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Here is the circuit of an Arduino-based Panic Alarm ... check if the input is HIGH digitalWrite(rlyPin, HIGH); // turn Relay ON digitalWrite(ledPin, HIGH); // turn LED ON playTone(500, 600); delay(100 ...
If you are designing your own intelligent “Graden Computer” with an optional digital plant moisture sensor/water pump controller that lights an LED to ... to build a relay-driver circuit. Yes, there ...
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