Core: ESP32 1.0

Datasheet for Core: ESP32 1.0, the Attaky host module. For the user guide, see the Core: ESP32 manual. System-wide pin maps and the global I²C address table are on Frame & Connections.

Features

• ESP32-S3 MCU module with Wi-Fi and Bluetooth 5 LE
• 2.0-inch 240×320 color TFT with capacitive touch
• Five front keys (four direction keys + enter) down the right side, and four top buttons (L1, boot, power, R1)
• 6-axis IMU and an ambient-light sensor
• RGB status LED
• USB-C — the everyday charging port for the battery, plus flashing and serial via an onboard USB-to-UART bridge

Components

Specifications

Display & touch

• Display: ST7789, 2.0-inch 240×320 RGB over SPI. The panel is mounted rotated 180° relative to the controller's default orientation; firmware applies a landscape-with-flip rotation so the image reads upright.
• Touch: FT6636 capacitive controller, I²C 0x38. Reset is driven by expander 0x59 pin P13 (active-low); the touch interrupt is routed through expander 0x58 pin P04.

I²C address map (on-board)

Controls

Five front keys — four direction keys and an enter key — in a vertical column on the right side, and four buttons across the top edge: L1, boot, power, and R1 (left to right). All buttons are active-low. Every button is read through the 0x59 GPIO expander except boot, which is wired directly to the MCU.

• POWER is a hardware power switch. A long press (typically ≥ 2 s) toggles the device on or off through the power path; firmware cannot intercept or redefine it. A short press is readable by firmware as a normal key event on 0x59 P07.

Sensors

• IMU — QMI8658A (I²C 0x6B), 6-axis accelerometer + gyroscope. The reference orientation (POSITION_A) is the device standing on a long edge, board vertical, with the sensor's +Y axis up. Axis mapping and gravity direction are consistent unit-to-unit, so orientation classification needs no calibration; absolute magnitude carries the sensor's factory tolerance (±6 % on the accelerometer), so sub-1° tilt accuracy requires a per-unit six-position calibration.
• Ambient light — STK3311-X (I²C 0x48), 16-bit, used for display auto-brightness.

Status LED

RGB status LED, common-anode and active-low, driven by expander 0x59 pins P10 (red), P11 (green), and P12 (blue).

USB

USB-C through the CH340X USB-to-UART bridge — used for firmware flashing and the serial console. It is also the everyday charging port: power over USB-C charges the battery in the attached Power module, and the device can keep running while it charges.

Connectors & power

Core attaches to the Frame through:

Supply rails carried across the connectors: +3V3, VBAT 4.2 V, 5 V system, and USB 5 V.

For the complete connector pin map (every BTB / FPC / PIN position) and the system-wide I²C table, see Frame & Connections.

Mechanical

Operating conditions

Keep it dry, out of direct sunlight, and away from prolonged heat — do not leave it in a parked car.