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CYD ESP32-2432S032
ESP32 with 3.2" touchscreen display - great for touch-based controls, settings panels, and data visualization.
55 × 86.7 mm
ESP32
MCU
240MHz
clock
4MB
flash
520KB
SRAM
6· 2 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
10 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | VIN5V | power | - | P1 serial connector - 5V input (USB rail) |
| 2 | - | 3V33.3V | power | - | CN1 connector - 3.3V output |
| 3 | - | GND | ground | - | Ground - present on the P1, P3 and CN1 connectors |
| 4 | 0 | BOOTIO0GPIO0 | control | adc · touch · pwm | BOOT button - GPIO0 strapping pin (hold low at reset to enter bootloader) |
| 5 | 1 | IO1TXGPIO1 | uart | uart | P1 serial connector - U0TXD, shared with the CH340 USB-serial bridge |
| 6 | 3 | IO3RXGPIO3 | uart | uart | P1 serial connector - U0RXD, shared with the CH340 USB-serial bridge |
| 7 | 21 | IO21GPIO21 | safe | i2c · pwm | P3 connector - free GPIO on this board (backlight uses GPIO27, not GPIO21) |
| 8 | 22 | IO22GPIO22 | safe | i2c · pwm | On both P3 and CN1 (same net); CN1 is the intended I2C connector |
| 9 | 27 | IO27GPIO27 | safe | adc · touch · pwm | CN1 connector - shared with TFT backlight control (conflict if backlight in use) |
| 10 | 35 | IO35GPIO35 | strapping | adc | P3 connector - input-only (ADC1, no output/PWM/DAC/internal pull-ups) |
Start with these
3 pins with no boot or system involvementIO21GPIO21IO22GPIO22IO27GPIO27
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 |
|---|---|---|---|
| BOOT | GPIO0 | Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode. | Strapping |
| IO35 | GPIO35 | Cannot be used as output; only suitable for input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO1 | U0TXD (GPIO1) | Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console. | USB |
| IO3 | U0RXD (GPIO3) | Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads. | 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 ESP32-2432S032 pinout brings out 10 pins - 6 usable GPIO alongside the VIN , 3V3 and GND power rails. For peripherals, TX / RX on GPIO1 and GPIO3 cover…
The CYD ESP32-2432S032 pinout brings out 10 pins - 6 usable GPIO alongside the VIN, 3V3 and GND power rails.
For peripherals, TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
On the analog side there are 2 ADC-capable pins for sensors and battery monitoring, PWM on 3 pins and 1 capacitive-touch inputs.
If you want zero surprises, IO21, IO22 and IO27 are free of any such role - the safest first picks. 2 of the exposed pins carry boot-time or system duties on the ESP32 (BOOT and IO35).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: CH340. 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 GPIO21 - swap for your board's LED pin if different.
Board: Cyd Esp32 2432s032
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(21, OUTPUT);
digitalWrite(21, LOW); // on (often inverted)[env:cyd-esp32-2432s032]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32dev
variant: cyd_esp32_2432s032
framework:
type: esp-idf
# blink - GPIO21
output:
- platform: gpio
pin: 21
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32 · 55 × 86.7 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
6 · 2
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
Micro-USB (UART) · USB-C (UART)
Serial
CH340
Boot address
0x1000
Display
Screen
TFT · 3.2" · 240x320
Driver
ST7789
Touch
XPT2046
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
1.25 MB · 320 KB
55 × 86.7 mm
The CYD ESP32-2432S032 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 1.25 MB with 320 KB available for data.
About this board
Inside sits the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE. Sibling CYD boards cover the ESP32-S3 and ESP32-C3, so you can change radios or horsepower without changing the footprint.
Expect to pay about $20.00 - in line with other CYD boards.
Onboard you'll find a TFT 3.2" 240x320 display with touch, a microSD slot, a speaker connector, an ambient-light sensor, battery charging (IP5306) via JST 1.25 and Reset/Boot buttons.
- Discrete RGB LED (GPIO 4/16/17, active-low)
- Capacitive GT911 touch on the 2432S032C variant
- Some units ship with an ILI9341 display driver instead of ST7789
- Onboard PAM8002A audio amplifier (GPIO26 PWM audio)
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
Board datasheet github.com↗ ESP32 datasheet espressif.com↗ Mischianti - ESP32-2432S032 pinout, datasheet & specs mischianti.org↗Sunton ESP32-2432S032 specification repository github.com↗rzeldent PlatformIO Sunton board definitions github.com↗ESP32 Cheap Yellow Display (CYD) PINS.md - connector convention github.com↗
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