The topic itself speaks a lot about what this post is about. And with Valentine's day around the corner, I thought I make something special related to this occasion for fun in my free time. And to make something special, I thought to make a LED Heart using the skills which I have amassed over past few years. So, here I am showing off my gift and writing the procedure on how to make is so that you can also try it out !
A quick photo on what you want to make:
Thing required:
1. 14 red LEDs
2. General purpose PCB
3. 5 1K resistors
4. Switch for On-Off
5. 9V battery for power supply
6. Soldering kit which includes soldering rod, solder wire and flux(optional)
Arrange the LEDs on PCB as shown in the figure above. I connected 3 leds in series to make a pair. So in total, I got 4 pairs of 3 each and 1 pair of 2 led. i.e. 4x3 + 1x2 equals to 12 + 2 which equals to 14 leds
A led has 2 legs. The longer one is positive and shorter one is negative.
For a pair, connect the positive leg of 1st led to any leg of resistor and connect the other leg of the resistor to any one side of a switch. The negative leg of the 1st led will be connected to positive leg of the 2nd led in that pair. The negative leg of 2nd led will be connected to positive leg of 3rd led. And finally, the negative leg of 3rd led to ground i.e. -ve of battery.
Each pair uses on resistor and so we have 5 resistors in total. Also, connect all the pairs to same side of the switch.
Connect the other terminal of switch to the +ve of battery.
Therefore, the positive leg of 1st leds of each pair are connected to battery and so they will be in parallel hence will have same voltage across all pairs.
If you know soldering, then it would be best. Else, take some help for soldering because if it is done, then the circuit remains in place and looks neat also.
A note: Test individual leds before connecting in the circuit as you if an led doesn't work then you will have to do a substantial effort for changing the dead led.
Now, toggle the switch and you will see something like this:
A quick photo on what you want to make:
 |
| LED Heart |
1. 14 red LEDs
2. General purpose PCB
3. 5 1K resistors
4. Switch for On-Off
5. 9V battery for power supply
6. Soldering kit which includes soldering rod, solder wire and flux(optional)
Arrange the LEDs on PCB as shown in the figure above. I connected 3 leds in series to make a pair. So in total, I got 4 pairs of 3 each and 1 pair of 2 led. i.e. 4x3 + 1x2 equals to 12 + 2 which equals to 14 leds
A led has 2 legs. The longer one is positive and shorter one is negative.
For a pair, connect the positive leg of 1st led to any leg of resistor and connect the other leg of the resistor to any one side of a switch. The negative leg of the 1st led will be connected to positive leg of the 2nd led in that pair. The negative leg of 2nd led will be connected to positive leg of 3rd led. And finally, the negative leg of 3rd led to ground i.e. -ve of battery.
Each pair uses on resistor and so we have 5 resistors in total. Also, connect all the pairs to same side of the switch.
Connect the other terminal of switch to the +ve of battery.
Therefore, the positive leg of 1st leds of each pair are connected to battery and so they will be in parallel hence will have same voltage across all pairs.
If you know soldering, then it would be best. Else, take some help for soldering because if it is done, then the circuit remains in place and looks neat also.
A note: Test individual leds before connecting in the circuit as you if an led doesn't work then you will have to do a substantial effort for changing the dead led.
The whole project took me 5 hours from thinking to implementation :)
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