Bluetooth page turner
Description
So I just got myself an iPad Pro, mainly to read sheet music from it. The first thing that comes to mind when using a tablet to read music is: "How do I turn pages on this thing? Is there a better solution than just swiping around while playing?". Obviously the answer is: "Yes, with [*another expensive gadget that is already on the market*](https://www.thomann.de/it/airturn.html)". Being cheap as I am (the iPad is a reconditioned one, and still really too expensive for me), I decided to try design one, using an ESP32, a lipo battery charger circuit and a couple other components. This is the result (up until now), hope you like it! ## Parts needed: * ESP32 board, I used a ESP-WROOM-32 after removing all the header pins, to have a shorter board. Going back I would have used a board with an integrated charging circuit, like a [Lolin32](https://it.aliexpress.com/item/33006577783.html?spm=a2g0o.productlist.0.0.7ccb58a6xTtykC&algo_pvid=e232b403-1504-4679-a534-d3c7af5d4a1a&algo_exp_id=e232b403-1504-4679-a534-d3c7af5d4a1a-0&pdp_ext_f=%7B%22sku_id%22%3A%2267077753905%22%7D&pdp_pi=-1%3B2.84%3B-1%3BEUR+1.51%40salePrice%3BEUR%3Bsearch-mainSearch) * [Lipo battery charging circuit ](https://it.aliexpress.com/item/32649780468.html?spm=a2g0o.productlist.0.0.4ceb12d0sOOGEJ&algo_pvid=b8c24cfb-3dc5-476e-a609-2dc662e7f070&algo_exp_id=b8c24cfb-3dc5-476e-a609-2dc662e7f070-2&pdp_ext_f=%7B%22sku_id%22%3A%2266766304851%22%7D&pdp_pi=-1%3B0.38%3B-1%3BEUR+0.99%40salePrice%3BEUR%3Bsearch-mainSearch) (not necessary if using a Lolin32 or similar) * [Lipo battery](https://it.aliexpress.com/item/1005001302867960.html?spm=a2g0o.productlist.0.0.250e4987h4uKME&algo_pvid=21002eb9-502d-45df-8985-e35a4871e38d&algo_exp_id=21002eb9-502d-45df-8985-e35a4871e38d-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000015637203226%22%7D&pdp_pi=-1%3B4.32%3B-1%3B-1%40salePrice%3BEUR%3Bsearch-mainSearch). I used a 2000mah battery, which is really too big for a project like this, but I already got it for another project, so why not (a smaller sized battery would have been more appropriate). * [USB C breakout board](https://it.aliexpress.com/item/1005002795893679.html?spm=a2g0o.productlist.0.0.250a5430u1IB1a&algo_pvid=d2fc7d0b-4bfc-4c66-89fb-4e1cb42c8d89&algo_exp_id=d2fc7d0b-4bfc-4c66-89fb-4e1cb42c8d89-0&pdp_ext_f=%7B%22sku_id%22%3A%2212000022223535178%22%7D&pdp_pi=-1%3B1.47%3B-1%3BEUR+1.21%40salePrice%3BEUR%3Bsearch-mainSearch) * 2x [tactile microswitches](https://it.aliexpress.com/item/32703700668.html?spm=a2g0o.detail.0.0.7d877809atNrp9&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.169870.0&scm_id=1007.13339.169870.0&scm-url=1007.13339.169870.0&pvid=cb37abe4-1090-43ca-9280-29883d5b13bc&_t=gps-id:pcDetailBottomMoreThisSeller,scm-url:1007.13339.169870.0,pvid:cb37abe4-1090-43ca-9280-29883d5b13bc,tpp_buckets:668%232846%238110%231995&pdp_ext_f=%7B%22sceneId%22:%223339%22,%22sku_id%22:%2260840568943%22%7D) * 1x [SPDT switch](https://it.aliexpress.com/item/32846701300.html?spm=a2g0o.productlist.0.0.4d43ddddiv2moS&algo_pvid=05fc1961-c077-4ee9-92ab-acc1583bad64&algo_exp_id=05fc1961-c077-4ee9-92ab-acc1583bad64-0&pdp_ext_f=%7B%22sku_id%22%3A%2265208105406%22%7D&pdp_pi=-1%3B8.72%3B-1%3BEUR+3.72%40salePrice%3BEUR%3Bsearch-mainSearch) (I had one laying around, so I linked to a kit with a bunch of them, just to be sure one of those would fit) * 3x self tapping screws ## On the design: I will be honest, to fix the electronics to the bottom cover, I shamelessly choose the lazy approach, hotgluing everything into place, eyeballing the alignement of the spdt switch and the usb breakout board. The light coming from the onboard leds (2 on the charging circuit and 2 on the ESP32) is transferred to the front panel through some transparent filament (optic fiber like), shaped as needed and soldered into place. Since the placement, size and shape of these small pieces of filament depends on the choosen boards and their alignement, I decided not to include those in the design, since my solution will most probably not be compatible with any other attempt at this design. The masking tape visible in the top-shell photo is there just to block some of the light emitted by the onboard leds. Printing in black PLA should be enough to block all the light. I know the color scheme *is not exactly wonderful* for something that is going on stage, so I think I will spray paint it soon and print the buttons again in black TPU.
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