TTGO T-Block modular ESP32 devkit supports “Trolley” covers acting as display, buttons, sensor, proto area, etc…

When I first  LilyGO TTGO T-Block ESP32 devkit with an enclosure and a display it reminded me of the M5Stack Core2 devkit, but it’s actually different as LilyGO designed a modular system that allows users to change the functionality of the top cover with expansion boards called “Trolleys”.

That means TTGO T- Block can be fitted with a small e-Ink display, a prototyping cover, an RGB LED matrix, a small board that supports various MQ gas sensors, touch buttons, or a Trolley board equipped with headers compatible with common Arduino modules.

TTGO T-Block modular ESP32 devkit

TTGO T-Block Host 9102 preliminary specifications:

  • WiSoC – ESP32 dual-core processor @ 240 MHz with 520KB SRAM, WiFi 4 and Bluetooth LE 4.2/5.x connectivity
  • Memory – 8MB PSRAM
  • Storage – 16MB SPI flash, MicroSD card slot
  • USB – 1x USB Type-C for power and programming via CH2104 USB to TTL chip
  • Trolley interface – 20-pin connector with 17x GPIO, VCC, 3.3V and GND
  • Misc – 1x Power button, 1x user button (GPIO36)
  • Power Supply – 5V/1A via USB-C port; Note: the specs also mention support for 3.7-4.2V Lithium batteries, but I’m not so sure about that
  • Dimensions – About 40 x 36.5 mm

TTGO T-Block pinout

We are directed to the T-Watch Github repo for software support, but I’m unable to find anything specific to TTGO T-Block, so either the code for the T-Watch can be reused here, or they have yet to upload the Arduino sketches specific to the T-Block kits.

If you are interested in the solution you can either purchase items separately with TTGO T-Block Host 9102 going for $24.86, and Trolleys selling for $1.04 (Trolley_prototyping) to $16.10 (Trolley_e-paper), or buy complete kits with T-Block Host 9102, a USB-C cable, a trolley, and possibly other accessories. The T-Block mini robot with wheels is especially cute 🙂

ESP32 T-Block Robot on wheels


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