uPesy ESP32 Wroom DevKit

Development Board

Code name: uPesy_WROOM

ESP32

uPesy ESP32 Wroom DevKit is a development board based on the ESP32 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About uPesy ESP32 Wroom DevKit

General-purpose ESP32 board with WROOM module - compact and easy to integrate into embedded projects.

Where to Buy uPesy ESP32 Wroom DevKit

Starting from

15.99€ per unit

Amazon.com Ships worldwide

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Amazon.de Ships to EU

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AliExpress Best value

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Prices are subject to change. We earn from qualifying purchases as an Amazon Associate.

Technical Specifications

Complete technical specification details for uPesy ESP32 Wroom DevKit

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 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 40

Analog Input 16

PWM 19

Interrupts 16

Download Full Datasheet

Quick Setup

Copy-paste configs for uPesy ESP32 Wroom DevKit - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Upesy Wroom from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Upesy Wroom

CPU Frequency 240 MHz

Flash Size 4MB

Flash Mode DIO

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Upesy Wroom" for the uPesy ESP32 Wroom DevKit.

platformio.ini


[env:uPesy_wroom]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for uPesy ESP32 Wroom DevKit
board_build.mcu        = esp32
board_build.f_cpu      = 240000000L
board_build.flash_size = 4MB
board_build.flash_mode = dio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# uPesy ESP32 Wroom DevKit - 240 MHz ESP32
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x1000 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x1000

uPesy ESP32 Wroom DevKit Pinout Diagram

Complete pin reference for uPesy ESP32 Wroom DevKit

The ESP32-WROOM DevKit provides a comprehensive and flexible pinout layout, making it an ideal choice for a wide range of IoT applications. The module includes a built-in LED connected to GPIO13, which can be easily controlled for status indicators or debugging. Communication is well-supported with dedicated pins like GPIO3 for UART receive and GPIO1 for UART transmit, ensuring seamless serial communication with other devices or computers.

For I2C communication, the board features GPIO21 for SDA and GPIO22 for SCL, allowing the connection of peripherals like sensors and displays. The SPI interface is equally robust, with GPIO23 for MOSI, GPIO19 for MISO, GPIO18 for SCK, and GPIO5 for the SS (Slave Select) line. These pins enable high-speed communication with external devices such as memory modules or other microcontrollers.

The board also supports multiple analog inputs through its ADC channels, with pins like GPIO36 (A0), GPIO39 (A3), GPIO32 (A4), and GPIO33 (A5). These pins are perfect for interfacing with sensors that provide analog output, such as temperature or light sensors. Additionally, it features two DAC outputs on GPIO25 (DAC1) and GPIO26 (DAC2), which allow for digital-to-analog signal conversion for applications like audio or waveform generation.

Safe Pins to Use

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

LED_BUILTIN

IO21

IO22

IO23

IO19

IO18

IO32

IO33

IO25

IO26

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
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
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
IO5	GPIO5	Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot.	🛠️ Strapping
IO36	GPIO36 (SENSOR_VP)	Cannot be used as output; only suitable for input (e.g., analog read).	🪛 Other
IO39	GPIO39 (SENSOR_VN)	Cannot be used as output; only suitable for input.	🪛 Other

Useful Links

Datasheets and resources for uPesy ESP32 Wroom DevKit

Board Datasheet

Technical specifications

ESP32 Datasheet

Microcontroller reference

uPesy ESP32 Wroom DevKit Custom Pin Mapping

Pin configuration and GPIO mapping for uPesy ESP32 Wroom DevKit

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	Description
1	LED_BUILTIN	GPIO13	output	Built-in LED
2	IO3	GPIO3	input	UART Receive
3	IO1	GPIO1	output	UART Transmit
4	IO21	GPIO21	bidirectional	I2C Data Line
5	IO22	GPIO22	bidirectional	I2C Clock Line
6	IO5	GPIO5	bidirectional	SPI Slave Select
7	IO23	GPIO23	bidirectional	SPI Master Out Slave In
8	IO19	GPIO19	bidirectional	SPI Master In Slave Out
9	IO18	GPIO18	bidirectional	SPI Clock Line
10	IO36	GPIO36	input	ADC1 Channel 0
11	IO39	GPIO39	input	ADC1 Channel 3
12	IO32	GPIO32	input	ADC1 Channel 4
13	IO33	GPIO33	input	ADC1 Channel 5
14	IO25	GPIO25	output	Digital-to-Analog Converter 1
15	IO26	GPIO26	output	Digital-to-Analog Converter 2

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Pin Mappings

Complete pinout and GPIO mapping for uPesy ESP32 Wroom DevKit

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
0	A11	T1
1			PWM	TX
2	A12	T2	PWM	LED_BUILTIN
3			PWM	RX
4	A10	T0	PWM
5			PWM	SS
12	A15	T5	PWM
13	A14	T4	PWM
14	A16	T6	PWM
15	A13	T3	PWM
18			PWM	SCK
19			PWM	MISO
21			PWM	SDA
22			PWM	SCL
23			PWM	MOSI
25	A18		PWM	DAC1
26	A19		PWM	DAC2
27	A17	T7	PWM
32	A4	T9	PWM
33	A5	T8	PWM
34	A6
35	A7
36	A0
39	A3

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for uPesy ESP32 Wroom DevKit

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