4.3" 800x480 ESP32-S31 WiFi6 Touch Display

UES31S043H800V480C-U --- The Next-Gen Flagship ESP32 Smart Display module powered by ESP32-S31 (Dual-Core RISC-V @ 320 MHz). Featuring a 4.3-inch 800x480 IPS Display, Wi-Fi 6 + Bluetooth 5.4 + 802.15.4, USB 2.0 High-Speed OTG, stereo audio, and industrial RS485 / CAN interfaces.

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4.3 inch 800x480 ESP32-S31 WiFi6 Touch Smart Display

1. Introduction

The UES31S043H800V480C-U is a high-performance smart display module designed by VIEWE. It is based on the Espressif ESP32-S31-WROOM-3 module and a 4.3-inch RGB capacitive touch panel (800x480). The LCD and touch devices are the same as those used on the UEDX80480043E-WB-B (ST7262 driver IC and GT911 CTP). The main board is a new design around the ESP32-S31: a dual-core 32-bit RISC-V MCU running at up to 320 MHz, with Wi-Fi 6, Bluetooth 5.4 LE plus Bluetooth Classic, USB 2.0 High-Speed OTG, stereo audio, SDIO 3.0 storage, and RS485 / CAN industrial interfaces.

ESP32-S31 is a preview device

ESP-IDF builds must use the --preview option, for example idf.py --preview set-target esp32s31. Numbered stable releases do not include esp32s31. Module ratings follow the Espressif ESP32-S31-WROOM-3 datasheet (pre-release).

1.1 Product Features

Processor:
- ESP32-S31: RISC-V 32-bit dual-core processor, main frequency up to 320 MHz, plus a ULP-RISC-V coprocessor.
- Wireless: 2.4 GHz Wi-Fi 6 (IEEE 802.11 b/g/n/ax, HT20/40, up to 150 Mbps), Bluetooth 5.4 LE (including LE Audio), Bluetooth Classic (BR/EDR), and IEEE 802.15.4 (Zigbee / Thread).
- Antenna: On-module PCB antenna.
- Security: Secure Boot, Flash / PSRAM encryption, cryptographic acceleration, and TEE.
Memory:
- On-chip: 320 KB ROM, 512 KB SRAM, 32 KB low-power SRAM.
- Module: 16 MB Quad SPI Flash + 16 MB Octal SPI PSRAM (ESP32-S31-WROOM-3-N16R16V), accessible in parallel.
Display:
- Panel: 4.3-inch IPS, 800x480, RGB Vertical Stripe.
- Interface: 40-pin RGB 24-bit.
- Driver IC: ST7262E43-G4. Touch IC: GT911 (Capacitive).
- Brightness: 400 cd/m² (typ.).
- Verified timing: PCLK 18 MHz, negative polarity; HSYNC 1/40/20; VSYNC 1/10/5.
Peripherals:
- USB Type-C: 5 V power, firmware download, and serial debug (CH340C bridged to UART0).
- USB Type-A: Dedicated USB 2.0 High-Speed OTG PHY (USB_DP / USB_DM, not GPIOs). Host 5 V through TPS2051C (~500 mA).
- Storage: On-board MicroSD slot, 4-bit SDMMC / SDIO 3.0.
- Audio: ES8389 stereo codec, dual NS4150B speaker amplifiers, dual analog microphones, L/R speaker connectors.
- Industrial: RS485 (SIT3088E, hardware automatic direction) and CAN (SIT1050T + on-chip TWAI) on a 6-pin terminal.
- Expansion: 2x10 pin 2.54 mm header (H1) with UART0 / UART1, I2C, RS485 / CAN GPIOs, 3.3 V / 5 V / GND.
- Misc: Four ADC keys, RESET / BOOT buttons, WS2812B RGB LED, and a 3 kHz passive buzzer (not attached by default).
Other:
- Operation Temperature: -20 ~ 70 °C (limited by the LCD).
- Storage Temperature: -30 ~ 80 °C.
- MCU module rating: -40 ~ 85 °C.

