I recently completed my second internet connected book, embedded with a Photon microcontroller.
Internet Connected Book Model 2
The conductive fabric on this iteration has a more uniform look, because I made an effort to cut all of the strips the same width.
I used a paper circuit, clipped to the conductive fabric with an alligator clip, to test each connection.
While I started out using the same code that I composed for my first book, I've tweaked it in a variety of ways, to achieve different effects and play different music.
Nine pages of this book are illustrated/ animated with the help of paper circuits, compared with only six in my previous model.