Air Pump
Recommendation for future design:
Use air pump with larger flow volume
Particle Counter
Recommendation for future design:
Can order more sensors to collect particle data inside the testbox
Battery
Link: https://www.mscdirect.com/product/details/79136081
Recommendation for future design:
Choose 6V or output voltage the same as that for the air pump
Arduino
Humidifier
Recommendation for future design:
Almost all humidifiers can be used in our testbed
It will be better to choose professional aeresol generator, which will solve the problem for moisture environment and will ovide higher concentration of particle.