WEMOS LOLIN32 Lite

Development Board

Code name: LOLIN32_LITE

WEMOS LOLIN32 Lite 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 LOLIN32 Lite

The WEMOS LOLIN32 Lite squeezes Espressif’s dual-core ESP32-WROOM-32 module into a slim 57 × 25 mm board that still accepts the classic LOLIN/D1-mini shield ecosystem. It ships with 4 MB of flash, runs up to 240 MHz, and offers both Wi-Fi 802.11 b/g/n and Bluetooth 4.2 (BR/EDR + BLE) for rock-solid wireless connectivity. 📡

A low-cost CH340C USB-to-UART bridge handles programming and serial debugging via the Micro-USB port and supports auto-reset/boot so you can flash sketches without pushing buttons. :contentReference

Onboard power management is Li-Po ready: a TP4054 charger (≈ 500 mA) and a PH-2 battery connector (BAT) let you run projects untethered while the board trickle-charges whenever USB is present. ⚡️

Convenience extras include a RESET push-button, a BOOT (IO0) button for manual download-mode entry, and a bright blue on-board LED on GPIO 5 for quick status indication.

With 22 GPIOs (all PWM-capable), 12-bit ADCs, dual 8-bit DACs, 10 capacitive-touch pads, plus I²C, SPI, UART, SD-card, and RTC IO support, the LOLIN32 Lite punches far above its weight for battery-powered IoT nodes, wearables, or compact sensor gateways. ⚙️

Where to Buy WEMOS LOLIN32 Lite

Starting from

$5 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 WEMOS LOLIN32 Lite

USB

Type Micro-USB

Serial Chip CH340

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

Download Full Datasheet

Quick Setup

Copy-paste configs for WEMOS LOLIN32 Lite - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Lolin32 Lite from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Lolin32 Lite

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 "Lolin32 Lite" for the WEMOS LOLIN32 Lite.

platformio.ini


[env:lolin32-lite]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for WEMOS LOLIN32 Lite
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 LOLIN32 Lite - 240 MHz ESP32
# Flash: 4MB | USB: Micro-USB

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

WEMOS LOLIN32 Lite Board Dimensions

Physical measurements for WEMOS LOLIN32 Lite

WEMOS LOLIN32 Lite dimensions - height, width

Width 25.4mm

Length 58mm

Pin Gap 2.54mm

WEMOS LOLIN32 Lite Pinout Diagram

Complete pin reference for WEMOS LOLIN32 Lite

The LOLIN32 Lite pinout fans out 26 ESP32 GPIOs on two rows, mirroring the original D1-mini shield headers for easy stacking.

Power rails: use USB 5V (or VIN) as input, the regulated 3V3 pin for logic-level peripherals, and the dedicated BAT pin for a single-cell Li-Po. Multiple GND pads provide solid returns.

Serial: U0_TX (GPIO1) and U0_RX (GPIO3) connect to the CH340C for programming/logging. Need more ports? U2_TX (GPIO17) and U2_RX (GPIO16) are free for GPS or RS-485 transceivers.

I²C defaults to SDA (GPIO21) and SCL (GPIO22), broken out on the shield D2/D1 lines-but any spare GPIO can be reassigned.

SPI: the primary VSPI bus (best for OLEDs, SD adapters, radios) maps to MOSI (GPIO23), MISO (GPIO19), SCK (GPIO18), and CS (GPIO5). A secondary HSPI bus lives on GPIO12-15 when you need a second device.

Analog & touch: Eight ADC1 channels (GPIO32-GPIO39) work even with Wi-Fi on. Extra ADC2 pads (GPIO0, 2, 4, 12-15, 25-27) share RF hardware. Dual 8-bit DAC outputs are on GPIO25 and GPIO26. Ten pads double as capacitive-touch inputs-great for touch keys or wake-up gestures.

Every GPIO can generate high-resolution PWM (up to ≈40 kHz). Remember the boot-strap pins-GPIO0, GPIO2, and GPIO15-must sit HIGH (with proper pull-ups) on reset for a normal boot.

