Components

ESP32-S3 vs STM32: Which Microcontroller Should You Use?

A practical comparison of ESP32-S3 and STM32F411 boards for IoT, robotics and maker projects — connectivity, power, tooling and price.

2026 · 9 min read

Key takeaways

Pick ESP32-S3 when you need Wi-Fi or Bluetooth built in.
Pick STM32 for real-time control, motors and low-jitter timing.
Both work with Arduino, PlatformIO and their native SDKs.
Buying in multi-packs drops the per-board cost dramatically.

The short answer

The ESP32-S3 is a connected chip: dual-core, Wi-Fi and Bluetooth LE on the die, plenty of RAM with PSRAM, and vector instructions useful for small AI models. The STM32F411 'Black Pill' is a control chip: a Cortex-M4 with hardware floating point, predictable timing and a huge ecosystem in industry.

If your project talks to the internet, start with ESP32-S3. If it drives motors, reads sensors at precise intervals or runs on a battery for months, start with STM32.

ESP32-S3 strengths

Native USB, dual cores at 240MHz and up to 8MB of PSRAM make the S3 ideal for camera projects, voice assistants and dashboards that serve a web page.

ESP-IDF is mature, and the Arduino core makes prototyping fast.

Built-in Wi-Fi 4 + BLE 5
AI acceleration instructions
Large community and examples

STM32F411 strengths

The Black Pill packs a 100MHz Cortex-M4F with 512KB of flash into a breadboard-friendly board. Its timers and DMA make it excellent for motor control, audio and data acquisition.

STM32CubeIDE and HAL libraries are free, and the skills transfer directly to professional embedded jobs.

Adding sensors: distance and LiDAR

Both chips speak I2C and UART, so modules like time-of-flight LiDAR sensors plug straight in. A micro LiDAR gives robots and drones reliable distance readings up to 12 metres, far beyond ultrasonic sensors.

Pro tip: Run the LiDAR on a hardware UART rather than software serial for stable 1000Hz readings.

Verdict

Many serious builds use both: an STM32 for real-time control and an ESP32-S3 as the network co-processor. Keeping a few of each on the bench means you can start any project the day you get the idea.