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Now that we're familiar with the SCD4X sensors and these breakouts, it's time to assemble it into a circuit.
SparkFun's Qwiic system makes assembling a circuit a breeze. Simply plug the breakout into your chosen microcontroller with a Qwiic cable. After assembling your circuit, it should look similar to the photo below:
[![SparkFun SCD40 plugged into the RedBoard Qwiic](./assets/images/Qwiic_SCD4x-Assembly.jpg){ width="400"}](./assets/images/Qwiic_SCD4x-Assembly.jpg "Click to enlarge") SparkFun CO2 Humidity and Temperature Sensor - SCD40 (Qwiic) plugged into the RedBoard QwiicReminder, for ideal results, make sure to fully calibrate the SCD4X by taking continuous measurements for one hour every day for seven days.
Those who prefer a traditional soldered assembly should solder wires or header pins to the PTH header on the side of the board. If you're not familiar with through-hole soldering or would like a refresher, take a look at our Through-Hole Soldering Tutorial: