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I think one dongle would cost around 15usd if you order everything from aliexpress. The pcbs are really cheap to print but there is also shipping. So the price is assuming that you order them at the same time as your keyboard pcbs. https://github.com/durken1/pierce/tree/develop here's a bill of materials. You need 1 pierce reciever pcb, 1 pro micro, 1 wireless module, 2 4.7k smd resistors, 1 3.3V regulator and a momentary switch for each dongle. Everything except the pro micro and the wireless module sells in packs. So it really is those that will be the bulk of the cost when making several.
The redox keyboard has a short explanation written in the wireless implementation section here: https://github.com/mattdibi/redox-keyboard. But basically the dongle is built with a pro micro and a wireless module. The wireless module on the dongle receives the matrix from the two modules on the keyboard halves which are powered by coin cell batteries. Not sure why you don't see more keyboards using this solution.
My keymap is basically a modified version of manna-harbour's miryoku layout. Here's the keymap if you want to take a look. https://github.com/CarlFabian/qmk_firmware/blob/master/keyboards/chonky_bois/keymaps/gurtmail/keymap.c
if you have access to a 3d printer you can also make double sculpted keycaps with my library. Choc stems are quite difficult to print though, your best bet is a resin printer
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