1.2 Applications

With rich connectivity and powerful processing capabilities, the UES31S043H800V480C-U is an ideal choice for IoT devices in the following areas:

Smart Home Control Panels
Industrial Automation HMI
Smart Appliances
Consumer Electronics
Wireless Data Loggers
Touch Screen Interfaces
Educational Learning Platforms

1.3 Product Naming

Field	Code	Meaning
Form	PLCM	PCB + LCM (Display)
Brand / series	UE	VIEWE smart display module
MCU	S31	ESP32-S31-WROOM-3
Size	S043	4.3 inch
Resolution	H800V480	800x480
Touch	C	Capacitive (GT911)
Bus	U	UART / RS485 / I2C / CAN / USB 2.0 High-Speed OTG

2. Product Information

2.1 Interface Description

This module achieves efficient communication with the main control unit via UART, RS485 and CAN buses, and supports USB 2.0 High-Speed OTG functions to meet diverse data interaction requirements. The capacitive touch screen adopts the GT911 solution to deliver a smooth and responsive touch experience. The 4.3-inch screen features an 800x480 high-definition resolution, ensuring clear and delicate display content. Integrated with the ESP32-S31-WROOM-3, it balances high-performance processing and low-power operation.

No.	Interface	Description
1	Main Control Module	ESP32-S31-WROOM-3. Dual-core RISC-V, up to 320 MHz, 16 MB Flash + 16 MB PSRAM, PCB antenna.
2	Display Interface	40-pin RGB output. The panel is 24-bit capable; this board wires RGB666 (R2-R7 / G2-G7 / B2-B7). See the Display Interface table.
3	SD Card Slot	4-bit SDMMC. CLK = GPIO24, CMD = GPIO25, D0-D3 = GPIO20-23, SD_CTRL = GPIO60 (active low). Examples mount FAT at `SDMMC_FREQ_HIGHSPEED`. Assert GPIO60 low before initializing the host.
4	Touch Interface	I2C (SDA = GPIO0, SCL = GPIO1, 400 kHz) to GT911, shared with ES8389. INT is GPIO38 and RST is present on the 6-pin FPC. The specification says verified examples leave INT and RST unused.
5	USB Type-C	5 V DC input, programming, and serial debug through CH340C (UART0). Hold BOOT (GPIO61), then tap RESET.
6	USB Type-A	USB 2.0 High-Speed OTG PHY (USB_DP / USB_DM). Host 5 V via TPS2051C. VBUS-EN is pulled high by hardware. Type-A defaults to supplying 5 V as a USB Host. When the same port is used as a Device attached to a PC, avoid back-feeding VBUS from both ends.
7	UART Helper (4-pin, 2.5 mm)	GND / RX / TX / VCC for an external serial adapter.
8	RGB LED (WS2812B)	One XL-5050RGBC-WS2812B, DIN = GPIO37, powered from 5 V with a level-shift network.
9	Boot Button	BOOT (GPIO61, SW2) for firmware download mode. Also on H1.
10	Reset Button	RESET (CHIP-EN, SW1).
11	External GPIO Header H1	2x10 pins, 2.54 mm. See the H1 table.
12	Industrial Terminal CN3 (CAN / RS485)	CAN_H, CAN_L, VCC, GND, 485_B, 485_A. Follow the PCB silkscreen.
13	Audio	Speaker L / R (CN2 / CN1), 2-pin 1.25 mm, and on-board microphones MIC1 / MIC2, through ES8389 and NS4150B.
14	ADC Buttons	SW3-SW6 on GPIO42.
15	Buzzer	BEEP_EN = GPIO46, high = on, 3 kHz passive type.
16	DCIN / 5V_SEL	External 5 V input and 5 V source-selection jumper.

2.2 GPIO Definition

Idle pins

The green-marked GPIO pins (GPIO55-57) are idle IOs and are not occupied by any function.

