# W800_Smart_Watch
## Why this project :
I was interested in working on a bigger project with more challenges and which could be useful.
I am also quite unhappy with the smartwatches that are on the market (expensive, no access to the firmware, data collection and privacy issues), that's why I decided to try doing my own that I can fully customize. This is going to be a long adventure with a lot of discoveries along the way :).
I also wanted to test this W800 SOC more deeply and see what it could do and I think it is a perfect fit for the project.
So let's go !
## A Smart Watch project using the Chinese W800 SOC.
The W800 is a pretty interesting chip with impressive characteristics for its price (around 1$) :
### Core :
* 32bit XT804 CPU
* 240 Mhz max clock
### Memory :
* 2 MB on chip flash
* 288 KB RAM, ~130 KB available to the user
### Wireless connectivity :
* Bluetooth EDR(Classic) and BLE 4.2
* WiFi 2.4Ghz 802.11 b/g/n
### SDK & OS
* FreeRTOS v10.4.1
* BLE stack : NimBLE
* TCP IP stack : lwip v2.1.3
## W800 Smart Watch V1 specifications :
#### Sensors :
* A magnetometer (QMC5883L) used by the compass app for example
* An accelerometer (BMA456) to get wrist tilt detection (to wake the screen up), step counts, activity detection (standing, walking and running) and more.
* A pressure and temperature sensor (BMP280) used by the altimeter app for example.
* A heart rate sensor (MAX30102) is planned to be added (connection pads on the PCB, no driver written).
#### Screen and Actuators :
* A 1.28 inch touch screen is being used on the watch (GC9A01 screen controller).
* A vibration motor to notify the user of events.
* No physical buttons as everything can be done using the graphical interface.
#### Connectivity :
* The watch has BLE (4.2) connectivity which is used to connect to a phone using the GadgetBridge app to :
* control music playback - **to implement**
* find my phone feature
* report its battery level
* report step counts - **to implement**
* display received text messages, emails and calls - **to implement**
* WiFi is also available but not used yet because I didn't find any good use case for it. It is also very power hungry.
#### Battery and Battery life:
* The battery currently used in this version of the watch is a 6mm x 25mm x 35mm (602535) single cell 500 mAh lipo battery (had one laying around).
* Using the current battery, expected battery life is :
* ~ 5 days in sleep mode.
* ~ 9 hours when continuously connected to BLE with the phone (I may be able to slightly improve power consumption in BLE mode - working on it).
#### Casing size, Weight and Docking station :
* The case of the watch is 3D printed and the STL design files are available [here](design/FreeCad/stl)
* The size of the watch's case is as follow :
* The thickness of the watch will be reworked in the next version of the casing, the goal is to shave 3 to 4 mm off to reach 12 to 13 mm.
* The watch weighs around 50 grams with the 600 mAh battery and the straps attached to it.
* It also has a docking station designed for it which is used to :
* Recharge the W800 Smart Watch by simply putting the watch on it. The connection between the docking and the watch is done through a magnetic 4 pin connector.
* Flash a new firmware to the watch. No extra programming hardware is required, only the docking is needed.
## Getting started :
### So, you'd like to try this project yourself ?
### Here are the steps to follow, in order to build the firmware and flash the board :
#### On Windows :
1) Start by cloning this repository.
**Put it in a path that doesn't contain any spaces** ie : "C:\Users\Bob\Desktop\projects" for example.
2) Once cloning is done, you will need to install the [MSYS2](https://www.msys2.org/) tool/environment. This tool is needed to compile the project using **Make**.
3) Open a terminal by clicking on the **MSYS2** icon and execute the following commands to prepare the environment :
1) Update packages :
```bash
pacman -Syu
```
2) Install make :
```bash
pacman -S msys/make
```
3) Install automake :
```bash
pacman -S msys/automake
```
4) Install autoconf :
```bash
pacman -S msys/autoconf
```
5) Install gcc :
```bash
pacman -S msys/gcc
```
6) Install git :
```bash
pacman -S msys/git
```
7) Install utils needed for menuconfig :
```bash
pacman -S msys/ncurses-devel
pacman -S msys/gettext-devel
```
4) You now, need to download the toolchain required to compile and link the app [here](http://82.157.145.101/download/toolkits/winnermicro/w806/csky-elfabiv2-tools-mingw-minilibc-20210423.tar.gz) and extract it somewhere you remember on your hardrive.
5) Now, go back to the MSYS terminal window and move to the **src/W800_SDK_v1.00.10/** directory which is located in the cloned repository, using the **cd** command.
6) Then, execute the **make menuconfig** command, this should greet you with a crude configuration window.
Move to the **Toolchain Configuration -->** option using the arrows and hit enter.
Using the same controls, move to the **toolchain path** and **set the location** to where you extracted the toolchain in step 4.
7) To be able to flash the board, you will also need to set the used com port in the **Download Configuration --->** option.
