXKK00000000O0XNNKoOOc..\n .cxO0x:''';cOKKKKKKKK0l,:;;OKo::oxxx:.;O0KKKKKKXXXXXXXXKKKKK000OkKNXKdOkl'..\n ...,coxOKKKKKKKKKK0c,;;lO0o;,'ckKd:;o0KKKKKKKkdxk0XXXOOKKKKKK0O0X0ddkl'..\n .....,cok0KKK0dlldoK0c,'.lO0d',,;kKxlo0KKlc:;c:ookkOOkOKOdodd0xxl'..\n ......;cddolx00xlcdo0Ko,;'ckKx;..'kKXXKkxxo:l::;ldcol:,c:kl'..\n .....',cddoloO0kocllkKd;',;dKKKKXXKKKK0kxdlc.'..d0Ol'..\n .....';cddocoOKOolllxKKKKKKKXKKKKKKKKKKkoo0Oo'..\n .....';ldxollkKKKKKKKKKKKKKK000KKKKK0o,..\n .....';ldk0KKKKKKKO0KK0OkkOKK0d,..\n ....',;ldOKKKx;'''''cO0d,..\n ....',cldxxdlox0x;..\n .....'::ll;..\n ......\n\n\n\n\n\n\n\n\n\n\n\n","ascii_art_url":"https:\/\/www.sparkfun.com\/products\/18385\/images.txt","categories":[{"283":"SparkX"},{"305":"Environment"},{"1019":"STMicroelectronics"}],"quantity":61,"images":[{"58":"https:\/\/cdn.sparkfun.com\/r\/58-58\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-01.jpg","92":"https:\/\/cdn.sparkfun.com\/r\/92-92\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-01.jpg","188":"https:\/\/cdn.sparkfun.com\/r\/188-188\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-01.jpg","600":"https:\/\/cdn.sparkfun.com\/\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-01.jpg"},{"58":"https:\/\/cdn.sparkfun.com\/r\/58-58\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-02.jpg","92":"https:\/\/cdn.sparkfun.com\/r\/92-92\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-02.jpg","188":"https:\/\/cdn.sparkfun.com\/r\/188-188\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-02.jpg","600":"https:\/\/cdn.sparkfun.com\/\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-02.jpg"},{"58":"https:\/\/cdn.sparkfun.com\/r\/58-58\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-03.jpg","92":"https:\/\/cdn.sparkfun.com\/r\/92-92\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-03.jpg","188":"https:\/\/cdn.sparkfun.com\/r\/188-188\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-03.jpg","600":"https:\/\/cdn.sparkfun.com\/\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-03.jpg"},{"58":"https:\/\/cdn.sparkfun.com\/r\/58-58\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-04.jpg","92":"https:\/\/cdn.sparkfun.com\/r\/92-92\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-04.jpg","188":"https:\/\/cdn.sparkfun.com\/r\/188-188\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-04.jpg","600":"https:\/\/cdn.sparkfun.com\/\/assets\/parts\/1\/7\/7\/9\/5\/18385-STC31_Breakout-04.jpg"}],"related_products":[17260,16784,15123,20594,17259,22858,17258,22462,15440,17261,18345,17912,23715,16467,16829]}