He decided to take an in-depth look at the DHT11 sensor; which you can get your hands on for under $3 if you know where to look. The four-pin device uses a 1-wire protocol.

Called BME690, the “sensor can be used for breath analysis and to reduce food waste through early spoilage detection”, said distributor Mouser, which is stocking the part. “BME690 is an advanced ...