License

BSD

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Numbers etc.

10 months ago 969
  • Description
  • Documents
  • BOM
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Description

Cherry MX hotswap bluetooth numpad/macropad

Designed for the nrfmicro dev board. Supports both coin cell (rechargeable LIR2032) and ordinary LIPO batteries. Since the nrfmicro is pin-compatible with the Pro Micro, this keyboard should work just fine with an ordinary Pro Micro instead (although this is untested).

Firmware for this keyboard is here: https://github.com/chasingendgame/qmk_firmware/tree/chasingendgame in Keyboards/numbersetc_ble

The firmware is based on sekigon's excellent nRF52 branch of QMK.

All components except the (23x) kailh hotswap sockets are thru-hole (20x 1N4148 diodes, coin cell holder, optional JST connector for the LIPO battery, and the nrfmicro).

Includes three different plate designs. Supports both costar and cherry stabs (plate mount only). Connect the plate to the PCB using 6x 8mm M2 screws & nuts, 3mm M2 standoffs and 0.5mm M2 washers.

Battery life is about one hour per 1mah. So a 40mah LIR2032 coin cell battery will last about 40 hours between charges (takes one hour to charge).

IMPORTANT: In its default configuration, the LIPO charger on the nrfmicro will charge at 200ma. This is fine for a large rectangle LIPO battery (200mah+). If you want to use a coin cell battery, you must swap the resistor labelled 4.7K (5.1K) with a 50K resistor instead to slow down the charging. (The footprint for this resistor is 0603 but an 0805 will fit if you're careful. You can also piggy back two 100Ks if you don't have a 50K, this works fine too). But whatever you do, do NOT use CR2032 non-rechargeable coin cell batteries in this keyboard.

Documents

NumbersEtc_Sheet

NumbersEtc_PCB

NumbersEtc_NumPadPlate

NumbersEtc_MacroPlate

NumbersEtc_KbPlate

BOM

ID Name Designator Footprint Quantity
1 NO D18,D17,D19,D16,D14,D13,D15,D12,D10,D9,D11,D8,D6,D5,D7,D4,D3,D2,D20,D1 1N4148 20
2 NO S18,S17,S19,S14,S13,S15,S12,S10,S9,S11,S6,S5,S7,S4,S3,S2,S1,S20,S8,S16,S5-2,S13-2,S20-2,S1-2,S9-2,S4-2 KAILH_MX_SOCKET 26
3 CR2032 THRU HOLE COIN CELL RETAINER BAT CR2032 THRU HOLE COIN CELL RETAINER 1
4 M2 PLATED HOLE WITH MINI HOLES H1,H2,H3,H4,H5,H6,H7,H8 M2 PLATED HOLE WITH MINI HOLES 8
5 nrfmicro U1 SPARKFUN PRO MICRO 1
6 SIP-2.0MM-2P-JST-H7.7 JST SIP-2.0MM-2P-JST-H7.7 1

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