Wiring

Connect the ST7789 TFT display to the ESP32-C3 Super Mini in 8 wires.

The display connects to the ESP32-C3 via SPI using 8 jumper wires. Use hardware SPI pins (GPIO 8 and 10) for best performance.

Connect VCC to 3.3V only — never 5V. Do not use GPIO 6 or 7 for SPI — use GPIO 8 (SCK) and GPIO 10 (MOSI) for hardware SPI.

Wiring table

Display pin	ESP32-C3 GPIO	Wire color (suggested)
VCC	3V3	Red
GND	GND	Black
SDA	GPIO 10 (MOSI)	Orange
SCL	GPIO 8 (SCK)	Green
RES	GPIO 2	Purple
DC	GPIO 1	Blue
CS	GPIO 4	White
BL	GPIO 3	Yellow

Pin definitions

These constants are defined at the top of clawd_mochi.ino:

#define TFT_CS  4
#define TFT_DC  1
#define TFT_RST 2
#define TFT_BLK 3

Use color-coded jumper wires that match the suggestions in the table above. It makes it much easier to trace connections and spot mistakes during assembly.

BL (GPIO 3) controls the backlight. You can toggle it on and off using the “Display on/off” button in the web controller at http://192.168.4.1.