Day 4: LED card (a glowering ninja) and squishy circuit
Today is Sunday. I spent most of my afternoon and evening hacking led cards. At the end of it, we (me and Emma) made squishy circuits with play-doh.I used to love chunky clumsy cheerful colorful flashy LED cards that plays music. Though those cards always inevitably worn out and became wires-intruding miserable eye-sores.
I still want to learn how to do it, since now I am interested in wires, LEDs and electronic sort.
There are quite some tutorials on YouTube, the basic ideas are building a circuit with a button battery, cooper wires, and Led, as the following.
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| Image from https://www.youtube.com/watch?v=c_ApyKqqctM |
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| LED ninja card |
And this one:
Though somehow my card always seems a little shaky, light does not always automatically turn on. I still have not been able to find a reliable way to connect them.
Squishy Circuit
Emma showed the TED talk of squishy circuit made out of home made salty (conductive) dough and sugar (insulating) dough. We decided to give it a try. We also soaked in all of the tutorials at here.
Emma made the dough, light pink - conductive, earthly muddy/dark blue - insulating. We started testing with our little 3v button batteries. hmm, the LEDs barely lit up.
I furthered tested with 9v battery, all lights went off. Dead.
Eventually i switched some 6v battery pack. Bravo, it worked. We have 5 beautiful LEDs lit up.
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| Squishy dough circuit. Yeh, our leds are lit up |
oh well.
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