Unexpected Maker NANOS3 might be the world’s tiniest ESP32-S3 module, yet fully-featured

Seon Rozenblum, better known as Unexpected Maker, has launched NANOS3  a development board that claims to be the world’s smallest, fully-featured ESP32-S3 module! This new module packs all the peripherals, and wireless connectivity features of an ESP32-S3 while being even smaller than the TinyPICO Nano. The module features two variants one with an onboard 3D antenna and the other with an u.FL connector.

Previously we have written about TinyS3, FeatherS3, and ProS3 boards from Unexpected Maker we have also covered many unique ESP32-S3 boards like the ESP32-S3 PowerFeather Board with solar input, the Waveshare ESP32-S3-Relay-6CH, the ESP32-S3 4G dev boards and more feel free to check those out if you are interested in ESP32 boards with advanced features.

Unexpected Maker NANOS3 A ESP32 S3 Powred Dev Board

Unexpected Maker NANOS3 Specifications

  • ESP32-S3-WROOM-1-N8R2
    • MCU – ESP32-S3 dual-core Tensilica LX7 up to 240 MHz with 512KB SRAM, 16 KB RTC SRAM
    • Memory – 2MB QSPI PSRAM
    • Storage – 8MB QSPI flash
    • Wireless – WiFi 4 and Bluetooth 5 LE + Mesh;
  • I/O
    • 2x 12-bit ADC
    • 3 DAC
    • 5x TX/RX PWM channels
    • Onboard RGB LED
    • NeoPixel Support (up to 1515 Neopixels)
    • 27x GPIO broken out with 1.27mm pitch castellated edges
    • JTAG Support
    • D+/D- pins for external USB connector
  • Power
    • 700mA 3.3V LDO Regulator
    • LiPo Battery Charging
    • Optimized power path for low-power battery usage
  • Antenna – Onboard 3D high gain antenna or external u.FL connector
  • Dimensions – 28 x 11 mm (the TinyPico Nano mesures 27 x 13 mm)
  • Release Date – July 2023
Unexpected Maker NANOS3 Pinout and Annotations
Unexpected Maker NANOS3 Pinout and Annotations

For simplicity, the company provides a pinout diagram along with parts annotation for the board. The pinout also shows USB and external Vin connections, making it easy to get started.

The NanoS3 ships with a UF2 bootloader and pre-installed CircuitPython, allowing for easy firmware updates. Other than that the board can also be programmed with MicroPython, ESP-IDF, and Arduino IDE. The company also provides a getting started guide for those who what to build applications around this board.

The board is completely open-sourced so files like 3D STEP files, KiCAD symbols and footprints, reference designs, PDF schematics, high-resolution pinout references, and much more can be found on the Unexpected Maker ESP32-S3 GitHub repository.

NanoS3 Carrier with NanoS3
NanoS3 Carrier Board

The is priced at USD$19.00 and can be found on Unexpected Makers web store, In the store you can also get an External uFL Antenna just for $1. For additional details and a comparison between the NanoS3 and TinyPICO Nano, visit their product page.

NanoS3 and TinoPICO Nano Comparison Table

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12 Replies to “Unexpected Maker NANOS3 might be the world’s tiniest ESP32-S3 module, yet fully-featured”

    1. M5 Stamp is missing much of what is on the NanoS3 – and the NanoS3 is still smaller – maybe read the M5 Stack specs? M5 Stamp is 26x18mm (468mm2) versus 28x11mm (308mm2) for the NanoS3.

    1. If using a PICO-1, all you gain is the removal of the XTAL which leads to zero gains in space on the board – so no, it really wouldn’t allow it to be even smaller – I know this because I designed a version with the PICO-1-N8R2 when I first got samples moons ago, just to see 🙂

  1. What makes it small is the included power management, because usually you start with a small board, you notice it requires 3.3V input while you’re on battery. You pick one with the included regulator from 3.3-5V input, and you figure that you still don’t have anything to charge your battery, and you end up stacking many boards just for this.

    1. XIAO S3 is 21×17.5mm (367mm2) which is still bigger than the NanoS3 28x11mm (308mm2), and it only has 11x GPIO instead of 27x on the NanoS3, No RGB LED, and no onboard antenna version.

      1. A few days ago, I ordered the Chinese version of the S3 Supermini for testing. Dimensions: 23.5×18 mm. 35 GPIOs, battery support and built-in antenna 😏

        1. The S3 doesn’t have 35 usable IO – Internal flash uses 5 of them, and then if it has internal PSRAM, that’s either 1 more or 5 more depending on if it’s Quad or Octal, so the S3 Supermini can’t give you 35 usable IO, even though they break them out. Max usable is 29, or 25 with Octal PSRAM.

    1. lol, Where’s the 3v3 regulator? Where’s the battery charging? The RGB LED? Did you look at the NanoS3 specs at all?

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