The Arduino Nano RP2040 Connect and ESP32-C6 are both capable wireless microcontroller platforms, but they represent almost opposite design philosophies.
Nano RP2040 Connect combines two separate processors:
ESP32-C6 integrates the application CPU and modern radio system into a single SoC:
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ESP32-C6 → 160 MHz RISC-V CPU → Wi-Fi 6 → Bluetooth LE → IEEE 802.15.4 → Thread → Zigbee |
The Nano’s defining strength is RP2040 PIO plus its rich onboard hardware: IMU, microphone, secure element and 16 MB Flash.
ESP32-C6’s defining strength is its modern multi-protocol radio architecture, especially native Thread/Matter and Wi-Fi 6.
Quick Comparison
| Feature | Nano RP2040 Connect | ESP32-C6 |
|---|---|---|
| Main application MCU | RP2040 | ESP32-C6 |
| Main CPU | Dual Cortex-M0+ | 32-bit RISC-V |
| Main clock | 133 MHz | Up to 160 MHz |
| Low-power CPU | No separate LP core | 20 MHz LP RISC-V core |
| SRAM | 264 kB | 512 kB + 16 kB LP SRAM |
| Flash | 16 MB onboard QSPI | External Flash; common DevKitC-1 uses 8 MB |
| Wi-Fi | 2.4 GHz via NINA-W102 | Integrated 2.4 GHz Wi-Fi 6 |
| Bluetooth | Via NINA-W102 | Integrated BLE |
| IEEE 802.15.4 | No | Yes |
| Thread | No native Thread radio | Yes |
| Matter over Thread | No | Yes |
| Zigbee | No | Yes |
| ESP-NOW | Not a normal RP2040-side feature | Yes |
| PIO | 2 blocks, 8 state machines | No RP2040-style PIO |
| ADC | 4 native RP2040 ADC + 4 NINA-assisted analog inputs | 12-bit ADC, up to 7 external channels depending on package/board |
| DAC | No true DAC | No true DAC |
| IMU | LSM6DSOX onboard | Board-dependent; not part of SoC |
| Microphone | MP34DT06J onboard | Board-dependent; not part of SoC |
| Security | ATECC608A + RP2040 platform | Secure boot, Flash encryption, eFuses, crypto hardware |
| 2026 status | Arduino marks board End of Life | Current Espressif platform |
The Architecture Difference Is Fundamental
Nano RP2040 Connect uses a two-chip wireless design.
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your sketch ↓ RP2040 ↓ WiFiNINA / wireless control protocol ↓ NINA-W102 ↓ Wi-Fi / Bluetooth radio |
The NINA-W102 is itself based on an ESP32-class processor, but in normal Nano RP2040 Connect use it behaves as a wireless coprocessor.
ESP32-C6 is much more integrated:
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your sketch ↓ ESP32-C6 ├── Wi-Fi 6 ├── BLE ├── Thread ├── Zigbee ├── GPIO └── application code |
That integrated architecture gives ESP32-C6 direct access to its networking stacks without a separate wireless firmware layer.
CPU: RP2040 Dual-Core vs ESP32-C6 RISC-V
RP2040 provides:
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2 × Cortex-M0+ 133 MHz 264 kB SRAM |
ESP32-C6 provides:
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1 × high-performance RISC-V core up to 160 MHz 1 × low-power RISC-V core up to 20 MHz 512 kB high-performance SRAM 16 kB low-power SRAM |
The two architectures are difficult to compare by clock frequency alone.
RP2040’s dual cores are attractive for splitting deterministic workloads across two processors.
ESP32-C6’s faster modern RISC-V core and larger memory are better suited to complex networking, cryptography and RTOS-heavy IoT applications.
Memory: Nano Has More Flash, C6 Has More RAM
Nano RP2040 Connect includes:
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16 MB QSPI Flash 264 kB SRAM |
ESP32-C6 contains:
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512 kB SRAM 16 kB LP SRAM |
and uses external Flash selected by the module/board manufacturer.
A common ESP32-C6-DevKitC-1 configuration provides:
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8 MB Flash |
So the Nano gives more onboard storage than many common C6 development boards, while ESP32-C6 gives significantly more working RAM.
