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CYD ESP32-8048S043
ESP32-S3 board with high-res 4.3" screen - best for complex visual interfaces, monitoring dashboards, and smart appliances.
123 × 74 mm
ESP32-S3
MCU
240MHz
clock
16MB
flash
512KB
SRAM
9· 7 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
12 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 5V | power | - | 5V input on the P1 UART programming header |
| 2 | - | 3V33.3V | power | - | 3.3V rail on the P4 header |
| 3 | - | GND | ground | - | Ground, broken out on the P1 and P4 headers |
| 4 | 43 | TXIO43U0TXD | strapping | uart | UART0 TX on the P1 programming header; shared with the CH340 serial console |
| 5 | 44 | RXIO44U0RXD | strapping | uart | UART0 RX on the P1 programming header; shared with the CH340 serial console |
| 6 | 11 | IO11MOSI | strapping | adc · spi | SPI MOSI on the P2 header; shared with the onboard microSD card |
| 7 | 12 | IO12SCLK | strapping | adc · spi | SPI SCLK on the P2 header; shared with the onboard microSD card |
| 8 | 13 | IO13MISO | strapping | adc · spi | SPI MISO on the P2 header; shared with the onboard microSD card |
| 9 | 19 | IO19SDA | uart | adc · i2c | I2C SDA on the P2/P3 headers; shared with the GT911 touch controller |
| 10 | 20 | IO20SCL | uart | adc · i2c | I2C SCL on the P3 header; shared with the GT911 touch controller |
| 11 | 18 | IO18CTP_INT | safe | adc | GT911 touch interrupt net on the P3/P4 headers (needs a solder-jumper mod to reach the GT911) |
| 12 | 17 | IO17GPIO17 | safe | adc | Spare GPIO on the P3 and P4 headers |
Start with these
2 pins with no boot or system involvementIO18CTP_INTIO17GPIO17
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| TX | U0TXD (GPIO43) | Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0). | Other |
| RX | U0RXD (GPIO44) | Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO11 | FSPID | Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use. | Flash |
| IO12 | FSPICLK | Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO. | Flash |
| IO13 | FSPIQ | Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected. | Flash |
| IO19 | USB_D- | By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality. | USB |
| IO20 | USB_D+ | By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality. | USB |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes The CYD ESP32-8048S043 breaks out 12 pins in total: 9 GPIO for your project, with 5V , 3V3 and GND handling power. Peripheral wiring is straightforward: I²C is…
The CYD ESP32-8048S043 breaks out 12 pins in total: 9 GPIO for your project, with 5V, 3V3 and GND handling power.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO19 and SCL on GPIO20, while TX/RX on GPIO43 and GPIO44 cover serial logging and flashing.
Beyond plain digital I/O you get 7 ADC-capable pins for sensors and battery monitoring.
2 of the exposed pins carry boot-time or system duties on the ESP32-S3 (TX and RX) - check the guidance above before wiring anything to them. IO18 and IO17 are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: CH340C. Not detected? Hold BOOT while plugging in.
2
Flash with your tool
Arduino IDE, PlatformIO, ESPHome or esptool - copy the settings on the right.
3
Verify it runs
The blink example uses GPIO18 - swap for your board's LED pin if different.
Board: Cyd Esp32 8048s043
Flash Size: 16MB · DIO
Upload Speed: 921600
// blink
pinMode(18, OUTPUT);
digitalWrite(18, LOW); // on (often inverted)[env:cyd_esp32_8048s043]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-s3-devkitc-1
variant: cyd_esp32_8048s043
framework:
type: esp-idf
# blink - GPIO18
output:
- platform: gpio
pin: 18
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32s3 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 3145728 B · data 327680 B · DIO
Specifications
ESP32-S3 · 123 × 74 mmCompute
MCU
ESP32-S3
Clock
240 MHz
SRAM · Flash
512 KB · 16MB · 8MB (OPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
9 · 7
UART · I²C · SPI
3 · 2 · 4
PWM
8 channels
Power
USB
USB-C
Serial
CH340C
Boot address
0x0
Display
Screen
IPS LCD · 4.3" · 800x480
Driver
ST7262
Touch
GT911
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
3 MB · 320 KB
123 × 74 mm
The CYD ESP32-8048S043 uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with QIO boot mode. The maximum sketch size is 3 MB with 320 KB available for data.
About this board
Inside sits the ESP32-S3 - a dual-core Xtensa with vector extensions suited to AI workloads. Sibling CYD boards cover the ESP32-C3 and ESP32, so you can change radios or horsepower without changing the footprint.
At $40.00 it's on the expensive side for a CYD board - most land around $22.
Around the module: 8MB (OPI) PSRAM, an IPS LCD 4.3" 800x480 display with touch, a microSD slot and Reset/Boot buttons.
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
Board datasheet scribd.com↗ ESP32-S3 datasheet espressif.com↗ Sunton ESP32-8048S043 spec (ESP3D) esp3d.io↗Sunton ESP32-8048S043C on ESPHome Devices devices.esphome.io↗Makerfabs Sunton ESP32-S3 4.3" 800x480 IPS with Touch makerfabs.com↗rzeldent PlatformIO Sunton board definitions (8048S043C pin map) github.com↗HomeDing Panel ESP32-8048S043 GPIO reference homeding.github.io↗
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