GPIO Number	Current Usage	Function Description
CHIP-EN	Reset	RESET button (SW1)
GPIO0	I2C SDA	GT911 + ES8389. Pulled high at reset (normal boot). Not the BOOT key; also on H1
GPIO1	I2C SCL	GT911 + ES8389; also on H1
GPIO2-7	LCD-R2-R7	LCD red data, high 6 bits
GPIO8-13	LCD-G2-G7	LCD green data, high 6 bits
GPIO14-19	LCD-B2-B7	LCD blue data, high 6 bits
GPIO20-23	SD-D0-D3	SDMMC 4-bit data
GPIO24	SD-CLK	SDMMC clock
GPIO25	SD-CMD	SDMMC command
USB_DP / USB_DM	USB 2.0 HS PHY	Dedicated module pins. Do not configure as GPIO
GPIO33	UART1 TX	Verified as UART1 TX; also a USB Serial / JTAG pad
GPIO34	UART1 RX	Verified as UART1 RX
GPIO35	RS485 TX	SIT3088E DI; S8050 auto-drives DE/~RE; also on H1
GPIO36	RS485 RX	SIT3088E RO; also on H1
GPIO37	WS2812 DIN	On-board XL-5050RGBC-WS2812B
GPIO39	LCD-BL-EN	Backlight enable, active high
GPIO40	LCD-PCLK	Pixel clock, 18 MHz, negative polarity
GPIO42	ADC KEY	SW3-SW6 resistor ladder, ADC1, ~0-2 V usable range
GPIO43	LCD-DE	Data enable
GPIO44	LCD-HS	Horizontal sync (GPIO number, not USB_DM)
GPIO45	LCD-VS	Vertical sync (GPIO number, not USB_DP)
GPIO46	BEEP-EN	Buzzer, active high; 3 kHz PWM recommended
GPIO47	PA-EN	NS4150B amplifier enable, active high
GPIO48	I2S MCLK	Present on schematic; firmware examples leave NC (codec `no_mclk`)
GPIO49	I2S BCK	ES8389 bit clock
GPIO50	I2S WS	ES8389 word select / LRCK
GPIO51	I2S DOUT	MCU → ES8389 DAC
GPIO52	I2S DIN	ES8389 ADC → MCU
GPIO53	CAN TX	SIT1050T TXD
GPIO54	CAN RX	SIT1050T RXD
GPIO55-57	H1 GPIO	Broken out on H1
TX0 (IO58) / RX0 (IO59)	UART0	CH340C download / log; also on H1
GPIO60	SD-CTRL	SD 3.3 V power switch, active low
GPIO61	BOOT	BOOT button (SW2); also on H1

2.3 Display Interface (40-pin)

Pin No.	Symbol	I/O	Description
1	LEDK	P	Power supply for backlight cathode
2	LEDA	P	Power supply for backlight anode
3	GND	P	Power ground
4	VDD	P	Logic supply, 3.3 V
5-12	R0-R7	I	Red data. This board uses R2-R7 (GPIO2-7). R0/R1 = NC
13-20	G0-G7	I	Green data. This board uses G2-G7 (GPIO8-13). G0/G1 = NC
21-28	B0-B7	I	Blue data. This board uses B2-B7 (GPIO14-19). B0/B1 = NC
29	GND	P	Power ground
30	CLK	I	Pixel clock, negative polarity (GPIO40)
31	DISP	I	Standby mode. Normally pulled high
32	HSYNC	I	Horizontal sync, negative polarity (GPIO44)
33	VSYNC	I	Vertical sync, negative polarity (GPIO45)
34	DEN	I	Data enable. Display access is enabled when DE is H (GPIO43)
35	NC	I	Dummy
36	GND	P	Power ground
37-40	XR / YD / XL / YU	-	Dummy

2.4 TP Interface (6-pin)

Pin No.	Symbol	I/O	Description
1	RST	P	Touch reset on FPC; not used
2	3.3V	P	3.3 V logic supply
3	GND	P	Power ground
4	INT	I	Touch interrupt on FPC; TP INT = GPIO38
5	SDA	I	SDA = GPIO0, shared with ES8389
6	SCL	P	SCL = GPIO1, 400 kHz, shared with ES8389

2.5 Display Information

Item	Specification	Unit	Remark
Pixel Driving Element	IPS TFT	-	-
Screen Size	4.3	Inch	Diagonal
Resolution	800 (W) x 3 (RGB) x 480 (H)	Dots	-
Interface	RGB 24 bits	-	40 PIN
Module Power Consumption	1.04	Watt	Typ.
Active Area	95.04 (W) x 53.86 (H)	mm	-
Pixel Pitch (W x H)	0.1188 (W) x 0.1122 (H)	mm	-
Module Size (W x H x D)	105.52 (W) x 67.17 (H) x 2.8 (D)	mm	Tolerance: ±0.2
Luminance	400	cd/m²	Typ.
Viewing Direction	All O'clock	-	-
Display Color	16.2M Colors	24 bits	-

2.6 LCD RGB Timing (Verified)

Parameter	Value
PCLK	18 MHz, `pclk_active_neg=true`
Horizontal resolution	800
Vertical resolution	480
HSYNC pulse / back porch / front porch	1 / 40 / 20
VSYNC pulse / back porch / front porch	1 / 10 / 5
Framebuffer	RGB888 in PSRAM, one framebuffer

2.7 Audio Interface

The audio codec is Everest ES8389 (I2C 7-bit address 0x20). I2S0 is used in full duplex. 48 kHz / 16-bit / stereo playback and record have been verified. MCLK is not required (codec configured with no_mclk). Dual NS4150B Class-D amplifiers drive the left and right speakers. PA_EN = GPIO47. MIC1 and MIC2 are on-board analog microphones.

