TinkerNewsWeekly · DIY electronicsEst. 2025
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ESP32 vs RP2040: which microcontroller for your next build?

The ESP32 puts Wi-Fi and Bluetooth on a dual-core Xtensa chip; the RP2040 is a radio-less dual-core Arm design whose party trick is programmable I/O. The differences that decide a build are the radios, the memory and how you intend to power the board. This page compares both on their official datasheets and says plainly which to choose.

Specs checked

Specifications

2 options
SpecificationESP32RP2040
MCUXtensa LX6, 32-bitArm Cortex-M0+, 32-bit
Cores / clockDual-core, up to 240 MHzDual-core, up to 133 MHz
RAM / flash520 KB SRAM and 448 KB ROM on the chip; firmware lives in external flash, typically 4 MB on modules264 KB SRAM in six banks; firmware runs from external QSPI flash — 2 MB on Pico boards
RadiosWi-Fi 802.11 b/g/n (2.4 GHz), Bluetooth 4.2 BR/EDR and Bluetooth LENone on the chip. The Pico W adds 2.4 GHz Wi-Fi (802.11n) and Bluetooth 5.2 on board
Voltage2.3–3.6 V; Espressif recommends a 3.3 V supply able to deliver 500 mA or more1.8–3.3 V I/O and regulator input; Pico boards accept about 1.8–5.5 V on VSYS and generate 3.3 V themselves
Typical powerDeep-sleep 10 µA (RTC timer and memory retained), light-sleep 0.8 mA, modem-sleep roughly 20–31 mA; Wi-Fi transmit is the heavy, spiky partSLEEP and DORMANT states rather than a published deep-sleep figure; battery life depends on the board around the chip
Price classBudget. Dev-board prices vary by vendor; there is no single official priceBudget. Raspberry Pi publishes $4 for the Pico and $6 for the Pico W

Figures are typical values from the linked sources, not guarantees. Prices are the manufacturers’ published prices where they publish one; resellers vary.

How to choose

From the specs

Choose the ESP32 when…

  • The project needs Wi-Fi or Bluetooth: the radio is on the chip and the frameworks (ESP-IDF, Arduino) carry the stacks.
  • It sleeps between wakes on a battery: deep-sleep is a documented 10 µA with the RTC timer and memory kept.
  • It needs room to work while awake: 520 KB SRAM leaves space for TLS, audio and network buffers.

Choose the RP2040 when…

  • The project is about I/O: its PIO state machines produce interfaces the ESP32 cannot, from LED protocols to VGA.
  • You want cores and GPIO without a radio to configure, certify or power.
  • The board lives on a wide-ish supply: Pico boards run from about 1.8 V to 5.5 V into VSYS, including a single Li-ion cell.

Where to go next

6 builds

A 3D-Printed Planter That Monitors Indoor CO₂

Behind its geometric planter shell, murCO uses an ESP32-based controller and SCD40 sensor to send local CO₂, temperature, and humidity readings to Home Assistant. LEDs, optional speech, and Bluetooth proxy features make ventilation information useful without depending on a dashboard. The open-source repository and project documentation provide implementation details.

Read the build on openelab.io: A 3D-Printed Planter That Monitors Indoor CO₂

Build an ESP32 Sparkle Motion Light

Tiny points of colored light can feel surprisingly alive when they move, fade, and sparkle independently. This project pairs an ESP32-based Adafruit board with addressable LEDs and CircuitPython, giving makers a hands-on way to build an animated display, then adjust its colors, timing, brightness, and physical form.

Read the build on cdn-learn.adafruit.com: Build an ESP32 Sparkle Motion Light

Reliable ESP-NOW RC Car With ESP32 and ESP8266

At 2.02 volts, a battery pack exposed the gap between firmware’s “protected” message and real electrical safety. This ESP-NOW RC car pairs an ESP32 controller with an ESP8266 vehicle board, then adds packet checks, acknowledgements, failsafes, pairing, and hard-won debugging lessons from actual hardware faults.

Read the build on learniot.in: Reliable ESP-NOW RC Car With ESP32 and ESP8266

Build an ESP32 MAX30102 Vital Signs Sensor

Three useful readings come from one fingertip module: heart rate, SpO2, and temperature. This ESP32 project covers the wiring, Arduino sketches, and optical sensing behind each value. It is a practical introduction to I2C and physiological data, but the results are experimental and not suitable for medical diagnosis.

Read the build on randomnerdtutorials.com: Build an ESP32 MAX30102 Vital Signs Sensor

Build an ESP32 Cooker Whistle Counter

Pressure-cooker whistles are easy to miss when the kitchen gets busy. This ESP32 project uses a MAX4466 microphone to count sound events, then sends a WhatsApp message through CircuitDigest Cloud when the selected count is reached. It needs careful calibration, reliable Wi-Fi, and continued supervision around the cooker.

Read the build on circuitdigest.com: Build an ESP32 Cooker Whistle Counter

ESP32 Tesla BLE Control with Home Assistant

Turn an ESP32 into a local Tesla BLE bridge with ESPHome and Home Assistant. This project brings charging controls, vehicle data, and diagnostics into a dashboard, while keeping communication nearby. Start with the tested YAML example, check pairing and range, and protect every command that can affect the car.

Read the build on github.com: ESP32 Tesla BLE Control with Home Assistant

Sources

6 documents