TikTok creator @thelma_duku used an old mop stick for their holder, but you can also repurpose an old broom handle. Any wood, metal, or plastic rod that fits through the toilet paper roll will work.

And to that end, we present his IoT toilet sheet tracker. His 3D printed roll holder has a Hall effect sensor that counts revolutions of the roll and sends it to a NodeMCU. The number of sheets ...