Signal	GPIO / Device	Description
I2C SDA / SCL	GPIO0 / GPIO1	Shared with GT911, 400 kHz
I2S BCK	GPIO49	Bit clock
I2S WS	GPIO50	Word select / LRCK
I2S DOUT	GPIO51	DAC playback
I2S DIN	GPIO52	ADC record
I2S MCLK	NC in firmware	Optional on schematic
PA_EN	GPIO47	High = amplifier on
Speaker	CN1 / CN2	NS4150B differential output, typ. 4 Ω / 3 W class

2.8 H1 Header (2 x 10, 2.54 mm)

Number	Left	Number	Right
1	3V3	2	5V
3	3V3	4	5V
5	GND	6	GND
7	GPIO0 (SDA)	8	TX1 (GPIO33)
9	GPIO1 (SCL)	10	RX1 (GPIO34)
11	GPIO35 (485_TX)	12	GPIO36 (485_RX)
13	GPIO53 (CAN_TX)	14	GPIO54 (CAN_RX)
15	GPIO55	16	GPIO56
17	GPIO57	18	TX0
19	GPIO61 (BOOT)	20	RX0

Shared pins

GPIO35/36 and GPIO53/54 on H1 are in parallel with the on-board RS485 and CAN transceivers. Do not drive both the header and the terminal at the same time. GPIO0/1 already have I2C pull-ups.

2.9 USB 2.0 Interface

ESP32-S31 integrates a USB 2.0 High-Speed OTG PHY on dedicated USB_DP / USB_DM pins (package pins 44 / 45 of the chip). These are not GPIOs and need no GPIO-matrix setup. The board provides two physical connectors:

Port	Bridge / PHY	Role	Notes
Type-C	CH340C → UART0	Download / log / 5 V in	Hold BOOT (GPIO61), then tap RESET
Type-A	USB 2.0 HS PHY	OTG Host or Device	TPS2051C sources 5 V; VBUS-EN hard-wired high

Verified applications: 1. TinyUSB HID mouse mapped from the touch panel - class-compliant on Windows and Linux, no custom driver. 2. USB extended display - host-side IDD / vendor driver required, JPEG decode to the RGB panel.

Type-A defaults to supplying 5 V as a USB Host. When the same port is used as a Device attached to a PC, avoid back-feeding VBUS from both ends.

2.10 UART / RS485 / CAN

Interface	Controller	MCU Pins	External	Verified Setting
UART0	CH340C	TX0 / RX0	Type-C / H1	Download and monitor
UART1	GPIO matrix	TX = 33, RX = 34	H1 TX1 / RX1	115200 8N1
RS485	SIT3088E + UART	TX = 35, RX = 36	CN3 485_A / 485_B / GND	115200 8N1, auto DE
CAN	SIT1050T + TWAI	TX = 53, RX = 54	CN3 CAN_H / CAN_L / GND	500 kbit/s, Classic CAN

CN3 terminal (follow the PCB silkscreen):

Silk	Function
CAN_H	CAN high
CAN_L	CAN low
VCC	5 V - check jumper and load before using as a supply
GND	Common ground
485_B	RS485 B
485_A	RS485 A

RS485: DE/~RE is switched automatically from 485_TX through an S8050. Treat the port as a normal UART in software; do not configure RTS. 120 Ω termination and A-pull-up / B-pull-down are on board.

CAN: 120 Ω termination on board; CAN_GND is tied to system ground through 0 Ω.

Do not connect a USB-TTL adapter to A/B or CAN_H/L

2.11 Storage, Keys, LED

Micro SD: SDMMC 4-bit - CLK = GPIO24, CMD = GPIO25, D0-D3 = GPIO20-23, SD_CTRL = GPIO60 (active low). Examples mount FAT at SDMMC_FREQ_HIGHSPEED. Assert GPIO60 low before initializing the host.

ADC keys (measured on the real board):

Key	Typical Voltage	Software Window	Remark
Idle	≈3.3 V (pull-up)	Saturated / idle	S31 ADC 0 dB ≈ 0-2 V; idle saturates
SW3	≈0.38 V	100-600 mV	GPIO42
SW4	≈0.82 V	600-1080 mV	GPIO42
SW5	≈1.34 V	1080-1605 mV	GPIO42
SW6	≈1.87 V	1605-2200 mV	GPIO42

Two keys cannot be detected at once (inherent to the divider). Silkscreen order on some drawings does not match the measured voltages; use the table above.