**TIPS : set the download rate to : 2000000**, this should speed up the flashing process.
8) Now save your configuration and exit.
9) Finally, type :
```bash
#This will remove all builded object to start from a clean environment (Needed only once)
make distclean
#This will only compile the library part of the firmware
make lib
#This will compile the actual firmware using the libraries and produce the .bin file
make
#This will flash the board using the previously generated .bin file
make down
#This will do both previous commands in one (build and flash)
make flash
```
## Sensors and I2C addresses :
* Accelerometer : **BMA456** I2C addr : 0x18 or 0x19 7 bit address.
* Magnetometer : **QMC5883L** I2C addr : 0x0D 7 bit address.
* Pressure/Temperature sensor : **BMP280** I2C addr : 0x76 or 0x77 7 bit address.
## Power source :
* A single ~ 400 mAh cell lipo battery.
* A charge/discharge controller stage :
* TP4056
* DW01A + 8205A
## Screen + touch element :
* [Screen with touch](https://fr.aliexpress.com/item/1005004887834918.html?spm=a2g0o.order_list.order_list_main.22.340a5e5bX8WCb0&gatewayAdapt=glo2fra) : GC9A01 with touch panel. It uses the required 4 line Serial Interface.
* Touch element i2c addr : 0x15, CST816D I2C touch driver.
## Programming and charging :
* The smart watch programming and charging is done through the same USB port
using a magnetic 4 pin plug.
## MCU Pin assignement table :
| Pin Number | Pin Name | Type | Function | Pull UP/DOWN| Connected to | Comment |
|------------|----------|------|----------|-------------|--------------|---------|
||PB_20|I/O|**UART0_RX**/PWM1/UART1_CTS/I²C_SCL|U/D|**USB/Serial TX flash pin**||
||PB_19|I/O|**UART0_TX**/PWM0/UART1_RTS/**I²C_SDA**|U/D|**USB/Serial RX flash pin** and **BMA456, Touch Panel, HMC5883L and BMP280 SDA pins**||
||WAKEUP|I|**External Wake Up Pin**|D|**BMA456 IRQ 1 line** and **Touch Panel IRQ line** through NAND Gate|The chip is waken up when the pin is HIGH|
||RESET|I|Reset Pin|D|**Micro switch** and **USB/Serial RTS pin**||
||XTAL_OUT|O|External crystal output||||
||XTAL_IN|I|External crystal input||||
||AVDD3V3|P|Chip power supply, 3.3V||||
||ANT|I/O|RF Antenna||||
||AVDD3V3|P|Chip power supply, 3.3V||||
||AVDD3V3|P|Chip power supply, 3.3V|||
||AVDD3V3_AUX|P|Chip power supply, 3.3V||||
||TEST|I|Test function configuration pin||||
||BOOTMODE|**I/O**|BOOTMODE and I²S_MCLK/LSPI_CS/PWM2/I²S_DO|U/D|**Touch Panel Reset line**||
||PA_1|I/O|JTAG_CK/**I²C_SCL**/PWM3/I²S_LRCK/ADC0|U/D|**BMA456, Touch Panel, HMC5883L and BMP280 SCL pins**||
||PA_4|I/O|JTAG_SWO/I²C_SDA/PWM4/I²S_BCK/**ADC1**|U/D|**Battery resistor voltage divider output**||
||PA_7|I/O|**PWM4**/LSPI_MOSI/I²S_MCK/I²S_DI/Touch0|U/D|**LCD backlight N-MOSFET driver**||
||VDD3V3IO|P|IO power supply, 3.3V||||
||PB_0|I/O|**PWM0**/LSPI_MISO/UART3_TX/PSRAM_CK/Touch3|U/D|**Vibration motor control pin**||
||PB_1|**I/O**|PWM1/LSPI_CK/UART3_RX/PSRAM_CS/Touch4|U/D|**Touch Panel IRQ line**||
||PB_2|I/O|PWM2/LSPI_CK/**UART2_TX**/PSRAM_D0/Touch5|U/D|**Debug UART serial output**||
||PB_3|**I/O**|PWM3/LSPI_MISO/UART2_RX/PSRAM_D1/Touch6|U/D|**TP4056A Charging Signal**||
||PB_4|**I/O**|LSPI_CS/UART2_RTS/UART4_TX/PSRAM_D2/Touch7|U/D|**TP4056A Charged Signal**||
||PB_5|**I/O**|LSPI_MOSI/UART2_CTS/UART4_RX/PSRAM_D3/Touch8|U/D|**Battery resistor voltage divider enable**||
||VDD3V3IO|P|IO power supply, 3.3V||||
||CAP|I|External capacitor, 4.7µF||||
||PB_6|I/O|UART1_TX/**MMC_CLK**/HSPI_CK/SDIO_CK/Touch9|U/D|**LCD Serial Clock Pin**||
||PB_7|I/O|UART1_RX/**MMC_CMD**/HSPI_INT/SDIO_CMD/Touch10|U/D|**LCD Serial Data Pin**||
||PB_8|**I/O**|I²S_BCK/MMC_D0/PWM_BREAK/SDIO_D0/Touch11|U/D|**LCD Data or Command Selection Pin**||
||PB_9|**I/O**|I²S_LRCK/MMC_D1/HSPI_CS/SDIO_D1/Touch12|U/D|**LCD Reset Pin**||
||PB_10|**I/O**|I²S_DI/MMC_D2/HSPI_DI/SDIO_D2|U/D|**LCD Chip Select Pin**||
||VDD3V3IO|P|IO power supply, 3.3V||||
||PB_11|**I/O**|I²S_DO/MMC_D3/HSPI_DO/SDIO_D3|U/D|**BMA456 IRQ 2 line**||
||GND|P|Ground (Central Pad)||||
## What is done/working so far - HARDWARE :
* Schematic :
* First version of the schematic is done an available [here](design/Kicad/W800_Smart_Watch/W800_Smart_Watch.pdf).
