bm68rgb bluetooth mod
author: captmicro
2 layer board of 2.40 x 0.65 inches (61.0 x 16.5 mm)
Uploaded:
November 17, 2021
Shared:
November 17, 2021
Total Price:
$7.80
Convert bm68rgb keyboard from ATMega32U4 to NRF52 using a MDBT50Q module.
ORDER AS FLEX PCB
ATMega32U4 footprint is flipped & mirrored so you can bend the flex PCB 180 degrees and solder onto the footprint on the keyboard. Couldn’t find a way to automatically switch over to battery, so a SPDT switch is required
OSHPark does not show the board cutout correctly for the ATMega32U4 footprint
BOM
ICs
- U1: just a footprint, DO NOT PLACE
- U2: MDBT50Q-P1MV2 (maybe -1MV1 is chip ant. fits?)
- U3: BQ24012
- U4: ADP2504ACPZ-5.0-R7
INDUCTORs
- L1: 10uH 80mA 10% (0603)
- L2: 1.5uH min 1A low R (1008) I use a Murata Electronics DFE252012P-1R5M=P2 2.6A 1.5uH ±20% 60mΩ 1008 Inductors (SMD) ROHS
CAPs (all 0603, rated >5V)
- C1,C2,C3,C4: 10uF
- C5: 22uF
- C6: 0.47uF
- C7: 0.1uF
RESISTOR (0603)
- R1: 9.09k or 2.26k (100mA or 500mA charge current)
SWITCH
- SW1: JS102011SAQN
Convert bm68rgb keyboard from ATMega32U4 to NRF52 using a MDBT50Q module.
ORDER AS FLEX PCB
ATMega32U4 footprint is flipped & mirrored so you can bend the flex PCB 180 degrees and solder onto the footprint on the keyboard. Couldn’t find a way to automatically switch over to battery, so a SPDT switch is required
OSHPark does not show the board cutout correctly for the ATMega32U4 footprint
BOM
ICs
- U1: just a footprint, DO NOT PLACE
- U2: MDBT50Q-P1MV2 (maybe -1MV1 is chip ant. fits?)
- U3: BQ24012
- U4: ADP2504ACPZ-5.0-R7
INDUCTORs
- L1: 10uH 80mA 10% (0603)
- L2: 1.5uH min 1A low R (1008) I use a Murata Electronics DFE252012P-1R5M=P2 2.6A 1.5uH ±20% 60mΩ 1008 Inductors (SMD) ROHS
CAPs (all 0603, rated >5V)
- C1,C2,C3,C4: 10uF
- C5: 22uF
- C6: 0.47uF
- C7: 0.1uF
RESISTOR (0603)
- R1: 9.09k or 2.26k (100mA or 500mA charge current)
SWITCH
- SW1: JS102011SAQN
