keyboh_bom.txt

KEYBOH Bill Of Materials

1) Component to be soldered on the PCB
2) External components

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1 - Component to be soldered on PCB

Part			Value											Notes
S1 to S20		tactile switch 12mm								Square keycap if you'll 3d print the provided faceplate
R1				leave empty										10K for devices without integrated pull-up resistors
R2				leave empty										10K for devices without integrated pull-up resistors
R3				* 1nF ceramic capacitor							10K resistor for devices without integrated pull-up resistors
R4				* 1nF ceramic capacitor							10K resistor for devices without integrated pull-up resistors
R5				as needed by I2C if you use it					4.7K to 10K depending I2C slave requirements
R6				as needed by I2C if you use it					4.7K to 10K depending I2C slave requirements
R7				** close or 22K									close if you use original Arduino Leonardo
R8				** empty or 15K									leave empty if you use original Arduino Leonardo
ENCODER			rotary encoder
THUMBSTICK		PS2-like analog thumbstick
H1				male pinheader 10pin							Arduino header - solder on top
H2				male pinheader 8pin								Arduino header - solder on top
H3				male pinheader 8pin 							Arduino header - solder on top
H4				male pinheader 6pin 							Arduino header - solder on top
UART			male pinheader right angle 4pin                 Optional
I2C				male pinheader right angle 4pin                 Optional
EXT1			male pinheader right angle 3pin                 Optional

* Those 2 placeholders was originally intended for mounting resistors when using keyboh with microcontrollers don't have internal pull-up resistors. With Arduino Leonardo resistors are not needed and you must mount 1nF ceramic capacitors for improving the encoder response. Mounting capacitors and using the provided debounce functions in the examples, the response of the encoder is very good

** Those 2 resistors are used only in the case you use an Arduino Compatible board running at 3.3V and the device on UART connector
works at 5V, in that case two resistors forms a voltage divider that consent to receive a 3.3V signal on RX pin of Arduino.
If you use a 3.3V Arduino Leonardo or other device, you must also change the SJ1 solder jumper setting, and eventually disconnect
also the SJ2, SJ3 and SJ4 solder jumpers or simply don't use the 5V pin if not needed

2 - External components

1x	Arduino Leonardo original board