Overview
Things
Story

WORKING
HARDWARE SETUP
SOFTWARE SETUP
SAMPLE VIDEO

Published September 5, 2020 © GPL3+

Buzzing the buzzer using LDR | BOLT IoT

Do Photons make noise? - Yes, they do. But here we are going to produce noise using a buzzer according to the intensity of light (Photons).

BeginnerFull instructions provided1 hour685

Things used in this project

Hardware components

Buzzer

LDR, 5 Mohm

PHPoC Bread Board

Jumper wires (generic)

Female to male and male to male.

Bolt IoT Bolt WiFi Module

Resistor 10k ohm

Software apps and online services

Snappy Ubuntu Core

Or any Linux based distro.

Bolt IoT Bolt Cloud

Story

This project is all about producing variations of sounds in buzzer according to the intensity of light.

It can also be used as an alert system to get alerted whenever someone enters your room and switches on the light.

Any person provided with the ready hardware and software components can do this project within an hour.

FINAL HARDWARE SETUP

Then

What are we waiting for-?

Let's jump in !!!

HELL YEAH!!

WORKING :

LDR sensor reads the value of the light intensity from the value 0 to 1023.
Buzzer takes the value from 0 to 255 to make variations in the noise it produces.
When we connect these two components with the Bolt Wi-Fi module and combined this with the right software program, we can reach our objective.

HARDWARE SETUP :

STEP-1

Connecting jumper wire from GND in the Bolt Wi-Fi module to the breadboard.

seperating GND connection from Bolt WiFi module to breadboard

STEP-2

Connecting the LDR sensor to the circuit.
One end of the LDR sensor is connected to a 3.3v pin and another end is connected to the pin A0.

connecting one end of LDR to A0 and other end to 3.3v

STEP-3

Connecting the Buzzer to the above circuit.
The buzzer has +ve and -ve pin. The long endpin is known as the +ve pin and the short endpin is known as the -ve pin.

+ve pin to pin number 0 and -ve pin to GND

The positive pin of the buzzer is connected to pin number 0, and the negative pin of it is connected to GND.

STEP-4

Connecting the 10kohms resistor to the circuit so that it forms a potential divider circuit across the LDR which allows MCU to read the voltage across the LDR.

10k Ohm resistor connected between A0 and GND.

One end of the resistor is connected to the pin A0 and the other end is connected to GND.

STEP-5

Connecting the Bolt IoT Wi-Fi module to the Bolt IoT cloud.

final circuit connection

Now after every 10sec, the LDR sensor senses the intensity of the light to give the input to the Buzzer.
The can be given from 0 to 1023, but the buzzer can only receive the input from 0 to 255.
So we must divide the input value obtained from LDR by 4 so that the input values from 0 to 1023 can be converted to 0 to 255.

SOFTWARE SETUP :

STEP-1

Installing python library in Ubuntu 20.04 / or any other Linux distros.

sudo apt update

sudo apt install python3-pip

STEP-2

Writing a program using the terminal of ubuntu. here

SAMPLE VIDEO :

This video shows the variation in the sound of the buzzer when there is a flashlight and when it's off.

variation of sound according to the intensity of light.

Feel free to comment down below to ask any doubt/question regarding this project.

Code

Coding Part

import json, time                 # importing libraries
from boltiot import Bolt

# api_key and device_id of the Bolt Wi-Fi module
bolt_api_key = '8d87411e-xxxx-xxxx-xxxx-xxxxxxxxxxxx'   
device_id = 'BOLTxxxxxxx'                 

nbolt = Bolt(bolt_api_key, device_id)

# defining the function to produce sound in buzzer
def noise_maker(pin, value):
	response = nbolt.analogWrite(pin, value)
	print (response)

# creating the infinte loop so that program can run until we press 'ctrl+c' 
while True:
	response = nbolt.analogRead('A0')
	data = json.loads(response)
	try:
		intensity = int(data['value'])
		intensity = int(intensity/4 - 1)  #converting the input(0 to 1023) to output(0 to 255)
		
		print ("Light intensity is ",intensity)
		noise_maker('0', intensity)   # calling function noise_maker
		
		time.sleep(3)         # buzz for 3 sec
		noise_maker('0', 0)  # switching off buzzer
	except Exception as e:
		print ("Error ", e)
	time.sleep(10)          # receiving the input from LDR after every 10 sec

Credits

Basavesh MP

2 projects • 3 followers

Thanks to Rahul Singh.

Buzzing the buzzer using LDR | BOLT IoT