I started the Saturday wondering about odor recognition devices. I understand this is an under the radar area and would love to know about the state of the art

I started the Saturday wondering about odor recognition devices. I understand this is an under the radar area and would love to know about the state of the art and possible hacking (e.g. arduino) possibilities [1][2][3][4][5]. [1] https://www.reddit.com/r/MachineLearning/comments/ri8f7a/d_has_there_been_any_work_on_detecting_predicting/ https://www.reddit.com/r/MachineLearning/comments/ri8f7a/d_h... [2] (8 years ago) https://www.reddit.com/r/askscience/comments/4j09vv/why_do_things_smell_can_smell_be_measured/ https://www.reddit.com/r/askscience/comments/4j09vv/why_do_t... [3] https://www.reddit.com/r/RASPBERRY_PI_PROJECTS/comments/16xy4dr/what_kind_of_compatible_censor_can_detect_fecal/ https://www.reddit.com/r/RASPBERRY_PI_PROJECTS/comments/16xy... [4] https://www.reddit.com/r/AirPurifiers/comments/198i0nu/air_purifier_that_detects_smells/ https://www.reddit.com/r/AirPurifiers/comments/198i0nu/air_p... [5] https://www.reddit.com/r/chemistry/comments/1by94bv/are_there_any_odor_sensors_for_sulfur_compounds/ https://www.reddit.com/r/chemistry/comments/1by94bv/are_ther...