It's why DIY smart home projects suddenly got cheap (and actually doable) ...
Rolling back those sands of time.
The hardware was assembled by connecting the Arduino UNO R4 WiFi, the PZEM 004T, the current transformer, and the OLED ...
SparkFun Thing Plus - ESP32-C5 is an Adafruit Feather-compatible board with dual-band WiFi 6, BLE, 802.15.4 radio, and LiPo battery support ...