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ESP32-WROOM-32ESTM32F103C8T6 "Blue Pill"

Structured comparison

Conditions and source links stay attached to each value. No automatic winner is declared.

Comparison of ESP32-WROOM-32E, STM32F103C8T6 "Blue Pill"
Attribute	ESP32-WROOM-32EESP32-WROOM-32E	STM32F103C8T6 "Blue Pill"STM32F103C8T6
Overview
Manufacturer	Espressif Systems	Generic / various (STMicroelectronics chip)
Category	Microcontroller	STM32
Object type	module	devboard
Package	Module	Breakout Board
Documented pins	38	41
Interfaces	CAN, I2C, I2S, SPI, UART	CAN, I2C, SPI, UART, USB
Lifecycle	ACTIVE	Unknown
Physical pin mapping	Unknown	Unknown
Browser simulation	Not available	Not available
Electrical
Core	Xtensa dual-core 32-bit LX6Source	ARM Cortex-M3Source
Max Clock	240 MHzSource	72 MHzSource
Flash	Varies by vendor Set by the order-code suffix (e.g. -N4 = 4MB, -N8 = 8MB, -N16 = 16MB) — the bare part number "ESP32-WROOM-32E" doesn't imply a size.	64 KBSource 64KB per the official "C8" density code. Some boards are reported to carry mislabeled higher-density (128KB) dies, but that isn't guaranteed — don't design around it.
SRAM	520 KBSource 520KB total (a portion is reserved by the ROM/software stack at runtime).	20 KBSource
Logic Voltage	3.3 VSource	3.3 VSource
Onboard Regulator	Not applicable	Yes Some LDO is always fitted; the specific part and its quality vary by manufacturer.
Operating Voltage	3 – 3.6 VSource	Varies by vendor Board accepts 5V via USB or the labelled 5V pin, regulated to 3.3V by an onboard LDO — the specific regulator fitted (and how well it holds up under load) varies noticeably between manufacturers.
Interface
GPIO Count	34Source Chip-level GPIO count; 6 of the module's 38 pads are reserved for the internal SPI flash and not usable as GPIO.	37Source Chip-level GPIO count for the LQFP48 package used on this board.
ADC Channels	18Source	10Source External channels on the LQFP48 package (two 12-bit ADCs sharing these inputs).
ADC Resolution	12 bitSource	12 bitSource
Wi-Fi	YesSource	NoSource
Bluetooth	YesSource Bluetooth v4.2 BR/EDR + BLE.	NoSource
Interfaces	i2c, spi, uart, i2s, canSource	i2c, spi, uart, can, usbSource
Physical
USB Connector	noneSource Bare module — no USB peripheral or connector; the ESP32 has no native USB (that's the S2/S3/C3).	micro-usbSource Consistent across clones, unlike most other board-level details.
Package	ModuleSource	Breakout Board
Length	18 mmSource	Varies by vendor Commonly cited around 53×22mm, but as a generic cloned design the PCB outline is not guaranteed consistent across sellers.
Width	25.5 mmSource	Unknown
Height	3.1 mmSource	Unknown
Mounting	smdSource	tht Two 1×20 0.1" pin-header rows.
Header Format	Not applicable	custom Its own 2×20-pin layout — not Arduino/Feather/Pi-HAT compatible.
Thermal
Min Operating Temp	-40 °CSource	-40 °CSource Chip-level industrial rating.
Max Operating Temp	85 °CSource	85 °CSource

Overview

Manufacturer

ESP32-WROOM-32E: Espressif Systems
STM32F103C8T6 "Blue Pill": Generic / various (STMicroelectronics chip)

Object type

ESP32-WROOM-32E: module
STM32F103C8T6 "Blue Pill": devboard

Package

ESP32-WROOM-32E: Module
STM32F103C8T6 "Blue Pill": Breakout Board

Documented pins

ESP32-WROOM-32E: 38
STM32F103C8T6 "Blue Pill": 41

Interfaces

ESP32-WROOM-32E: CAN, I2C, I2S, SPI, UART
STM32F103C8T6 "Blue Pill": CAN, I2C, SPI, UART, USB

Lifecycle

ESP32-WROOM-32E: ACTIVE
STM32F103C8T6 "Blue Pill": Unknown

Physical pin mapping

ESP32-WROOM-32E: Unknown
STM32F103C8T6 "Blue Pill": Unknown

Browser simulation

ESP32-WROOM-32E: Not available
STM32F103C8T6 "Blue Pill": Not available

Electrical

Core

ESP32-WROOM-32E: Xtensa dual-core 32-bit LX6Source
STM32F103C8T6 "Blue Pill": ARM Cortex-M3Source

Max Clock

ESP32-WROOM-32E: 240 MHzSource
STM32F103C8T6 "Blue Pill": 72 MHzSource

Flash

ESP32-WROOM-32E: Varies by vendor
Set by the order-code suffix (e.g. -N4 = 4MB, -N8 = 8MB, -N16 = 16MB) — the bare part number "ESP32-WROOM-32E" doesn't imply a size.
STM32F103C8T6 "Blue Pill": 64 KBSource
64KB per the official "C8" density code. Some boards are reported to carry mislabeled higher-density (128KB) dies, but that isn't guaranteed — don't design around it.