Why RAM Matters for Wireless Workloads
Wireless applications consume RAM for:
- TCP/IP buffers;
- TLS;
- MQTT queues;
- Matter data structures;
- Thread networking;
- BLE services;
- JSON documents.
ESP32-C6’s larger SRAM therefore matters more than the modest clock-speed difference in many connected applications.
PIO Is the Nano’s Biggest Architectural Advantage
RP2040 contains:
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2 PIO blocks 4 state machines each 8 state machines total |
PIO can implement custom digital protocols independently of the Cortex-M0+ cores.
Typical uses include:
- WS2812 / NeoPixel output;
- quadrature encoders;
- custom serial protocols;
- additional UARTs;
- unusual SPI modes;
- precise pulse capture;
- stepper timing;
- high-speed deterministic I/O.
ESP32-C6 Has No Direct PIO Equivalent
ESP32-C6 instead provides specialised peripherals such as:
- RMT;
- LEDC PWM;
- MCPWM;
- SPI;
- I²C;
- UART;
- I²S;
- TWAI;
- GPIO matrix routing.
These are powerful, but they are not the same as a tiny programmable state-machine subsystem.
If the project relies on an unusual protocol that PIO can implement elegantly, Nano RP2040 Connect can still be more attractive.
Wi-Fi: ESP32-C6 Is More Modern
Nano RP2040 Connect uses the NINA-W102 for 2.4 GHz Wi-Fi.
ESP32-C6 integrates:
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2.4 GHz Wi-Fi 6 802.11ax |
with backward compatibility for older 2.4 GHz Wi-Fi networks.
Wi-Fi 6 adds features such as:
- OFDMA;
- improved efficiency in busy networks;
- Target Wake Time support;
- modern IoT-oriented power-management features.
Bluetooth
Both platforms support Bluetooth Low Energy.
On Nano RP2040 Connect, BLE is provided by the NINA-W102 coprocessor.
On ESP32-C6, BLE is part of the integrated wireless subsystem.
This generally makes BLE development more direct on ESP32-C6, especially when combining BLE with Thread or Matter commissioning.
Thread Is the C6’s Biggest Wireless Advantage
ESP32-C6 integrates an:
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IEEE 802.15.4 radio |
which provides the hardware foundation for:
- Thread;
- Matter over Thread;
- Zigbee.
Nano RP2040 Connect has no 802.15.4 radio.
So it cannot become a native Thread endpoint without adding external radio hardware.
Matter over Thread in Current Arduino-ESP32
In the current Arduino-ESP32 core, ESP32-C6 supports Matter-over-Thread directly.
The Matter API can select Thread as the network transport:
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Matter.selectNetwork(MATTER_NETWORK_THREAD); |
This is a major difference from older ESP32-S3-class boards, which lack native 802.15.4.
Matter Is Not the Same as Thread
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Matter = application/device protocol Thread = low-power IPv6 mesh network BLE = commonly used for commissioning |
ESP32-C6 can participate in all three layers required for a Matter-over-Thread endpoint.
Zigbee
ESP32-C6 also supports Zigbee through Espressif’s current Zigbee stack.
Nano RP2040 Connect does not contain the required IEEE 802.15.4 radio.
For new smart-home development, this is a decisive platform difference.
ESP-NOW
ESP32-C6 supports:
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ESP-NOW |
for direct peer-to-peer ESP-family communication.
Nano RP2040 Connect’s NINA-W102 is based on ESP32 hardware, but ESP-NOW is not exposed as a normal RP2040-side feature through the standard WiFiNINA workflow.
Nano RP2040 Connect Has Far More Onboard Sensors
Arduino included:
- LSM6DSOX 6-axis IMU;
- MP34DT06J digital microphone;
- ATECC608A secure element;
- RGB LED;
- 16 MB Flash.
Most generic ESP32-C6 development boards include none of those sensors.
You add them externally as required.
IMU: LSM6DSOX
The Nano’s LSM6DSOX provides:
- 3-axis accelerometer;
- 3-axis gyroscope;
- embedded motion functions;
- machine-learning features.
