Wireless Symmetry Optical Keyboard
6*7 keys of each side, low profile optical switch
Dimension: 133 * 137 * 14.35 mm
Weight of each side: 159 ± 1 g
power input: DC 5V 500mA
| tr | tf | unit | |
| pt | 18 | 5 | us |
The speed of optical switch depends on the speed of finger, the shortest time for finger to press a switch is about 200 us, but usually it takes a few milliseconds. Test on mcu’s adc at f_adc = 12MHz, f_s = 12 / 14 MHz, resolution = 12 bits. Get the average of the five.
fn1: switch layout
fn2: switch connection mode. long press: rf Unbind with dongle
fn3: battery status
fn4: power on led green. power off led red.
- usb1 to connect with pc
┌────┐
│ pc │
└▲──▲┘
│ │
┌───usb────┘ └────usb───┐
│ │
┌───▼──┬──────┐ ┌──────┬──▼───┐
│ usb1 │ usb2 │ │ usb2 │ usb1 │
├──────┴──────┤ ├──────┴──────┤
│ left │ │ right │
└─────────────┘ └─────────────┘
- usb2 to connect between left and right
┌────┐ ┌────┐
│ pc │ │ pc │
└▲───┘ └───▲┘
│ │
┌───usb────┘ └────usb───┐
│ │
│ ┌───usb────┐ ┌───usb────┐ │
│ │ │ │ │ │
┌───▼──┬───▼──┐ ┌──▼───┬──────┐ ┌──────┬───▼──┐ ┌──▼───┬──▼───┐
│ usb1 │ usb2 │ │ usb2 │ usb1 │ │ usb1 │ usb2 │ │ usb2 │ usb1 │
├──────┴──────┤ ├──────┴──────┤ ├──────┴──────┤ ├──────┴──────┤
│ left │ │ right │ │ left │ │ right │
└─────────────┘ └─────────────┘ └─────────────┘ └─────────────┘
┌────┐
│ pc │
└─▲──┘
│usb
┌──▼───┐
┌─wireless─►dongle◄─wireless─┐
│ └──────┘ │
│ │
┌─▼───────────┐ ┌───────────▼─┐
│ RF │ │ RF │
├─────────────┤ ├─────────────┤
│ left │ │ right │
└─────────────┘ └─────────────┘
┌────┐
┌─wireless──► pc ◄──wireless─┐
│ └────┘ │
│ │
┌─▼───────────┐ ┌───────────▼─┐
│ BLE │ │ BLE │
├─────────────┤ ├─────────────┤
│ left │ │ right │
└─────────────┘ └─────────────┘
┌────┐
│ pc │
└▲───┘
│
┌───usb────┘
│
│ ┌─wireless─┐
│ │ │
┌───▼──┬───▼──┐ ┌──▼───┬──────┐
│ usb1 │ RF │ │ RF │ usb1 │
├──────┴──────┤ ├──────┴──────┤
│ left │ │ right │
└─────────────┘ └─────────────┘
auto power on/off when usb cable connected/disconnected
when idle for a week, first use fn4 to power off in firmware, then turn off hardware power switch
- qwerty
- pcb 1.6mm thickness
- plate 1.2mm thickness
- nut m2 length 2.5mm, od 3mm
- screw m2 length 4mm
- rubber 1mm thickness
- li-on battery 101550 800mAh, molex picoblade 3 pin, 8 cm cable length
- usb-c to usb-c cable 1 m
- usb-c to usb-a cable 2 m
- Install switches on the plate, the LED position of the switch is facing upwards.
- Install the plate to the PCB.
- Install the screws.
- Install keycaps.
