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* Soap bubble liquid | * Soap bubble liquid | ||
* Lots of cables... | * Lots of cables... | ||
<gallery mode=" | <gallery mode="nolines" heights="100"> | ||
File:CO2 sensor.jpg|CO<sub>2</sub> sensor - MH-Z19C | File:CO2 sensor.jpg|CO<sub>2</sub> sensor - MH-Z19C | ||
File:Stepper motor + driver.jpg|Stepper motor 28BYJ-48 + stepper motor driver module ULN2003 | File:Stepper motor + driver.jpg|Stepper motor 28BYJ-48 + stepper motor driver module ULN2003 | ||