I'm not sure if this will help since it sounds a bit different than what I experienced, but try changing the battery. Our copy had some odd behavior when it started dying, but hadn't completely failed yet.
Just to update this thread and correct myself. The book is absolutely fine. The problem was we were using it at bedtime with dimmed bedroom lighting. When we turn the bedroom lights back on, the book works fine again!
Is it that the reflection of the already-on LED (or maybe external light at the right angle) is hitting the sensor used for NOT and then creating a feedback loop to keep the light on when the switch isn't pressed? This happened a few times, and either changing the ambient light or holding the book tightly shut will resolve the issue on my copy.
edit: because the author is here, thanks for the book: an interesting idea and well-executed. Daughter doesn't mind the front page blue LED. I am more amused than annoyed: even a two-transistor circuit needs debugging sometimes.
I can attest my copy has the same error- the blue light page is the NOT gate, which doesn't require a button press. Perhaps a dying battery or decalibrating light sensor thinks it's on the NOT page?
Same here. Both copies I ordered were not working on arrival. I tried to switch the batteries but they were really stuck in there (can’t easily remove them without bending/breaking), eventually got them out and replaced them but one of the copies still didn't work. Reached out to the creator but he just said try swapping the batteries. I still think the idea of the book is great, just wish the execution and support were better.
