Learn How to Develop Smartness to the LED in 30 mins

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DEVELOP SMARTNESS TO THE LED

we have simply learned about to glow the LED by using SWITCH, now we go ahead to put the automation on it to make it smart.

LED will be ON at darkness and OFF when there is a particular intensity of light in the room, we can adjust at What intensity should LED be on and OFFi

simply we will deal to convert the ANALOG to binary DIGITAL signal output, by comparing analog signal to reference signal. 

DEVELOP SMARTNESS TO THE LED

STEP-1 :- Things required 

  •  9 volt dc power source.
  •  voltage regulator IC [7805].
  •  light dependent resister [LDR].
  •  comparator IC [LM358].
  • potentiometer [10k ohm].
  • 3mm /5mm led .
  • resister [270 ohm, 10k ohm].
  • multimeter. 
  • bread board and jumper wires [red,blue,yellow].
  • screw driver.

STEP-2 :- Circuit and components connection

DEVELOP SMARTNESS TO THE LED
Figure 2. 1
  • voltage regulator:- 7805 ic which gives the 5-volt output  when giving it to +6 volt 
  • comparator:-  LM358 dual comparator ic each comparator compares two variable voltage and gives the output LOW (0) and HIGH (1) voltage.
  • potentiometer:- it is a manual variable resistor, it is used to set the reference voltage at the negative terminal of the comparator ic.  
  • LDR:-  (light dependent resister ) its resistance vary according to the intensity of light fall on it, it is used to detect the intensity of light.

STEP-3 :- Implement on bread board

  • put all the components on the bread board, as  shown in the figure below. 
DEVELOP SMARTNESS TO THE LED
Figure 2. 2
  • connect 2nd terminal of the 7805 ic to upper BLUE row and the 3rd terminal connect to RED row of the bread board. [ RED  row show +5 volt. with refrence BLUE row that is NEGATIVE row ]. 
  • connect the both upper RED and lower RED rows, and also BLUE to BLUE rows.
  • jump the 4th terminal of LM358 to lower BLUE  row and 8th  pin to upper RED  row by using jumper.
DEVELOP SMARTNESS TO THE LED
Figure 2. 3
  • connect the potentiometer 1st  and 3rd   pin to positive and negative row respectively, 2nd  pin connect with the 6th pin of comparator ic by yellow wire.
  • one terminal of LDR  is connected to the positive row, and second connect with  one terminal of resister to  PIN 7  and second terminal of 10k ohm resister is connect to the BLUE  row.
DEVELOP SMARTNESS TO THE LED
Figure 2. 4
  • connect the resister to the positive  row and the positive terminal of the LED
  • negative terminal of LED put at the output of the comparator ic [PIN  5]
DEVELOP SMARTNESS TO THE LED
Figure 2. 5
  • check the circuit continuity and also check short circuiting at positive and negative rows by using multimeter.
  • if getting continuity  at positive and negative than check the connection properly. and don’t connect the battery at this condition.
  • finally connect the positive terminal of battery to  1st pin and negative to  2nd pin of the 7805 ic.
DEVELOP SMARTNESS TO THE LED
Figure 2. 6
  • after connect  battery,  set the potentiometer  through  screw driver, led  may be ON or  OFF .
  • if led is OFF,  at this situation turn the potentiometer  at one direction  or other until  led will turn ON. and than turn pot on reverse direction as it was rotating  until at the point  where the led get turn  OFF.
  • if  led is ON, than turn the potentiometer at one direction or other until  at that point where led is turn OFF.

STEP-4 :- Test the result  of the circuit  

  • after the proper set up we observed that whenever the LDR  in darkness than the LED turns on automatically and turns OFF  when it goes to under the light. 
  • we can set, the intensity at which we want to turn the led off and on by rotate potentiometer.  

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