WEMOS D1 R32

Development Board

Code name: D1_UNO32

ESP32 WEMOS

WEMOS D1 R32 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 WEMOS D1 R32

Arduino Uno-compatible ESP32 board - perfect for developers transitioning from AVR to ESP.

Technical Specifications

Complete technical specification details for WEMOS D1 R32

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 18

Interrupts 16

Quick Setup

Copy-paste configs for WEMOS D1 R32 - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select D1 Uno32 from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) D1 Uno32

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 "D1 Uno32" for the WEMOS D1 R32.

platformio.ini


[env:d1_uno32]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for WEMOS D1 R32
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"

# WEMOS D1 R32 - 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

Useful Links

Datasheets and resources for WEMOS D1 R32

ESP32 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for WEMOS D1 R32

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	PWM	Other
1		PWM	TX
2	A0	PWM	LED_BUILTIN
3		PWM	RX
4	A1	PWM
5		PWM	SS
12		PWM
13		PWM
14		PWM
16		PWM
17		PWM
18		PWM	SCK
19		PWM	MISO
21		PWM	SDA
22		PWM	SCL
23		PWM	MOSI
25		PWM
26		PWM
27		PWM
34	A3
35	A2
36	A4
39	A5

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 WEMOS D1 R32

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)