CYD ESP32-2432S032
ESP32 with 3.2" touchscreen display - great for touch-based controls, settings panels, and data visualization.
CYD ESP32-2432S032 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 involvementFreely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
4 pins · 4 things to knowBOOTGPIO0 Bootstrapping pin (enter bootloader when low); internal pull-up. Strapping
Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode.
IO1 Default UART0 TX pin for USB-serial programming and console. UART
Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console.
IO3 Default UART0 RX pin for USB-serial programming (console input). UART
Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads.
IO35 Input-only GPIO (no output driver); ADC1 channel 7. Other
Cannot be used as output; only suitable for input.
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. 4 of the exposed pins carry boot-time or system duties on the ESP32 (BOOT, IO1, IO3 and 1 more).
Getting started
flash your first firmware in ~2 minutesBoard: ESP32 Dev Module Flash Size: 4MB (32Mb) Flash Mode: DIO Partition Scheme: Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) Upload Speed: 921600
// toggle GPIO21 - wire an LED and resistor to it
void setup() {
pinMode(21, OUTPUT);
}
void loop() {
digitalWrite(21, HIGH); delay(500);
digitalWrite(21, LOW); delay(500);
}[env:cyd-esp32-2432s032]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32dev - or type it after board =.esp32:
board: esp32dev
variant: esp32
framework:
type: esp-idf
# blink - GPIO21
output:
- platform: gpio
pin: 21
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32dev (same ids as PlatformIO).esptool.py --chip esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x1000 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32 · 55 × 86.7 mm · vs other ESP32 chips →Dimensions
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 pricesResources
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