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ESP32 Node (WROOM / WT32-ETH01)
Espressif ecosystem · Shanghai / Shenzhen, CN
The $2–8 sensing brain. WROOM-32 boards for WiFi nodes; WT32-ETH01 adds wired Ethernet for metal-cabinet and PoE installs. ESPHome makes every sensor in this catalog's DIY tier declarative.
Data out
MQTT over WiFi or Ethernet · ESPHome / Arduino / ESP-IDF
Price
WROOM boards ¥12–27 · WT32-ETH01 ¥23–26 · ฿150–300 Shopee TH
Sourcing
- ThaiEasyElec / Arduitronics (Bangkok) · same-day via Grab
- Shopee TH · 1–3 days
Links
Gotchas
- Idles 80–160 mA but spikes ~500 mA on WiFi TX — size 5 V supplies ≥1 A, add 470–1000 µF on the rail
- VIN wants 4.8–9 V; never feed batteries into the 3V3 pin
- WiFi dies inside metal cabinets — mount outside or use WT32-ETH01