{{template>:template:project
 | name=sma-q2-oss
 | status=[[https://hackaday.io/project/85463-color-open-source-smartwatch\|active]]
 | founder=[[user>emeryth]]
 | repo=[[github>emeryth/sma-q2-oss]]
}}

====== Reverse engineering the SMA-Q2/SMA-Time smartwatch ======
by [[people:emeryth:start|emeryth]] (emeryth at hackerspace.pl)

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===== Intro =====
**SMA Q2** also known as **SMA TIME** is a Chinese smartwatch similar in design and features to the Pebble Time. \\
Featuring a color Memory LCD, heart rate sensor and a NRF52832 Bluetooth SoC to drive it all. \\

<del>All the documents and interesting things are uploaded here: https://owncloud.hackerspace.pl/index.php/s/1bqTRwMI8XKXGKL</del>
\\
**
Follow the project here:** https://hackaday.io/project/85463-color-open-source-smartwatch

===== Firmware =====

The original watch firmware runs on S132 SoftDevice ver 2.0.1. \\
The device contains an OTA bootloader that can be used with the generic Nordic upload tool, so new firmwares can be uploaded safely. \\
Just make sure you have a way to reset the device if you screw up.


===== Hardware =====

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==== Important Components ====

^IC ^Description ^ Datasheet ^
|NRF52832-QFAAB0| Main SoC| |
|LP2985 (?)| 3.3V LDO for everything| |
|LP2985 (?)| 3.3V LDO for heart rate sensor module| |
|??? | Battery charger| |
|KX022-1020 |3-Axis acccelerometer| |
|PAH8002|Heart rate sensor| |
|GD25Q16C (?)|16Mbit SPI flash| |
|LPM013M126A (?)|176x176 Japan Display Color memory LCD| |

==== MCU Pinout ====

^Pin ^Description ^
|P0.02 | LCD SCLK |
|P0.03 | LCD SI |
|P0.05 | LCD SCS |
|P0.06 | LCD EXTCOMIN |
|P0.07 | LCD DISP |
| | |
|P0.04 | Battery voltage measurement (x0.25 divider) |
| | |
|P0.08 | BACKLIGHT ON |
| | |
|P0.09 | BUTTON BACK |
|P0.27 | BUTTON UP |
|P0.28 | BUTTON OK |
|P0.29 | BUTTON DOWN |
| | |
|P0.11 | FLASH MISO |
|P0.12 | FLASH CS |
|P0.13 | FLASH MOSI |
|P0.14 | FLASH CLK |
| | |
|P0.25 | UART RX |
|P0.26 | UART TX |
| | |
|P0.30 | VIBRATOR ON |
| | |
|P0.15 | ACCEL INT ? |
|P0.16 | ACCEL POWER |
|P0.17 | ACCEL SDA |
|P0.18 | ACCEL SCL |
| | |
|P0.19 | HRM SDA |
|P0.20 | HRM SCL |
|P0.22 | HRM INT? |
|P0.10 | HRM RESET? |
|P0.31 | HRM POWER ON |

===== Gallery =====

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