LILYGO T-BLOCK Btb interface expansion board is the abbreviation of (Board-to-board Connectors), through the 20pin Btb interface to replace the top function board of the T-BLOCK, you only need a T-BLOCK host to change different displays , Or applications that do not require a display screen. The main control chip is still ESP32.
The T-BLOCK IPS circular LCD version is one of them. It is based on the T-BLOCK base host and replaces a round-shaped display of the Btb expansion board.
Product pin diagram:
![LILYGO T-BLOCK IPS round LCD 1.3 inch GC9A01 driver ESP32 wifi bluetooth for arduino]( "LILYGO T-BLOCK IPS round LCD 1.3 inch GC9A01 driver ESP32 wifi bluetooth for arduino")
Github Link:
https://github.com/Xinyuan-LilyGO/TTGO_TWatch_Library/tree/master/examples/LVGL
Btb interface expansion function board parameters:
-Circular LCD display 1.3 inch 240x240 GC9A01 drive HD IPS
-Btb (Board-to-board Connectors) 20pin connector
T-BLOCK host parameters:
-ESP32 WIFI/Bluetooth
-16 MByte flash
-8MB PSRAM
-Six-axis sensor MPU6050
-RTC PCF8563
-PMU AXP202
-Touch button TTP223
-Custom buttons
-2s second power on/6s power off button
-TYPE-C USB
-I2C interface
-2x8pin 2.54 female expansion port on both sides of the bottom
-Built-in 200ma battery
Shipping List:
1 X T-BLOCK round screen expansion board basic version
1 X charging cable