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Question: How to build a soft circuit for controlling heat applied to heat-sensitive ink
circuit for heat-sensitive ink - 2 (50%)
heat controlling circuit + heat-sensitive ink + arduino pro mini - 2 (50%)
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Author Topic: circuit for heat controlling with Arduino  (Read 1724 times)
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OK, that's a reasonable resistance and current.

You need a "Logic Level FET" or even a plain Bipolar NPN transistor would probably work fine here....

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Regards, Terry King  ..On the Red Sea at KAUST.edu.sa
terry@yourduino.com  LEARN! DO! (Arduino Boards, Sensors, Parts @ http://yourduino.com

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Thank you.
I will try it once receiving the right mosfet and post the result here.
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Hello all,

I just want to say thanks for your input on my experiment.
The heating circuit is working well with both IRFZ44N (from Mike) and IRL540N mosfets.

The heating element in this experiment is silverthread with ~100Ω resistance. Using thermochromic pigment (operated at 27c) mixed with acrylic colour and painted on t-shirt, the ink fully turns into colourless state within 10-15 seconds. It takes longer than 45 minutes to return to its coloured state. The test was made in 18-20c room temperature.


* heatSensitiveInk_circuit_DSCF7848.JPG (115.98 KB, 640x480 - viewed 11 times.)
« Last Edit: May 11, 2011, 11:17:33 am by sawadee » Logged

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