* 2 layer PCB version 1.0 design is done based on the schematic. It has a 38 mm diameter size.
* Wake up interrupts handling :
* Wrist tilt MCU wake up working
* LCD touch wake up
* MCU sleep feature :
* Sleep and Standby modes working but implemented in a crude way.
Can and should be improved.
* PIFA antenna tested, performance isn't the best but it is working well for what it will be used for (BLE).
## What is done/working so far - SOFTWARE :
* LVGL 8.3.3 running on the SOC using DMA.
* Supported LCD drivers :
* ILI9341 in 4-line serial mode (8 bits) with D/C pin
* ST7789 in 4-line serial mode (8 bits) with D/C pin
* GC9A01 in 4-line serial mode (8 bits) with D/C pin <-- **this one is used**.
* Supported LCD touch screen :
* CST816D I2C capacitive touch ic.
* Four screens designed and working with LVGL :
* 1 watch face based on a casio watch.
* 1 menu screen with a list of icons.
* 1 setting screen with basic settings (date and time + display brightness) (work in progress).
* 1 compass application using the QMC5883L.
* Debug UART on PB_2 (**output only**)
* Sensors/Actuators :
* QMC5883L driver working
* BMA456 driver working
* BMP280 driver working (temperature + pressure + altitude)
* Battery voltage sense using ADC is working
* Vibration motor controlled by PWM working
* Update the W800 SDK from version 1.00.08 to version 1.00.10 released in January of 2023.
* Added **multi-language** support to the UI, still some translations to do though.
* Step counter using the BMA456 is working and steps are displayed on the watch face.
## To do - HARDWARE:
* [ ] Add the MAX30102 Heart Rate Monitor to the current design.
* [X] Issue with the DW01A chip, ~~should be as easy as to replace the 100nf C12 cap with a lower value, let's say 80nf~~, found a workaround.
## To do - SOFTWARE
* [X] Finish to design the settings page.
* [X] Implement watch settings persistency using the integrated flash memory
* [ ] Implement a good algorithm to handle adaptiv MCU clock
to save power
* Drivers:
* [ ] Write/port the MAX30102 Heart Rate Monitor driver to the project.
* [ ] Add a wake up alarm app (using the vibration motor).
* [X] Add BLE functionality.
## Achieved power consumption recap:
(Need to work on sleep current :-( )
| Mode | Current draw | Estimated battery life (450 mAh lipo) |
|--------------------------|--------------|---------------------------------------|
|Active (40Mhz clk)
(No BLE / No WiFi) |~52 mA | ~8 hour |
|Active (240Mhz clk)
(No BLE / No WiFi) |~72 mA | ~6 hour |
|Sleep |~4.5 mA |~4 days and 4 hours |
|Standby |~1.8 mA |~10 days and 15 hours |
## Some screenshots of the achieved visuals currently running on the watch using lvgl :
## Here is a preview of what the PCB should look like :
### The front :
### The back :
## Update 21/03/2023 : PCBs were received from JLCPCB and this what they look like :
## And the watch running :
### **Almost everything works :**
* BMA456 ✓
* BMP280 ✓
* QMC5883L ✓
* Screen + touch panel ✓
* CH340E for chip programming ✓
* Vibration motor ✓
* Charge IC ✓
### ** Known issues :**
* DW01A chip not driving the double N mosfet as expected (when plugging a battery, the watch doesn't start without beeing plugged into the charger at least once).
Thought it might be a capacitor value issue, replaced C12 with a 82nf and 68nf caps, but it did not solve the problem :(.
**TLDR : after installing the battery, the watch might need to be plugged to it's charger at least once to start up**
* The new battery should have a size of **26.8x26.8 mm** maximum : 602626 (400 mAh) would be a good choice.
## Next steps :
* Write and release a usable firmware for every day use.
## If you are interested by the project or if you just want to say hi, you can contact me at the email address : bugreport[at]laposte.net .