Difference: TheT-watch2020Hardware (1 vs. 9)

Revision 92021-01-29 - UliRaich

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The T-Watch 2020 hardware devices

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Some time ago a custom version of MicroPython integrating lvgl and all drivers needed to drive the t-watch devices was published on
https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython

. I got the drivers below , except of the I2S driver, from this source.

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The st7789_lvgl display driver
The ft6x36 touch panel driver

The Real-time clock and calendar: PCF8563 driver
The Power System Management: AXP202 driver
The Triaxial Acceleration Sensor: BMA423 driver

Revision 82021-01-28 - UliRaich

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The T-Watch 2020 hardware devices

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a BMA423 three-axis accelerometer
a MAX98357a I2S audio amplifier
a AXP202 power management unit

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a PCF8563 real time clock

a 240x240 TFT screen controlled by a ST7789V display controller
a touch screen controlled by a FT6236U touch screen controller
it supports IR control, a vibration motor

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The Max9837 I2S Audio Power Amplifier: t-watch sound
The buzzer and vibration motor t-watch buzzer
The IR remote control: t-watch IR

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The ttgo module

Uli Raich - 2021-01-08

Revision 72021-01-27 - UliRaich

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The T-Watch 2020 hardware devices

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I2C bus 1:0x38

FT6236U Touch Screen Controller

Drivers for the T-Watch hardware:

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Some time ago a custom version of MicroPython integrating lvgl and all drivers needed to drive the t-watch devices was published on
https://github.com/OPHoperHPO/lilygo-ttgo-twatch-2020-micropython

. I got the drivers below , except of the I2S driver, from this source.

The Real-time clock and calendar: PCF8563 driver
The Power System Management: AXP202 driver
The Triaxial Acceleration Sensor: BMA423 driver

Revision 62021-01-25 - UliRaich

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The T-Watch 2020 hardware devices

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The Real-time clock and calendar: PCF8563 driver
The Power System Management: AXP202 driver
The Triaxial Acceleration Sensor: BMA423 driver

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The Max9837 I2S Audio Power Amplifier t-watch sound

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The Max9837 I2S Audio Power Amplifier: t-watch sound
The buzzer and vibration motor t-watch buzzer
The IR remote control: t-watch IR

Uli Raich - 2021-01-08

Revision 52021-01-25 - UliRaich

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The T-Watch 2020 hardware devices

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I2C bus 0:0x51	PCF8563 Real-time Clock and Calendar
I2C bus 1:0x38	FT6236U Touch Screen Controller

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The MAX9837a I2S Audio Power Amplifier

The sound system is described in a separate t-watch sound chapter.

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Drivers for the T-Watch hardware:

The Real-time clock and calendar: PCF8563 driver
The Power System Management: AXP202 driver
The Triaxial Acceleration Sensor: BMA423 driver
The Max9837 I2S Audio Power Amplifier t-watch sound

Uli Raich - 2021-01-08

Revision 42021-01-25 - UliRaich

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META TOPICPARENT	name="WebHome"

The T-Watch 2020 hardware devices

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a MAX98357a I2S audio amplifier
a AXP202 power management unit
a 240x240 TFT screen controlled by a ST7789V display controller

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a touch screen controlled by a FT6236U touch screen controlle

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a touch screen controlled by a FT6236U touch screen controller

it supports IR control, a vibration motor

The pinouts can be found at https://t-watch_document-en.readthedocs.io

Here is a photo of the watch. The program shown on the display is not supplied.

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Software examining the T-Watch 2020 hardware

The programs described in this section are available on github: https://github.com/uraich/twatch2020_firmware/tree/main/hardware

I2C devices

There are 2 I2C buses on the t-watch. To find out which devices are connected to these buses we can use i2cScanBus[0 or 1].py.

The I2C buses use the following connections:

	I2C bus 0	I2C bus 1
SCL	GPIO 22	GPIO 32
SDA	GPIO 21	GPIO 23

Here is the result:

and here is a table relating the I2C addresses to the slave devices:

!I2C slave address	!I2C device
I2C bus 0: 0x35	AXP202 Power System Management
I2C bus 0:0x19	BMA432 Triaxial Acceleration Sensor
I2C bus 0:0x51	PCF8563 Real-time Clock and Calendar
I2C bus 1:0x38	FT6236U Touch Screen Controller

The MAX9837a I2S Audio Power Amplifier

The sound system is described in a separate t-watch sound chapter.

Uli Raich - 2021-01-08

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Revision 32021-01-25 - UliRaich

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The T-Watch 2020 hardware devices

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a 240x240 TFT screen controlled by a ST7789V display controller
a touch screen controlled by a FT6236U touch screen controlle
it supports IR control, a vibration motor

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The pinouts can be found at https://github.com/Xinyuan-LilyGO/TTGO_TWatch_Library/blob/master/docs/watch_2020_v1.md

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The pinouts can be found at https://t-watch_document-en.readthedocs.io

Here is a photo of the watch. The program shown on the display is not supplied.

Revision 22021-01-25 - UliRaich

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The T-Watch 2020 hardware devices

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a 240x240 TFT screen controlled by a ST7789V display controller
a touch screen controlled by a FT6236U touch screen controlle
it supports IR control, a vibration motor

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The pinouts can be found at https://t-watch-document-en.readthedocs.io/en/latest/introduction/product/2020.html

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The pinouts can be found at https://github.com/Xinyuan-LilyGO/TTGO_TWatch_Library/blob/master/docs/watch_2020_v1.md

Here is a photo of the watch. The program shown on the display is not supplied.

Revision 12021-01-08 - UliRaich

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The T-Watch 2020 hardware devices

The LilyGo t-watch 2020 is a smart watch, based on the ESP32, which you must program yourself. If you want a fully functional smart watch with analogue and digital time display, step counter ... then do not buy the t-watch 2020!

If however you want to find out how to create your own smart watch with BliueTooth and Internet connectivity using C or MicroPython programming then do buy the t-watch!

The t-watch 2020 features:

a dual core ESP32 CPU with BlueTooth and WiFi interfaces
16 MBytes of psram
a BMA423 three-axis accelerometer
a MAX98357a I2S audio amplifier
a AXP202 power management unit
a 240x240 TFT screen controlled by a ST7789V display controller
a touch screen controlled by a FT6236U touch screen controlle
it supports IR control, a vibration motor

The pinouts can be found at https://t-watch-document-en.readthedocs.io/en/latest/introduction/product/2020.html

Here is a photo of the watch. The program shown on the display is not supplied.

-- Uli Raich - 2021-01-08

Comments

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META FILEATTACHMENT	attachment="twatch2020.png" attr="" comment="" date="1610101663" name="twatch2020.png" path="twatch2020.png" size="58601" user="UliRaich" version="1"

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