ESP32 Microcontrollers Quietly Replace Raspberry Pis in Home Lab Setups

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A home lab enthusiast has replaced nearly half their Raspberry Pi devices with ESP32 microcontrollers over the past two years, citing significant cost and power advantages. While a Raspberry Pi 4 or 5 consumes 3–5 watts at idle and costs up to $80 with accessories, an ESP32 devkit draws as little as 0.08 watts and costs under $12. The author highlights five practical use cases where the ESP32 outperforms a Pi, including serving as a Bluetooth Low Energy proxy for smart home sensors in multiple rooms. Running four ESP32s as BLE proxies via ESPHome, the combined power draw is roughly 0.6 watts, less than a single idle Pi 4, with 11 months of uninterrupted uptime. The key argument is that for always-on tasks not requiring Linux, Docker, or heavy processing, the ESP32 offers a simpler, cheaper, and more resilient alternative.

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