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I made my electricity meter smart for <10€ with ESPHome, an ESP8266 and a TRCT5000 IR sensor : r/homeassistant
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CHANZON 20 pcs Pre-Wired 3mm RGB Fast Blinking LED Diode Lights (Clear Round Transparent Lens DC 12V) with 560 ohms 1/4W Resistor and 24awg Wire Indicator Light Emitting Diodes Bulb Lamp: Amazon.com:
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