Th3maz1ng/W800_Smart_Watch
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# W800_Smart_Watch # W800_Smart_Watch
![](http://82.64.196.164/images/git/W800_watch_header.png)
## Why this project : ## Why this project :
I was interested in working on a bigger project with more challenges and which could be useful. 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 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 :).
@ -24,6 +25,33 @@ The W800 is a pretty interesting chip with impressive characteristics for its pr
* BLE stack : NimBLE * BLE stack : NimBLE
* TCP IP stack : lwip v2.1.3 * 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 - **to implement**
* report it's 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 and docking station :
* The case of the watch is 3D printed and the STL files are available [here]()
## Getting started : ## Getting started :
### So, you'd like to try this project yourself ? ### 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 : ### Here are the steps to follow, in order to build the firmware and flash the board :
@ -87,23 +115,6 @@ make down
make flash make flash
``` ```
## Sensors :
The goal is to embed the following sensors in the watch :
* An accelerometer (for wrist tilt detection, single and double tap detection , foot step counting and more)
Possible choices :
* ADXL345
* MPU6050
* BMI160
* LSM6DS3
* **BMA456** <-- **SELECTED** i2c addr : 0x18 or 0x19 7 bit address, has the wrist tilt detection feature.
* A magnetometer (possible choices):
* **HMC5883L** <-- After reading some comparison articles between the HMC5883L and QMC5883L and the datasheets, the later seems better in term of perfomances.
* **QMC5883L** <-- **SELECTED** i2c addr : 0x0D 7 bit address, better soldering footprint
* LSM303DLHC
* BMM150 <-- Package with balls, hard to solder
* An air pressure/temperature sensor (to display the altitude for example)
* **BMP280** <-- **SELECTED** i2c addr : 0x76 or 0x77
## Actuators : ## Actuators :
* A vibration motor to notify events to the user. * A vibration motor to notify events to the user.
* ~~A piezo buzzer~~ : dropped, maybe in next version. * ~~A piezo buzzer~~ : dropped, maybe in next version.
@ -247,15 +258,13 @@ to save power
* Vibration motor ✓ * Vibration motor ✓
* Charge IC ✓ * Charge IC ✓
### **To sort out :** ### ** 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). * 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 :(. 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** **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. * The new battery should have a size of **26.8x26.8 mm** maximum : 602626 (400 mAh) would be a good choice.
## Next steps : ## Next steps :
* Finish to design and print the casing.
* Add BLE.
* Write and release a usable firmware for every day use. * Write and release a usable firmware for every day use.