CYD ESP32-2432S028

Development Board

Code name: CYD_ESP32_2432S028

CYD ESP32-2432S028 is a development board based on the ESP32 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 32Mbit flash memory.

About CYD ESP32-2432S028

🚀 The CYD ESP32-2432S028 is a budget-friendly ESP32-based development board, commonly referred to as a Cheap Yellow Display (CYD). It features integrated WiFi, Bluetooth 4.2, and a range of I/O interfaces, making it an excellent choice for affordable IoT and embedded display projects. ⚡

📡 With support for 802.11 B/G/N WiFi and Bluetooth 4.2 (BLE), this board is well-suited for wireless applications.

💾 Equipped with 32Mbit SPI Flash, multiple ADC, DAC, I2C, SPI, UART, PWM, and I2S interfaces, it offers a versatile platform for various embedded projects.

Where to Buy CYD ESP32-2432S028

Starting from

$10.49 per unit

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📋 Technical Specifications

Complete technical specification details for CYD ESP32-2432S028

🖥️ Display

Type None

🛰️ Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

🧠 Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 32Mbit

PSRAM None

Architecture xtensa

✨ Features & Pins

Digital IO 21

Analog Input 6

PWM 14

Interrupts 22

Download Full Datasheet

CYD ESP32-2432S028 Board Dimensions

Physical measurements for CYD ESP32-2432S028

CYD ESP32-2432S028 dimensions - height, width

Width 42mm

Length 78mm

CYD ESP32-2432S028 Pinout Diagram

Complete pin reference for CYD ESP32-2432S028

✅ Safe Pins to Use

These pins are safe for general GPIO usage without boot or system conflicts

IO18

IO19

IO21

IO22

💡 Why Are These Pins Safe?

✓ No boot sequence involvement

✓ No flash/PSRAM connections

✓ No USB or JTAG conflicts

✓ Freely assignable without issues

⚠️ Pins to Avoid or Use with Caution

Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.

🔄 Strapping Pins

Boot behavior & flash voltage

🐛 JTAG Debugging

Low-level debugging interface

🔌 USB Pins

USB Serial/JTAG communication

💾 Flash/SPI Pins

Memory & PSRAM connections

📡 UART Serial

Debugging & firmware uploads

PIN	Label	Why Avoid	Type
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
IO2	GPIO2	If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure.	🛠️ Strapping
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
IO16	GPIO16	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	⚡ Flash
IO17	GPIO17	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	⚡ Flash

Useful Links

Datasheets and resources for CYD ESP32-2432S028

Board Datasheet

Technical specifications

ESP32 Datasheet

Microcontroller reference

CYD ESP32-2432S028 Custom Pin Mapping

Pin configuration and GPIO mapping for CYD ESP32-2432S028

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	Description
1	3V3	3.3V	POWER OUTPUT	3.3V power output
2	GND	GND	POWER GROUND	Ground connection
3	5V	5V	POWER INPUT	5V power input
4	IO1	GPIO1	BIDIRECTIONAL	GPIO, ADC, I2C
5	IO2	GPIO2	BIDIRECTIONAL	GPIO, ADC
6	IO3	GPIO3	BIDIRECTIONAL	GPIO, ADC
7	IO16	SPI_CS	BIDIRECTIONAL	GPIO, SPI Chip Select
8	IO17	SPI_D	BIDIRECTIONAL	GPIO, SPI Data
9	IO18	SPI_CLK	BIDIRECTIONAL	GPIO, SPI Clock
10	IO19	SPI_Q	BIDIRECTIONAL	GPIO, SPI Q
11	IO21	UART_TX	OUTPUT	GPIO, UART TX
12	IO22	UART_RX	INPUT	GPIO, UART RX

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Default Tools & Configuration

Build and upload settings for CYD ESP32-2432S028

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x1000`
Flash mode	dio
Boot mode	qio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)