SRAM

ESP32-WROOM-32E: 520 KBSource
520KB total (a portion is reserved by the ROM/software stack at runtime).
STM32F103C8T6 "Blue Pill": 20 KBSource

Logic Voltage

ESP32-WROOM-32E: 3.3 VSource
STM32F103C8T6 "Blue Pill": 3.3 VSource

Onboard Regulator

ESP32-WROOM-32E: Not applicable
STM32F103C8T6 "Blue Pill": Yes
Some LDO is always fitted; the specific part and its quality vary by manufacturer.

Operating Voltage

ESP32-WROOM-32E: 3 – 3.6 VSource
STM32F103C8T6 "Blue Pill": Varies by vendor
Board accepts 5V via USB or the labelled 5V pin, regulated to 3.3V by an onboard LDO — the specific regulator fitted (and how well it holds up under load) varies noticeably between manufacturers.

Interface

GPIO Count

ESP32-WROOM-32E: 34Source
Chip-level GPIO count; 6 of the module's 38 pads are reserved for the internal SPI flash and not usable as GPIO.
STM32F103C8T6 "Blue Pill": 37Source
Chip-level GPIO count for the LQFP48 package used on this board.

ADC Channels

ESP32-WROOM-32E: 18Source
STM32F103C8T6 "Blue Pill": 10Source
External channels on the LQFP48 package (two 12-bit ADCs sharing these inputs).

ADC Resolution

ESP32-WROOM-32E: 12 bitSource
STM32F103C8T6 "Blue Pill": 12 bitSource

Wi-Fi

ESP32-WROOM-32E: YesSource
STM32F103C8T6 "Blue Pill": NoSource

Bluetooth

ESP32-WROOM-32E: YesSource
Bluetooth v4.2 BR/EDR + BLE.
STM32F103C8T6 "Blue Pill": NoSource

Interfaces

ESP32-WROOM-32E: i2c, spi, uart, i2s, canSource
STM32F103C8T6 "Blue Pill": i2c, spi, uart, can, usbSource

Physical

USB Connector

ESP32-WROOM-32E: noneSource
Bare module — no USB peripheral or connector; the ESP32 has no native USB (that's the S2/S3/C3).
STM32F103C8T6 "Blue Pill": micro-usbSource
Consistent across clones, unlike most other board-level details.

Package

ESP32-WROOM-32E: ModuleSource
STM32F103C8T6 "Blue Pill": Breakout Board

Length

ESP32-WROOM-32E: 18 mmSource
STM32F103C8T6 "Blue Pill": Varies by vendor
Commonly cited around 53×22mm, but as a generic cloned design the PCB outline is not guaranteed consistent across sellers.

Width

ESP32-WROOM-32E: 25.5 mmSource
STM32F103C8T6 "Blue Pill": Unknown

Height

ESP32-WROOM-32E: 3.1 mmSource
STM32F103C8T6 "Blue Pill": Unknown

Mounting

ESP32-WROOM-32E: smdSource
STM32F103C8T6 "Blue Pill": tht
Two 1×20 0.1" pin-header rows.

Header Format

ESP32-WROOM-32E: Not applicable
STM32F103C8T6 "Blue Pill": custom
Its own 2×20-pin layout — not Arduino/Feather/Pi-HAT compatible.

Thermal

Min Operating Temp

ESP32-WROOM-32E: -40 °CSource
STM32F103C8T6 "Blue Pill": -40 °CSource
Chip-level industrial rating.

Max Operating Temp

ESP32-WROOM-32E: 85 °CSource
STM32F103C8T6 "Blue Pill": 85 °CSource

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Compare electronics parts

Choose 2–4 parts

Structured comparison

Overview

Manufacturer

Category

Object type

Package

Documented pins

Interfaces

Lifecycle

Physical pin mapping

Browser simulation

Electrical

Core

Max Clock

Flash

SRAM

Logic Voltage

Onboard Regulator

Operating Voltage

Interface

GPIO Count

ADC Channels

ADC Resolution

Wi-Fi

Bluetooth

Interfaces

Physical

USB Connector

Package

Length

Width

Height

Mounting

Header Format

Thermal

Min Operating Temp

Max Operating Temp