This makes the Nano attractive for motion projects without adding any external sensor board.
Microphone
The onboard:
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MP34DT06J |
PDM microphone supports:
- audio classification;
- keyword spotting;
- sound-level monitoring;
- TinyML.
Again, a normal ESP32-C6 development board needs an external microphone.
ADC Architecture
Nano RP2040 Connect exposes eight Nano-style analog labels:
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A0-A7 |
but only:
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A0-A3 |
are native RP2040 ADC inputs.
The additional:
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A4-A7 |
use the NINA-W102 analog path.
ESP32-C6 ADC
ESP32-C6 includes a 12-bit SAR ADC.
Espressif documents seven external ADC channels on:
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GPIO0-GPIO6 |
for the common package configuration.
The exact pins exposed depend on the board.
No True DAC on Either Platform
Neither RP2040 nor ESP32-C6 includes a conventional voltage DAC.
For true analog output, both require:
- external DAC;
- PWM plus filtering;
- digital audio DAC/codec.
USB
Nano RP2040 Connect provides native RP2040 USB through Micro-USB.
ESP32-C6 provides native:
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USB Serial/JTAG |
and many development boards expose this through USB-C.
ESP32-C6’s integrated JTAG path is especially convenient for debugging.
Debugging
ESP32-C6 has a stronger standard debugging story because USB Serial/JTAG is built into the SoC.
That gives direct access to:
- flashing;
- serial console;
- JTAG debugging.
Nano RP2040 Connect can be debugged through RP2040 SWD pads, but the normal Arduino workflow is more upload/serial oriented.
Security
Nano RP2040 Connect adds the:
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ATECC608A |
secure element for protected key storage and cryptographic operations.
ESP32-C6 instead provides extensive SoC-level security including:
- secure boot;
- Flash encryption;
- eFuses;
- hardware cryptography;
- random-number generation;
- secure key storage mechanisms.
Both can support secure IoT designs, but their security architectures are different.
Power and Low-Power Design
Nano RP2040 Connect is a feature-rich development board with multiple onboard components.
That convenience comes with board-level power overhead from:
- NINA-W102;
- IMU;
- microphone;
- secure element;
- LEDs and regulation.
ESP32-C6 was designed specifically with modern low-power IoT in mind and includes a low-power RISC-V core plus low-power SRAM and peripherals.
Wi-Fi 6 Target Wake Time
ESP32-C6 supports Wi-Fi 6 features such as Target Wake Time.
This can reduce active radio time in compatible applications and infrastructure.
For battery-powered Wi-Fi nodes, this is a more modern foundation than the older NINA-W102 generation.
Arduino Software Ecosystem
Nano RP2040 Connect
The normal stack uses:
- Arduino Mbed core;
- WiFiNINA;
- ArduinoBLE;
- PDM;
- Arduino_LSM6DSOX;
- MicroPython.
ESP32-C6
The current ecosystem includes:
- Arduino-ESP32;
- WiFi;
- BLE;
- ESP-NOW;
- OpenThread;
- Matter;
- Zigbee;
- ESP-IDF;
- ESP-Matter.
For a new connected project, the C6 software ecosystem is broader and more actively aligned with current smart-home radio standards.
MicroPython
Nano RP2040 Connect has official Arduino-documented MicroPython support and a generous 16 MB Flash filesystem.
ESP32-C6 also has MicroPython support in the broader ESP32 ecosystem, but Nano RP2040 Connect’s large Flash remains attractive for Python-heavy storage needs.
Which Is Better for Custom I/O?
Nano RP2040 Connect wins when the project depends on:
- PIO;
- precise deterministic digital timing;
- custom serial protocols;
- non-standard bus decoding;
- extra software-defined peripherals.
Which Is Better for Smart Home?
ESP32-C6.
It directly supports the radio technologies that now matter most:
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Wi-Fi 6 BLE Thread Matter over Thread Zigbee |
Nano RP2040 Connect can handle Wi-Fi/BLE IoT well, but it cannot become a native Thread/Zigbee node by itself.
Which Is Better for TinyML Sensor Projects?
