3.5' Rotrics

• ESP32 + SDReader + PSRAM + 3.5’ TFT (480x320) with Resistive touch screen
  • Rotrics

Specs

• ESP32
• PSRAM: 8MB
• FLASH: 8MB
• Micro-SD card slot (SDIO 1 bit)
• 3.5-inch 480x320 TFT display - ILI9488 (SPI)
• Capacitive touch panel - XPT2046 (SPI)
• Built-in microphone
• Speaker
• 1 USB-C (Serial 1)
• 1 debug port: GND, 5V, EN, GPIO 0, GPIO 2, GPIO 1 (TX), GPIO 3 (RX)
• Power Supply: 5V / 1A

Note:

The USB-C connector is actually a raw serial 1 port, not a real USB port.

Serial 1 is the serial port used for communication with other devices.

Serial 0 is the serial port used for programming the ESP32, this port is not easily accessible because connector is not soldered.

So do not try to flash TFT using usb-c connector, it won’t work.

Note about USB-C connector:

The ESP32 serial 1 TX is on both TX3 of USB connector, and ESP32 serial 1 RX is on both RX3 of USB connector, GND is GND, 5V is 5V, D+, D-, TX6 and RX6 seems not connected.

Pins

Pin	Usage
GPIO 0	GPIO 0 / CODEC_ES8388_I2S_MCLK
GPIO 1	TX 0
GPIO 2	GPIO 2 / SDIO DAT0
GPIO 3	RX 0
GPIO 4	SDIO DAT1
GPIO 5	CODEC_ES8388_I2S_SCLK
GPIO 6	SPI FLASH
GPIO 7	SPI FLASH
GPIO 8	SPI FLASH
GPIO 9	SPI FLASH
GPIO 10	SPI FLASH
GPIO 11	SPI FLASH
GPIO 12	TFT_BL
GPIO 13	TFT_TOUCH_CS
GPIO 14	SDIO CLK
GPIO 15	SDIO CMD
GPIO 16
GPIO 17
GPIO 18	CODEC_ES8388_I2C_SDA - CE(low) wired to GND
GPIO 19	TFT_CS
GPIO 21	TX 1
GPIO 22	TFT_TOUCH_IRQ
GPIO 23	CODEC_ES8388_I2C_SCL
GPIO 25	CODEC_ES8388_I2S_LRCK
GPIO 26	CODEC_ES8388_I2S_DSDIN
GPIO 27	TFT_DC
GPIO 32	TFT_MOSI
GPIO 33	TFT_SCLK
GPIO 34	TFT_MISO
GPIO 35	CODEC_ES8388_I2S_ASDOUT
GPIO 36	RX 1
GPIO 37	SD_DETECT (Low)
GPIO 38
GPIO 39

CODEC_ES8388

Pin	Usage
ROUT1
LOUT1
ROUT2	speaker
LOUT2
RIN2
LIN2
RIN1
LIN1	microphone