RGB LED: one WS2812B, DIN = GPIO37. Buzzer: 3 kHz passive buzzer, BEEP-EN = GPIO46, not attached by default.

2.12 Voltage & Current

Item	Conditions	Min	Typ	Max	Unit
Power Voltage	DC	-	5.0	-	V
Operation Current	VCC = +5 V, maximum backlight current	80	320	500	mA
Operation Current	VCC = +5 V, backlight off	-	100	-	mA

Recommended power supply: 5 V 1 A DC.

2.13 Reliability Test

Item	Conditions	Min	Typ	Max	Unit
Working Temperature	60% RH at 5 V voltage	-20	25	70	°C
Storage Temperature	---	-30	25	85	°C
Working Humidity	25 °C	10%	60%	90%	RH
ESD	---	Contact: ±4KV / Air: ±8KV			KV

2.14 Mechanical Drawing

Mechanical Notes

Display type: 4.3" 800x480 TFT LCD, transmissive normally black.
Viewing direction: All O'clock. LCM Driver IC: ST7262E43-G4.
TP type: G+G. Lens material: AGC. Lens surface hardness: 3H, window transmittance ≥ 85%.
Backlight LED: 27 pcs white LEDs, If = 40 mA, Vf = 16 V (typ.).
Active Area: 95.04 x 53.86 mm. LCM outline: 105.52 ± 0.2 x 67.2 ± 0.2 mm.
Unspecified tolerance: ±0.2 mm. RoHS 2.0 compliant.

3. Functional Block Diagram

The ESP32-S31 integrates the display (RGB), touch (I2C), audio (I2S), storage (SDIO 3.0), industrial (UART / RS485 / CAN) and USB 2.0 HS OTG subsystems on a single module.

Shared RF front-end

ESP32-S31 includes a 2.4 GHz radio that supports Wi-Fi 6, Bluetooth 5.4 (LE), Bluetooth Classic, and 802.15.4. Because they share the same RF front-end, Wi-Fi and Bluetooth cannot transmit or receive simultaneously; the radio switches between protocols as needed. USB 2.0 High-Speed is an independent PHY and does not share that front-end.

4. Software

We provide a comprehensive collection of code examples based on ESP-IDF. Every project uses the board support package viewesmart/bsp_ues31s043h800v480c_u.

ESP32-S31 requires ESP-IDF master

ESP32-S31 can only use ESP-IDF master. Stable releases such as 5.4 or 5.5 do not include this chip. Install Espressif EIM first, then install the master branch. All idf.py commands for this target need the --preview option.

4.1 Getting Started

4.1.1 Preparation

Hardware: UES31S043H800V480C-U board, USB-C cable.
Software: ESP-IDF master (Required) with the esp32s31 target available.

4.1.2 Build & Flash Steps

Clone the Repository

git clone https://github.com/VIEWESMART/PLCM-UES31S043H800V480C-U.git

Check the Toolchain
```
idf.py --version
idf.py --preview --list-targets
```
idf.py --version must show a path that contains master. The target list must include esp32s31.
Open One Example Folder Each numbered folder is its own project. Do not build from examples/ or examples/esp-idf. Example: examples/esp-idf/01_display_touch.
Build, Flash, and Monitor Connect USB Type-C and select the USB-SERIAL CH340 port (COMx below). From that example folder:
```
idf.py --preview set-target esp32s31
idf.py --preview -p COMx flash monitor
```

Flash success indicators

Flash succeeded when the log shows 100%, Hash of data verified, Hard resetting via RTS pin..., then Project name: plus that folder name. Press Ctrl+] to leave the monitor.

4.2 Software Examples

There are 18 ready-to-run examples located in the examples/esp-idf directory.

#	Example Name	Description	Key Tech / Features
01	display_touch	LCD / Touch	LCD, GT911, backlight.
02	audio_speaker	Speaker	ES8389 speaker playback.
03	audio_mic	Microphone	Microphone recording to SD.
04	sdcard	SD Card	TF / SDMMC 4-bit, mount FAT.
05	adc_buttons	ADC Keys	SW3-SW6 resistor ladder on GPIO42.
06	uart1	UART1	UART1 GPIO33/34 loopback.
07	rs485	RS485	RS485 GPIO35/36, auto direction.
08	can	CAN Bus	CAN GPIO53/54, 500 kbit/s Classic CAN.
09	wifi_sta	Wi-Fi 6	Wi-Fi 6 station.
10	ble_gatt	BLE HID	BLE HID remote (`S31-BSP-HID`).
11	bt_spp	BLE UART	BLE UART echo (`S31-BSP-UART`).
12	usb_hid	USB HID	USB HID mouse from touch.
13	led_buzzer	LED / Buzzer	WS2812 + buzzer.
14	avi_player	AVI Player	SD AVI + JPEG + speaker.
15	mp4_player	MP4 Player	SD MP4 / MJPEG + AAC + speaker.
16	sd_music	Music Player	SD MP3 + LVGL player.
17	bt_audio	BT Audio	Classic A2DP / HFP + LVGL (`S31-BT-AUDIO`).
18	lvgl	Factory UI	LVGL widgets + touch.

