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zerog2k/lynwo_i8_description.md

Last active June 24, 2021 04:52
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Lynwo i8 bluetooth smart watch fitness band with heart rate sensing
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lynwo_i8_description.md

LYNWO I8 watch

product url

https://www.banggood.com/LYNWO-I8-Round-Screen-Blood-Oxygen-Pressure-Heart-Rate-Monitor-Fitness-Tracker-Smart-Watch-p-1226168.html?p=WX0407753399201409DA

  • 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?)

pinouts

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?)
@Sunnygssamson
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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

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