Cheap $10 Macro Pad

thingiverse

###A macro pad for under $10. ##Parts Required: - macropadv444.stl (included) *1 - Key_Switch_Tester_4x2.stl from https://www.thingiverse.com/thing:4120804/files by riskable - Arduino Pro Micro (or any other 32U4 based microcontroller) *1 - Cherry MX compatible Switches (I used gateron blue switches) *8 - Cherry MX keycaps (I used https://www.thingiverse.com/thing:2288281/files) *8 - 5mm LEDs (dual colour is also supported) *2 - 100ohm resistors *4 - Wires - Solder - 2mm PVA foam - 1 sheet - A printer (2 dimensional) - Micro USB cable - Double sided tape ##Aliexpress Links: - Switches: https://www.aliexpress.com/item/32980039972.html?spm=a2g0o.productlist.0.0.61842dccx8ussy&algo_pvid=c2cc961b-a046-474d-9074-c3145b3b3ff9&algo_expid=c2cc961b-a046-474d-9074-c3145b3b3ff9-1&btsid=0b0a556816068266191712219eb92b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ - Pro Micro: https://www.aliexpress.com/item/32978678381.html?spm=a2g0s.9042311.0.0.fd4d4c4dNQ62Or - LEDs: https://www.aliexpress.com/item/1868332975.html?spm=a2g0o.productlist.0.0.5e7a753amrqRqZ&algo_pvid=9bd2a24d-fe3a-4698-a512-a0d817964e22&algo_expid=9bd2a24d-fe3a-4698-a512-a0d817964e22-1&btsid=0b0a557016068268425278370e6785&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ - Resistors: https://www.aliexpress.com/item/32526023399.html?spm=a2g0o.productlist.0.0.2a1527cetRDlvj&algo_pvid=f66d5d12-5d56-445c-b81c-088d92789ebd&algo_expid=f66d5d12-5d56-445c-b81c-088d92789ebd-14&btsid=0b0a556f16068268942781706e86e4&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ ## Try and get as much as you can locally for cheaper shipping and to support local business. ##Assembly Instructions: - Attach all switches to the plate - Connect a single wire (preferably bare copper) across one row of 4 switches and solder it to one pin of each switch - do the same for the other row, and connect these 2 together. This will be the ground. - Solder wires from the other pins of the switch to your preferred pins on the pro micro. - Solder LEDs and use resistors as required - Insert the LEDs into the holes - *important* Use a strong piece of double sided foam tape to stick the pro micro to the included mount (3M might be a bit more expensive but it works much better) I've left enough clearance for thicker/thinner tapes - Push the plate into the top. You might need a bit of filing based on your printer. With a well tuned ender 3, I got a perfect snap in fit. - Test whether all buttons are functional. (You can use a simple arduino sketch that prints to the serial monitor when a button is pressed) - Get a sheet of foam, put a thin line of superglue across the bottom of the case, and place it on the foam sheet. It shouldn't take more than a few seconds to dry. - Cut off the excess foam around. - Have a donut because you're done! Wiring Instructions: Connect one side of all switches to ground, and use the Input pullup. LEDs can be connected to the other pins. Once you're done, you superglue a piece of foam to the bottom. If the top plate is too loose, use a bit of PVA glue. You can use any cherry compatible keycaps. I used Keyboard.h, not sharing my code because it's shit and others can probably do better.