The thermochromatic T-shirt is bought at American Apparel. Embroidering conductive thread with a sewing machine and then applying a current to it results in a color difference on the shirt (due to heating of the wire).
To prevent a short circuit at the cross-sections within the “H” and the “G” I simply jumped a few stitches and stuck some isolating tape between the wires.
- square box fitting the full word = 150×40 mm
- length of thread writing the word: ~ 500 mm
- Nice appearance: 4V > 0,177 mA
- Starting to fade, but still visible at: 3V > 0,124 mA