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Tiny green circuit board with USB-C port and pre-soldered header pins

WaveShare

WaveShare RP2040-Zero Mini Board with Pre-Soldered Header

SKU CH-4NVV-H7P29

Tiny RP2040 microcontroller board with pre-soldered headers, dual-core Cortex-M0+ up to 133 MHz, 2 MB flash, 29 GPIOs and USB-C for drag-and-drop programming

  • Dual-core Arm Cortex M0+ runs up to 133 MHz
  • 2 MB flash plus 264 KB SRAM stores your code and data
  • 29 multi-function GPIOs with 20 on the edge pinout for easy wiring
  • Castellated module design enables direct SMD soldering to carrier boards
  • USB Type-C connector supports drag-and-drop mass-storage programming

RP2040-Zero Mini Board for Embedded Projects

The RP2040-Zero is a compact development board built around the Raspberry Pi RP2040 microcontroller. It targets makers and engineers who need a small, castellated module for surface-mount integration. A dual-core Arm Cortex M0+ processor runs up to 133 MHz with 264KB SRAM and 2MB Flash onboard. The pre-soldered header and USB Type-C connector simplify immediate prototyping.

Step Up from Larger Pico Form Factors

This board replaces full-size Pico boards when space is tight and direct soldering to a carrier PCB is preferred. The castellated edges allow reflow assembly without through-hole pins. The jump is worth it when a project demands a minimal footprint and the 29 multi-function GPIO pins (20 via edge pinout) meet the I/O requirement. Drag-and-drop USB 1.1 programming remains unchanged.

Fits Tight Carrier Board Designs

The module fits into custom carrier boards as an SMD component, freeing layout space compared to header-based modules. It needs a carrier that breaks out the castellated pads for power, USB, and the 20 edge GPIOs. The 2×SPI, 2×I2C, 2×UART, 4×ADC and 16×PWM channels connect directly to the carrier. Low-power sleep and dormant modes help battery-operated builds.

How it compares

Measured against everything we stock in Single-Board Computers & Dev Kits, at today’s prices. Recalculated every night.

Price $35.99
Cheaper than about 62% of the 1,420 comparable items (median $44.99).

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Specifications

Processor
ProcessorOther

Questions about this item

How wide is the castellated edge so I can design a matching carrier board footprint?

The module uses a standard castellated edge with 20 pins along the perimeter for SMD mounting onto a carrier board.

Which step do people miss when putting the pre-soldered header onto a breadboard for the first time?

Align the 20 edge pins with the breadboard rows, press straight down until the header shoulders sit flush, then verify the USB-C port faces outward for cable access.

When will the onboard 2 MB flash need to be rewritten during long-term use?

The 2 MB flash stores firmware; rewrite it only when you upload a new program via the USB mass-storage drag-and-drop method.

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