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How Long Will Your ESP32 Sensor Actually Run on a Single 18650?
Daniel is building a parking spot presence sensor with an ESP32 and a single 18650 cell. He wants to know if it runs for weeks or dies in two days. This episode walks through the actual mathematics step by step — sleep currents, ultrasonic pings, LoRaWAN transmissions, voltage regulator losses, battery derating, and the killer variable of retransmissions in a concrete parking garage. The spreadsheet says 11 years. Reality says something very different. Episode 4360 — myweirdprompts.com/n/4360 (permanent short link: myweirdprompts.com/086626)
The skinny
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