LSM9DS1

Note

Before using it, please install Get Started.

Introduction

This document is T-Wristband-LSM9DS1 example description. LSM9DS1 sensor for instructing the user how to use the T-Wristband.

Arduino

T-Wristband can choose ESP32 Dev Module, and other settings can be kept as default.

Warning

T-Wristband does not use PSRAM, please do not enable PSRAM, and call PSRAM functions.

Related Function Switch

By modifying T-Wristband-LSM9DS1.ino The related macros in _ enable or disable certain functions.

Hardware Test

The FACTORY_HW_TEST macro is used to test whether the hardware status of the bracelet is normal. It is disabled by default.

// #define FACTORY_HW_TEST

BLE transmits IMU data

The ENABLE_BLE_DATA_TRANSMISSION macro is used to test the BLE transfer IMU data example, which is disabled by default.

You can use nRF Connect, LightBlue and other APPs to connect to view the data.

// #define ENABLE_BLE_DATA_TRANSMISSION

Enable LSM9DS1 sensor function

The ENABLE_SENSOR macro is used to enable the LSM9DS1 sensor function. Off by default.

// #define ENABLE_SENSOR

Enable LSM9DS1 sensor shutdown mode function

The USE_PROTECTED_MEMBERS macro is used to enable the LSM9DS1 sensor shutdown mode function. Off by default.

// #define USE_PROTECTED_MEMBERS

Note

Before use, please make sure that you have changed the three member methods of SparkFun_LSM9DS1_Arduino_Library to common member methods, or directly use the library file in libdeps.

OTA update

The ARDUINO_OTA_UPDATE macro is used to enable the OTA update function, which is disabled by default.

// #define ARDUINO_OTA_UPDATE

User Manual

Touch the button to switch to the next function when a press is detected:

1. Press for the first time to view the nine-axis sensor information

2. Press it a second time to enter deep sleep

3. During deep sleep, touch again to wake up the bracelet

OTA update:

1. Touch and hold the button for three seconds to do a WiFi reset.

2. Select T-Wristband in the Arduino IDE port to upgrade over the air, as shown below:

   

Note

Enable ARDUINO_OTA_UPDATE macro OTA update is valid.

Datasheet

• ESP32-PICO-D4 (Datasheet)

• ST7735 (Datasheet)

• LSM9DS1 (Datasheet)

Pinout

Name	Pin
TFT Driver	ST7735
TFT_MISO	N/A
TFT_MOSI	19
TFT_SCLK	18
TFT_CS	5
TFT_DC	23
TFT_RST	26
TFT_BL	27
Touchpad	33
Touchpad Power	25
RTC Interrupt	34
Battery ADC	35
I2C_SDA	21
I2C_SCL	22
CHARGE Indication	32
IMU INT1	38
IMU INT2	39
IMU INTM	37
IMU RDY	36