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Ex No:12 Design An IOT Based System

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7 views3 pages

Ex No:12 Design An IOT Based System

Uploaded by

maniv2769
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Ex no:12

Design an IOT based system

Aim:

To design an IOT-driven system that autonomously modulates LED luminance based on real-
time ambient light intensity measurements acquired through a Light Dependent Resistor (LDR)

Algorithm:

1. Start the system.


2. Set A0 as input pin.
3. Set pin 6 as output pin.
4. Read the analog value from LDR at pin A0.
5. Map the LDR value from range 0–1023 to 0–255.
6. Write the mapped value to pin 6 to control LED brightness.
7. Repeat steps 4–6 continuously.

Program:

void setup() {

pinMode(A0,INPUT); // Set A0 as input

pinMode(6, OUTPUT);

void loop() {

int ldr = analogRead(A0); // Read the value from LDR (Light Dependent Resistor)
int bri = map(ldr, 0, 1023, 0, 255); // Map the LDR value to brightness range (0 -255)

analogWrite(6, bri); // Write the brightness value to pin 6

Output:
Result:

Thus, the experiment to design an IOT-based system that automatically adjusts LED brightness
according to ambient light intensity sensed by an LDR (Light Dependent Resistor) has been
successfully written, executed, and the output has been verified.

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