CYD ESP32-2432S024
Compact ESP32 board with 2.4" touchscreen - ideal for simple GUIs, smart controls, and visual interfaces.
CYD ESP32-2432S024 Pinout
11 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3V33.3V | power | - | 3.3V output on CN1 connector |
| 2 | - | 5VVIN | power | - | 5V input on P1 serial connector |
| 3 | - | GND | ground | - | Ground - present on P1, P3, CN1 and speaker connectors |
| 4 | 0 | IO0BOOTGPIO0 | control | - | BOOT button (GPIO0 strapping pin) - usable as an input |
| 5 | 1 | IO1TXGPIO1 | uart | uart | P1 serial connector - U0TXD, shared with CH340 USB programming/serial |
| 6 | 3 | IO3RXGPIO3 | uart | uart | P1 serial connector - U0RXD, shared with CH340 USB programming/serial |
| 7 | 21 | IO21GPIO21 | safe | pwm | P3 connector - drives the TFT backlight, not freely usable |
| 8 | 22 | IO22GPIO22 | safe | i2c · pwm | P3 and CN1 connectors (same net) - default I2C SCL |
| 9 | 26 | IO26GPIO26 | safe | dac · pwm | Speaker connector - drives the onboard FM8002A audio amplifier (DAC2) |
| 10 | 27 | IO27GPIO27 | safe | adc · touch · i2c · pwm | CN1 connector - ADC2/TOUCH7, usable as I2C SDA |
| 11 | 35 | IO35GPIO35 | strapping | adc | P3 connector - input-only (ADC1), no internal pull-up |
Start with these
4 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 knowIO0 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.
Across 11 pins, the CYD ESP32-2432S024 exposes 7 GPIO plus 3V3, 5V and GND for power.
Peripheral wiring is straightforward: TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
Beyond plain digital I/O you get 2 ADC-capable pins for sensors and battery monitoring, PWM on 4 pins, 1 capacitive-touch inputs and 1 true DAC output.
4 of the exposed pins carry boot-time or system duties on the ESP32 (IO0, IO1, IO3 and 1 more) - check the guidance above before wiring anything to them. IO21, IO22, IO26 and IO27 are free of any such role - the safest first picks.
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-esp32-2432s024]
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 · 68 × 36.5 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.
At $15.00 it's cheaper than most CYD boards, which usually run around $22.
Around the module: an IPS LCD 2.4" 240x320 display with touch, a microSD slot, a speaker connector, an ambient-light sensor and Reset/Boot buttons.
- Capacitive-touch variant (ESP32-2432S024C) swaps the XPT2046 for a CST820 controller
- IPS panel rated ~300 nits, which distinguishes the 2.4" from the TN-panel 2.8" CYD
- Discrete active-low RGB LED (GPIO4 red, GPIO16 green, GPIO17 blue) - not addressable
- Onboard FM8002A audio amplifier with a 2-pin JST speaker connector on GPIO26
- LDR ambient-light sensor on GPIO34
- TFT backlight control on GPIO21
Where to buy
prices are typical street pricesResources
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