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# Nano Base Board (B) for Raspberry Pi Compute Module 4

**Type:** Product page · **SKU:** WS-21726 · **Brand:** [Waveshare](https://core-electronics.com.au/brands/waveshare-in-australia)
**Page:** https://core-electronics.com.au/nano-base-board-b-for-raspberry-pi-compute-module-4.html ([markdown](https://core-electronics.com.au/nano-base-board-b-for-raspberry-pi-compute-module-4.html.md))

Everything your Compute Module 4 needs – Ethernet, HDMI, camera and display – on a board no bigger than the module itself.

## Pricing

- **Price:** $24.09 (inc GST) — $21.90 AUD, exc GST

## Availability & dispatch

- Available with a lead time — expect dispatch between Oct 21 and Oct 28.

## How to buy

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## Description

A complete carrier board that's barely bigger than the Compute Module it hosts. At just 56 × 41 mm, it sits directly under a Raspberry Pi CM4 and breaks out Gigabit Ethernet, 4K HDMI, USB, camera, display, audio and the full 40-pin GPIO header – no oversized IO board required.

The official CM4 IO Board is perfect on the bench, but it's far too big to drop into a finished product. This board closes that gap: evaluate your CM4 with the interfaces you actually need, then build the same compact board into your enclosure, robot or kiosk.

It suits every Compute Module 4 variant. Lite (no eMMC) modules boot from the onboard microSD slot, while eMMC modules can be flashed over USB-C – just flip the BOOT switch and use rpiboot to mount the eMMC as a USB mass-storage drive.

Getting started is simple:

- Seat your CM4 in the board-to-board socket
- Insert a flashed microSD card (Lite) or flash the eMMC over USB-C with BOOT set to ON
- Set BOOT to OFF and power up with a 5V USB-C supply
 
### Features

- Keeps your build tiny – the board matches the footprint of the CM4, so the whole system is only slightly larger than the module
- Fast, reliable wired networking through a Gigabit Ethernet RJ45 port
- Drive a monitor at up to 4K 30fps via the Mini HDMI port
- Add vision and a local screen with MIPI CSI-2 camera and MIPI DSI display connectors (15-pin, 1.0 mm FPC)
- Works with the huge range of Raspberry Pi HATs through the standard 40-pin GPIO header
- Plug in keyboards, storage or dongles via the USB 2.0 Type-A port
- Hear system audio through the 3.5 mm audio jack
- Flash eMMC modules without extra hardware – the BOOT switch routes USB to the USB-C port for rpiboot programming
- Onboard user button for your own interface or shutdown controls
 
### Specifications

 | Property | Specification |
|---|---|
| Compatible modules | All Raspberry Pi Compute Module 4 variants (Lite/eMMC, wireless/non-wireless) |
| Networking | Gigabit Ethernet, RJ45 |
| GPIO | Raspberry Pi 40-pin GPIO header × 1 |
| USB | USB 2.0 Type-A × 1 |
| Video output | Mini HDMI × 1, up to 4K 30fps |
| Display | MIPI DSI × 1 (15-pin, 1.0 mm FPC) |
| Camera | MIPI CSI-2 × 1 (15-pin, 1.0 mm FPC) |
| Audio | 3.5 mm jack |
| Storage | microSD card slot (for CM4 Lite variants) |
| Power input | 5V via USB-C (also used for eMMC flashing) |
| Controls | BOOT switch, user button |
| Dimensions | 56 × 41 mm |
| Weight | 19 g |

Note: the Compute Module 4 and power supply are not included.

### Resources

- [Waveshare CM4-NANO-B Wiki](https://www.waveshare.com/wiki/CM4-NANO-B) – schematics, dimensions and setup guides
 
### What's Included

- 1x Nano Base Board (B) for CM4
- 1x 2x20-pin colour-coded straight pin header

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/W/S/WS-21726_ecommerce_1791239625699.jpg)