A little update on what we have been doing.
The first test of thermochromic textiles. We tried to test different materials as the heating element. These small patches were woven by hand with various metallic threads and silk thread dyed with the thermochromic ink.
Here is the actual thread we are going to use:
The picture below shows us measuring the length and type of resistance wire we can use. We had two types of wire: 0.3 mm and 0.4 mm. It seems that we need about 300 mA of current to heat the wire to a point where it reacts with the threads dyed with thermochromic ink.
The lengths of wire we can use with a 9V battery:
- ~ 4 meters of the 0.3 mm wire
- ~ 5 meters of the 0.4 mm wire
A 9V battery is not really the ideal option since it would drain out really fast when we use 300 mA., but we also need the higher voltage. I think we need to use a bigger LiPo or NiMH battery (7.4V or 11.1V).