Outdoor Temperature Humidity Sensor with an ESP32 and Esphomeyaml - ESPHome - Home Assistant Community

Outdoor Temperature Humidity Sensor with an ESP32 and Esphomeyaml - ESPHome - Home Assistant Community

It draws miliamperes due to reasons you mentioned if you power it via USB port. If powered from battery it’s way more economical in deep sleep, with current draw around 100 uA. The comparison spreadsheet from Andreas Spiess of many ESP32 boards has all the currents actually measured with proper lab equipment

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D1mini and dht22 connection - ESPHome - Home Assistant Community

ESP32 board from Aliexpress yaml config - ESPHome - Home Assistant

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HomeAssistant Temperature & Humidity Sensor with ESPHome