heART Pendant – A Beating Heart Educational Soldering Kit – STEM

(3 customer reviews)

£12.00 inc VAT

Out of stock

heART Pendant – A Beating Heart Educational Soldering Product – STEM

Learning to solder is an important skill for any budding engineer, hence we have created a range of practical educational soldering product ‘s to make this a fun learning experience. Because this is such a vital skill we have also created the Soldering for Beginners course within our blog

We are extremely proud of all of our soldering kits  and as you progress through them, you’ll start to yern for something more complex! For this reason we designed the heART Pendant STEM soldering kit. The perfect way to try soldering Surface Mount components for the first time. for beginners to get started with surface mount soldering techniques. The project will require you to hand solder 5x 0805 LEDs, 1x 0805 capacitor, an SOIC 8 pin IC, an SMD battery clip and a surface mount switch.

Once these are all soldered in place simply adding a CR2032 battery (not included) will bring this pendent to life and start its heartbeat.

Kit contains:

  • 5 x 0805 Red LEDs + spare
  • An 0805 Capacitor + spare
  • 1 x SOIC ATtiny85
  • One x PCB
  • An SMD switch
  • 1 x CR2032 SMD battery clip


  • Soldering Iron, a fine tip is best but a standard one is usable.
  • Solder, a fine gauge is advantageous but not necessary.
  • Tweezers for holding the components.
  • CR2032 Battery
  • Eye protection, because when you cut the leads, they can ping off at quite a velocity!

How to video:

Additional Info:

If you need further help though you can call our free tech support line. Because we understand that there is no such thing a stupid question.

The battery should last over a week if left on continuously and much longer if switched off when not in use. This is because the surface mount LED’s are extremely low power. This means that you can wear your pendant with pride all week long!

Also please note that we love to follow the tweets online and find out who’s using our cool, educational soldering kits. Hint hint!


If you fancy a bit more of a challenge, know a bit about updating firmware on the ATTiny84 and would like to make your HeART Kit do something cooler, here is the source code for you to tweak!

byte pin = 1;

void setup()

void loop()

void doFadeUp(int speed, int maxBright)
  for (int fadeUp = 0; fadeUp <= maxBright; fadeUp += 5)
    analogWrite(pin,255 - fadeUp);

void doFadeDown(int speed, int maxBright)
  for (int fadeDown = maxBright; fadeDown <= 255; fadeDown += 5)

3 reviews for heART Pendant – A Beating Heart Educational Soldering Kit – STEM

  1. George Cilia

    Easy for to assemble with assistance from YouTube video- my wife loved it.

  2. W Jones

    Dead easy to put together, lovely little thing.

  3. Glyn Harper

    A lovely kit for intermediates to have fun with.
    I put this kit together with my daughter who is 10. She would have struggled with the surface mount elements on her own, but it gave me a chance to explain some more advanced soldering techniques to her.
    When the kit was complete, we were very happy with the results.

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