Do you need to be able to sense CO2 concentrations of up to 100%? If so, the STC31 is the sensor for you! The Sensirion STC31 thermal conductivity sensor has two CO2 measurement ranges: 0 to 25...

Do you need to be able to sense CO2 concentrations of up to 100%? If so, the STC31 is the sensor for you! The Sensirion STC31 thermal conductivity sensor has two CO2 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% / °C. The measurement accuracy depends on the measurement range: 0.5 vol% + 3% measured value; 1 vol% + 3% measured value. Our breakout includes a separate SHTC3 humidity and temperature sensor; allowing...

The Inline DC Panel Meter Kit has all the bits you need to create an elegant, seamless DC volt/ameter. Measuring current usually means interrupting the VCC or ground return path, and 'interrupting'...

The Inline DC Panel Meter Kit has all the bits you need to create an elegant, seamless DC volt/ameter. Measuring current usually means interrupting the VCC or ground return path, and 'interrupting' usually means cutting. We designed the kit to be used 'inline' - no need to cut wires just plug your wall wart into the kit and the kit into your target device. We found it to be really handy to measure various 12V devices (routers, WiFi APs, etc) up to 10 amps. DC Panel Meters are a great way to...

There are times when you have multiple USB devices in your prototype or device and you just want to plug in one cable. You need a built in USB hub! The Qwiic USB Hub is a simple breakout board for...

There are times when you have multiple USB devices in your prototype or device and you just want to plug in one cable. You need a built in USB hub! The Qwiic USB Hub is a simple breakout board for the USB2514B USB hub IC. What gives it extra flair is the ability to configure the device over I2C. Out of the box, the board will appear as a standard USB 2.0 Hub; no configuration necessary. Closing the I2C jumper will put the device into configuration mode. We've got an Arduino Library to help you...

The RFM97C is a great little module that incorporates the SX1276 LoRa transceiver from Semtech. LoRa is best for long range communication (hundreds of feet), low power, and low data rates (~500bps)....

The RFM97C is a great little module that incorporates the SX1276 LoRa transceiver from Semtech. LoRa is best for long range communication (hundreds of feet), low power, and low data rates (~500bps). This 'Mini Shield' is designed to be attached to the top or bottom of any of our Thing Plus boards. Pictured is the ESP32 Thing Plus. We include a PTH soldering point for a low cost wire antenna (~3" for 915MHz) along side a stress relief hole. For folks that need a bit more oomph, there is a U.FL...

Designed exclusively with SparkFun's À la Carte custom board designer, the Toaster Oven Reflow Control Board is just that – a single, fully populated board for DIY temperature measurement and load...

Designed exclusively with SparkFun's À la Carte custom board designer, the Toaster Oven Reflow Control Board is just that – a single, fully populated board for DIY temperature measurement and load control. Specifically the board was designed for: Controlling up to two heating coils rated up to 5A/120V AC (common for most toaster ovens) Measuring up to two temperature inputs via K-Type thermocouples Displaying current status via a backlit 16x2 character LCD Reading an encoder with button select...