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digitalWrite(INDICATOR_PIN, HIGH); // make
indicator pin HIGH
delay(20); // wait for 20 mSec
}
else
{
lcd.setCursor(0, 1); // set cursor on LCD
lcd.print(âMotion NOT DETECTED.. â);
// print string on LCD
digitalWrite(INDICATOR_PIN, LOW);
//make indicator pin LOW
delay(20); // wait for 20 mSec
}
}
4.2 Interfacing of the NodeMCU with an Analog Sensor
This section describes the interfacing of an analog sensor with the NodeMCU. To demonstrate the working of an analog sensor, a temperature sensor (LM35) is used with the other components. The system comprises of a NodeMCU, a 12V/1Amp DC adaptor, a 12V to 5V and 3.3V converter, a LM35, a liquid crystal display, a 330ohm resistor, and a LED. The objective is to demonstrate the working of an analog sensor, display the information on a liquid crystal display, and switch the LED âonâ or âoffâ.
Fig. 4.3 shows a block diagram of the system.
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