Nano RP2040 Connect has a strong out-of-box advantage because it already includes:
- IMU;
- microphone;
- 16 MB Flash.
ESP32-C6 has more RAM and a faster main CPU, but the required sensors must normally be added externally.
Which Is Better for Wireless Flexibility?
ESP32-C6 wins decisively.
The same chip can support:
- normal Wi-Fi IoT;
- BLE peripherals;
- ESP-NOW;
- Thread endpoints;
- Matter-over-Thread;
- Zigbee devices.
Which Is Better for a Long-Term New Product?
ESP32-C6 is easier to justify because Nano RP2040 Connect is now listed by Arduino as:
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End of Life |
The Nano remains useful for existing deployments and hobby projects, but EOL status matters for:
- future availability;
- production sourcing;
- new PCB designs;
- long-lived commercial products.
Which Is Better for Existing Nano RP2040 Projects?
If you already depend on:
- Nano carrier boards;
- WiFiNINA;
- LSM6DSOX;
- PDM microphone;
- PIO code;
staying on Nano RP2040 Connect may be much simpler than redesigning around ESP32-C6.
Migration Considerations
Moving from Nano RP2040 Connect to ESP32-C6 requires review of:
- pin assignments;
- 3.3 V power rails;
- WiFiNINA code;
- ArduinoBLE code;
- PIO-dependent functionality;
- onboard IMU/microphone replacements;
- Flash/storage assumptions;
- USB/debug workflow.
High-level Arduino APIs such as:
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digitalWrite() digitalRead() Wire SPI Serial |
are the easiest parts to move.
Decision Table
| Requirement | Better fit |
|---|---|
| RP2040 PIO | Nano RP2040 Connect |
| Onboard IMU | Nano RP2040 Connect |
| Onboard microphone | Nano RP2040 Connect |
| 16 MB onboard Flash | Nano RP2040 Connect |
| Dedicated ATECC608A | Nano RP2040 Connect |
| Wi-Fi 6 | ESP32-C6 |
| Native Thread | ESP32-C6 |
| Matter over Thread | ESP32-C6 |
| Zigbee | ESP32-C6 |
| ESP-NOW | ESP32-C6 |
| More SRAM | ESP32-C6 |
| Integrated USB/JTAG | ESP32-C6 |
| Modern smart-home platform | ESP32-C6 |
| Existing Nano carrier compatibility | Nano RP2040 Connect |
| New long-term design | ESP32-C6 |
Quick Reference
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Nano RP2040 Connect RP2040 dual Cortex-M0+ 133 MHz 264 kB SRAM 16 MB Flash 8 PIO state machines NINA-W102 Wi-Fi Bluetooth no native 802.15.4 no native Thread no Zigbee A0-A3 native ADC A4-A7 NINA-assisted analog LSM6DSOX IMU MP34DT06J microphone ATECC608A Micro-USB End of Life ESP32-C6 32-bit RISC-V up to 160 MHz HP core 20 MHz LP core 512 kB HP SRAM 16 kB LP SRAM external Flash Wi-Fi 6 BLE IEEE 802.15.4 Thread Matter over Thread Zigbee ESP-NOW 12-bit ADC no true DAC USB Serial/JTAG current platform |
Final Thoughts
Nano RP2040 Connect remains an unusual and capable board because it combines:
- RP2040 PIO;
- 16 MB Flash;
- Wi-Fi/Bluetooth through NINA;
- an IMU;
- a microphone;
- a secure element.
For deterministic custom I/O or self-contained TinyML sensor projects, those features still make it useful.
ESP32-C6 is the stronger foundation for a new wireless product because its radio architecture is much more current.
It combines:
- Wi-Fi 6;
- BLE;
- Thread;
- Matter-over-Thread;
- Zigbee;
- ESP-NOW;
- larger SRAM;
- integrated USB/JTAG.
The simplest decision rule in 2026 is:
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Need PIO or Nano's onboard IMU/mic? → Nano RP2040 Connect Need modern multi-protocol wireless or Matter/Thread/Zigbee? → ESP32-C6 |
For detailed pinouts, see our Nano RP2040 Connect pinout guide and ESP32-C6 DevKitC-1 pinout guide.