With battery charging, robust power rails, and a shield-friendly layout, the LOLIN32 Lite pinout makes it effortless to go from breadboard prototype to compact, battery-powered product.

Safe Pins to Use

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

IO18

IO19

IO22

IO23

IO25

IO26

IO27

IO32

IO33

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
IO0	GPIO0	Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode.	🛠️ Strapping
IO2	GPIO2	If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure.	🛠️ Strapping
IO4	GPIO4	Sampled at reset for boot config; should not be driven at boot (affects boot mode timing).	🛠️ Strapping
IO5	GPIO5	Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot.	🛠️ Strapping
IO12	MTDI (GPIO12)	Keep LOW during boot (internal PD); pulling HIGH at reset selects 1.8V flash mode, causing flash brownout if 3.3V flash is used.	🛠️ Strapping
IO13	MTCK (GPIO13)	Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed.	🪛 Other
IO14	MTMS (GPIO14)	Used for JTAG debugging (TMS); driving it as GPIO may interfere with JTAG or produce spurious signals at boot.	🪛 Other
IO15	MTDO (GPIO15)	Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change.	🛠️ Strapping
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
IO34	GPIO34	Cannot be used as output (no drive capability); only suitable for analog/digital input.	🪛 Other
IO35	GPIO35	Cannot be used as output; only suitable for input.	🪛 Other
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 WEMOS LOLIN32 Lite

Board Datasheet

Technical specifications

ESP32 Datasheet

Microcontroller reference

WEMOS LOLIN32 Lite Custom Pin Mapping

Pin configuration and GPIO mapping for WEMOS LOLIN32 Lite

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	Description
1	5V	5V	POWER INPUT	5V power input for the board
2	GND	GND	POWER GROUNT	Ground connection
3	3V3	3.3V	POWER OUTPUT	3.3V power output
5	IO0	GPIO0	BIDIRECTIONAL	GPIO, ADC
6	IO2	GPIO2	BIDIRECTIONAL	GPIO, ADC
7	IO4	GPIO4	BIDIRECTIONAL	GPIO, ADC
8	IO5	GPIO5	BIDIRECTIONAL	GPIO
9	IO12	GPIO12	BIDIRECTIONAL	GPIO, ADC
10	IO13	GPIO13	BIDIRECTIONAL	GPIO, ADC
11	IO14	GPIO14	BIDIRECTIONAL	GPIO, ADC
12	IO15	GPIO15	BIDIRECTIONAL	GPIO
13	IO16	GPIO16	BIDIRECTIONAL	GPIO
14	IO17	GPIO17	BIDIRECTIONAL	GPIO
15	IO18	GPIO18	BIDIRECTIONAL	GPIO
16	IO19	GPIO19	BIDIRECTIONAL	GPIO
17	IO22	GPIO22	BIDIRECTIONAL	GPIO
18	IO23	GPIO23	BIDIRECTIONAL	GPIO
19	IO25	GPIO25	BIDIRECTIONAL	GPIO, ADC
20	IO26	GPIO26	BIDIRECTIONAL	GPIO, ADC
21	IO27	GPIO27	BIDIRECTIONAL	GPIO, ADC
22	IO32	GPIO32	BIDIRECTIONAL	GPIO, ADC
23	IO33	GPIO33	BIDIRECTIONAL	GPIO, ADC
24	IO34	GPIO34	BIDIRECTIONAL	GPIO, ADC
25	IO35	GPIO35	BIDIRECTIONAL	GPIO, ADC
26	IO36	GPIO36	BIDIRECTIONAL	GPIO, ADC
27	IO39	GPIO39	BIDIRECTIONAL	GPIO, ADC

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Pin Mappings

Complete pinout and GPIO mapping for WEMOS LOLIN32 Lite

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
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	SDA MISO
22			PWM	LED_BUILTIN
23			PWM	SCL 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 WEMOS LOLIN32 Lite

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)