LILYGO T-Wristband currently has two versions of the main control chip. They are ESP32 and NRF52832. In order to facilitate people's development and use, other functions are the same. For example, MPU9250, RTC, touch buttons, and 13pin FPC interface all have the same functional parameters. For the comparison of specific main control chips, you can refer to the official chip parameters and make choices. There are two versions of T-Wristband battery capacity to choose from, one is 55ma and the other is 105ma. The 105ma version is recommended.
Instructions on T-Wristband expansion board (NRF52832 main chip version and ESP32 main chip version expansion module are common modules, two different chip versions can be used)
The T-Wristband expansion board is expanded through the 13pin FPC interface socket reserved by the host. The 13pin FPC interface is not only the download connection port, but also the expansion interface of the expansion board. The expansion board is designed with FPC material, and the soft FPC is convenient in limited Expansion in the T-Wristband space. The current expansion board functions include: MAX30102 heart rate expansion module, MAX30208 human body temperature module, and DRV26051 haptic driver vibration motor module. These modules are all separate replacement expansion modules. Due to T-Wristband internal space limitations, they cannot be added to T-Wristband at the same time.
DRV26051 haptic driver vibration motor module parameters:
Introduction: The DRV26051 haptic driver module is designed for various effects, such as swing up and down, vibration, and can simulate more than 100 vibration modes, which will make the human-computer interaction experience better.
In addition, you can use the driver DRV2605L to develop more advanced functions, which have higher execution performance in terms of start-up time and interruption time, and can be accessed through a shared I2C compatible bus or PWM input signal.
-DRV26051 haptic driver chip
-0820 Vibration Motor
-Working voltage @3.3V
-Circuit board material @FPC
-13pin 0.3 spacing with host interface type @I2C
Notice(otherwise it may be damaged):
1. Be careful not to fold the FPC repeatedly.
2. Pay attention to check that the FPC interface and the socket of the host are parallel to avoid skewing.
Pin diagram
Github Link:
The link of T-Wristband
Shipping List:( T-Wristband expansion board X 1 )
Audited Supplier 
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