What are the benefits
HARDWARE CONNECTIONS
Here are some Images of the connection
Sample Python Output
SETTING UP IFTTT (for VOICE AUTOMATION)
GOOGLE ASSISTANT OUTPUT
VIDEO OF CHANGE IN LED INTENSITY WITH CHANGE IN INTENSITY OF LIGHT
COMPLETE PROJECT PDF

Published July 31, 2019 © GPL3+

Light Automation Using LDR & IFTTT

An automatic system built on BoltIoT platform which controls the Light Intensity automatically itself or By using Voice Commands.

IntermediateFull instructions provided1.5 hours1,179

Things used in this project

Hardware components

Bolt IoT Bolt WiFi Module

USB-A to Micro-USB Cable

LDR, 5 Mohm

LED (generic)

Resistor 10k ohm

Resistor 330 ohm

Male/Male Jumper Wires

Breadboard (generic)

Software apps and online services

Snappy Ubuntu Core

IFTTT Maker service

Google Assistant SDK

Story

Have you ever wish that you control the intensity of the light glowing in your room light like we can control the speed of a fan, and even more better the lights can control itself automatically according to the light actually needed in the room because your room is already getting some light from the sun and other reflecting sources, In that case we want a light intensity in room that is actually required from the LED's .

If you want to Switch on and lights with full brightness and also to turn it off with your mobile device rather than go to switch board, This project covers that also.

We don’t know but we actually waste a lot of electricity in our home just because we don’t have a system which control the brightness of the lights in your room.

This Project Solves this problem.It will make your Lights Fully Automatic that adjust itself on its own and can be control with your voice command on your Mobile Device.

What are the benefits?

This will not only make your room lights smarter but is very beneficial to SAVE! Electricity Consumption, and hence your money.

This mechanism is very suitable for street-light control and also the road lights which shows directions in night.

HARDWARE CONNECTIONS

A.CONNECTING LED

1. Connect –ve terminal of LED to GND pin of WiFi Module.

2. Take a 330k Ohm resistor and wrap any terminal of resistor around +ve terminal (long one) of LED.

3. Connect the other terminal of LED to GPIO PIN 1 of WiFi Module.

B.CONNECTING LDR

1. Connect any terminal of LDR to 3.3V pin of WiFi Module.

2. Connect other terminal of LDR to A0 pin of WiFi Module.

3. Take a 10k Ohm Resistor and connect any terminal to GND pin.

4. Connect other terminal of resistor to 'A0' pin.

NOTE: Do all the connections on a breadboard without connecting to the Power Supply and cross-verify connection atleast once.

Here are some Images of the connection

CHECK THE CODE SECTION FOR COMPLETE CODE

Sample Python Output

SETTING UP IFTTT (for VOICE AUTOMATION):

STEPS TO FOLLOW:-

1. Browse to https://ifttt.com/ and create a account.

2. Log in to your account.

3. Click onifThisThenThat.

4. Click on +This.

5. Search Google Assistant and click on it.

6. Click on Say a Simple Phrase and in next window type the commands you will speak and the response text from google assistant to switch on and off the lights and create trigger.

7. Now Click on +That.

8. Search forWebhooks and click on that.

2. On next window Click on Make a Web Request.

3. In URL field paste https://cloud.boltiot.com/remote/44b2de6b-7e68-40e7-a27f-814b58afe008/digitalWrite?pin=1&state=HIGH&deviceName=BOLT13819450.

Here, Replace the API& DEVICE-NAME with your Bolt CloudAPI_KEY AND YOUR BOLT MODULE NAME.

Pin= “THE GPIO PIN with which your LED is connected”

State=”HIGH”-to turn on LED & “LOW”-to turn off the LED

4. Method will be GET to make a request.

5. Left the other fields blank and click on CREATE ACTION and FINISH.

6. Your applet is now ready to use.

NOTE: Create an applet on the account on which you will be going to use Google Assistant.

To make only Voice Controlled LED AUTOMATION Refer to this Project at Hackster.io.

https://www.hackster.io/nitro/5-minutes-4-steps-and-ok-google-turn-on-the-lights-cedc45

GOOGLE ASSISTANT OUTPUT:

VIDEO OF CHANGE IN LED INTENSITY WITH CHANGE IN INTENSITY OF LIGHT

https://drive.google.com/open?id=1pG3tRD529Ra7HzXLVeuhgrWwAkm-hJpW

COMPLETE PROJECT PDF

https://drive.google.com/open?id=1r3KY4QsXqHrcsLvA2_xCGgcSErL5NMOX

Code

Light_automation_LDR.py

"""impoting libraries
    conf to import api_key and device_id written in conf.py
    Bolt for connecting to our bolt module using api_key and device_id
    json to convert data from sensor into json format [key:value]
    time to read value after equal interval of time
"""
import conf
from boltiot import Bolt
import json, time 


mybolt = Bolt(conf.API_KEY, conf.DEVICE_ID)

"""creating a function to set the value of LED automatically(0-255)
"""

def set_intensity(pin, value):
	mybolt.analogWrite(pin, value)

"""create a function to calculate Required LED Intensity
   corresponding to the LDR sensor value
   subtract from 255? - if LDR value=1024(sufficient light)-led will be off(0)
                        if LDR value=0(no light)-led will be on(255)
   intermediate value of LDR will corresponds to a specific LED intensity value(0-255)
   """

def converter(sensor_value):
	led_intensity= 255-(sensor_value*255/1024)
	return led_intensity


while True: 
    print ("Reading Sensor Value")
    response_ldr = mybolt.analogRead('A0') # Read the LDR Sensor Value from A0 Pin
    data = json.loads(response_ldr)   # Convert value in Json format 
    print("Sensor value is: " + str(data['value'])) # Print the value
    try: 
        sensor_value = int(data['value'])
        print("Calculating required Light Intensity for LED")
        led_value_float=converter(sensor_value)  # convert ldr sensor value in required
        led_value= int(led_value_float)          # led value in float and then typecast 
        print(led_value)                         # float into int type
        set_intensity('1',led_value)             # this will make LED to glow
                                                 # with calculated intensity value

# in case of any error encountered        
    except Exception as e: 
        print ("Error occured: Below are the details")
        print (e)
    time.sleep(15)