Example-specific configuration

Before flashing 09_wifi_sta, edit EXAMPLE_WIFI_SSID and EXAMPLE_WIFI_PASSWORD in main/main.c to your own 2.4 GHz access point.
17_bt_audio needs $env:SDKCONFIG_DEFAULTS = "sdkconfig.defaults;sdkconfig.defaults.esp32s31.classic" set before idf.py, and must not use idf.py bmgr. Clear that variable before building a BLE example.
BLE (10, 11) and Classic Bluetooth (17) must not be combined in one firmware.

Arduino Support

The sample programs related to Arduino IDE are still being adapted. Stay tuned.

📄 Product Documents

Document	Link
Smart Display Specification V1.0	UES31S043H800V480C-U.pdf
Schematic Diagram	SCH_UES31S043H800V480C-U.pdf

🧠 Chip Datasheets

Chip	Document	Language
ESP32-S31-WROOM-3	Datasheet	English
ESP32-S31-WROOM-3	Datasheet	Chinese

🔧 Peripheral Datasheets

Component	Document
ST7262 (LCD Driver)	Datasheet
GT911 (Touch IC)	Datasheet (EN) / Datasheet (CN)
NS4150B (Speaker Amp)	Datasheet
TPS2051C (USB Power Switch)	Datasheet
CH340C (USB to Serial)	Datasheet
WS2812B (RGB LED)	Datasheet

6. FAQ

Why does idf.py say the target esp32s31 is unknown?

ESP32-S31 is a preview device. Numbered stable releases (5.4, 5.5) do not include it. Install ESP-IDF master and pass --preview to every command, for example idf.py --preview set-target esp32s31.

How do I enter download mode?

Hold the BOOT button (GPIO61) and tap RESET, then release BOOT. Connect the USB Type-C port and select the USB-SERIAL CH340 port.

Do I need to configure RTS for RS485?

No. DE/~RE is switched automatically from 485_TX through an S8050. Treat the port as a normal UART in software and do not configure RTS.

Can I use the H1 header pins and the CN3 terminal at the same time?

No. GPIO35/36 and GPIO53/54 on H1 are in parallel with the on-board RS485 and CAN transceivers. Do not drive both the header and the terminal at the same time.

Why is MCLK not used for the audio codec?

GPIO48 (I2S MCLK) is present on the schematic, but the firmware examples leave it NC and configure the ES8389 with no_mclk. 48 kHz / 16-bit / stereo playback and record have been verified.

Can I run Wi-Fi and Bluetooth at the same time?

They share the same 2.4 GHz RF front-end, so Wi-Fi and Bluetooth cannot transmit or receive simultaneously; the radio switches between protocols as needed. Note also that BLE (examples 10, 11) and Classic Bluetooth (example 17) must not be combined in one firmware.

There is no log on the external UART header. Is the port dead?

No. Download and the default log use UART0 through the Type-C CH340C bridge (TX0 / RX0, IO58 / IO59). UART1 is GPIO33 (TX) and GPIO34 (RX) on H1, 115200 8N1. Do not connect a USB-TTL adapter to RS485 A/B or CAN_H/L.

Why do the ADC key voltages printed on the silkscreen not match the readings?

Silkscreen order on some drawings does not match the measured voltages. Use the measured table in Section 2.11: SW3 ≈0.38 V, SW4 ≈0.82 V, SW5 ≈1.34 V, SW6 ≈1.87 V.

ESP32 Smart Display Series --- Explore the full ESP32 display family, from 1.28" knobs to 11" HD panels.
ESP32-P4 Displays: Interfaces & Limits --- Where ESP32 display platforms sit in terms of interface options and resolution ceilings.
RGB LCD Timing Parameters Explained --- How HBP / HFP / VBP / VFP shape a working RGB panel configuration.

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