Learn how to repurpose your spare ESP32 boards into cost-effective presence detection sensors using the Tommy Sense ...
XDA Developers on MSN
6 smart home devices anyone can build with a cheap ESP32 and an even cheaper sensor
These are some great DIY projects that you can do for cheap.
Sample sketch for the MQ-2 Gas Sensor Module, sold by Circuitrocks. This example reads the analog output of an MQ-2 gas sensor and prints the raw ADC value plus voltage. No external library required.
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