- nordic nrf51822_qfaa processor (16k ram, 256k flash)
- 32MHz crystal oscillator
- oled, ssd1306, i2c, 64 x 48 ?
- GT20L16P1Y, SPI, unicode charset graphic rom?
- touch button, capacitive sensing
- heart rate led/photodiode sensor, analog
- probably sc7a20 accelerometer (kionix kx022 pinout, but with lis3dh/lis2dh registers/interface?)
| nrf51_gpio | device | device_pin | note |
|---|---|---|---|
| 0 | oled | 12 | reset (active low) |
| 1 | battery voltage | via resistor divider network | |
| 2 | hr led flex cable | 4 | not connected |
| 5 | hr analog pulse | agc pulse corresponding to hr | |
| 6 | charging indication | low when 5v charging connected | |
| 7 | hr green led | high: led on | |
| 8 | accel | sdo/addr | |
| 9 | accel | sdi/sda | |
| 10 | accel | scl | |
| 11 | accel | nCS | |
| 12 | accel | INT1 | |
| 13 | accel | INT2 | |
| 14 | hr led flex cable | 5 | not connected |
| 15 | vibrator | ||
| 16 | touch sensor | cap sensitive touch, active low | |
| 17 | GT20L16P1Y | sclk | |
| 18 | GT20L16P1Y | csn | |
| 19 | GT20L16P1Y | so | |
| 20 | GT20L16P1Y | si | |
| 21 | oled | sda | |
| 22 | oled | scl | |
| 24 | oled | 6 | controls oled power (charge pump?) via npn to pnp bjt (low enabled?) |
Sir, my lynwo i8 smart watch is not paring up with the 3rd party apps. Please help me to connect with the suitable app. Thank you