iot & smart home
Tiny Contacts Fits Four Relays Onto a 42 x 38 mm ESP32 Board
Four Omron surface-mount relays on a 42 x 38 mm board, driven by a ULN2003A so your ESP32 GPIO pins never touch a relay…
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Build an ESP32 Water Tank Controller With an Ultrasonic Sensor
An ESP32, an ultrasonic sensor, and a relay turn a manual rooftop water pump into a hands-off system that fills the tank and stops…