The Nano Base Board A from Waveshare is a simple, affordable way to evaluate the Raspberry Pi Compute Module 4, breaking out key functionality whilst maintaining a compact and low-profile footprint - the same size as the CM4 itself! This board allows you to power your CM4 via USB-C whilst also providing a USB port, CSI camera connector, SD card slot, GPIO breakout, boot switch and indication LEDs. We also stock the Nano Base Board (B) which offers more functionality (but costs a little more). Note: the GPIO header is packed with the board separately and will require soldering! Features The Base Board A is the same overall size as the CM4 module yet offers a host of useful features: * 40-pin GPIO breakout * Male colour-coded GPIO pins (packaged separately - requires soldering) * USB-C 5V power port * CSI port for Raspberry Pi Camera Modules * MicroSD card socket for CM4 Lite variants * 1x USB 2.0 port * Boot switch * Power indication LED * Activity Indication LED * Dimensions: 55mm x 40mm What's Onboard? 1) CM4 socket - Suitable for all variants of Compute Module 4 2) Power supply / Programming - 5V power supply, or used for eMMC burning 3) Micro SD card slot - For connecting a Micro SD card with pre-burnt image (Lite variant ONLY) 4) CSI interface - 1 × MIPI CSI camera interface 5) USB2.0 interface - For connecting sorts of USB devices 6) 40-pin GPIO interface - Suitable for connecting to various HAT modules 7) PWR indicator - CM4 power status 8) ACT indicator - CM4 working status 9) AMS1117-3.3 10) BOOT switch - ON: Switch USB to Type C interface, will enter download mode when powered on (configured as a large-capacity disk through RPI boot) - OFF: Switch USB to Type A interface, will not enter download mode when powered on (booted from eMMC or Micro SD card) Package Contents * 1x Nano Base Board (A) for CM4 * 1x 40-pin colour-coded GPIO header Compute Module 4 not included Resources * Product Wiki https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2023-03-07 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2023-12-27 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2024-09-18 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2024-11-29 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2024-11-30 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2025-08-06 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2025-11-28 https://elecena.pl/product/22726725/nano-base-board-a-for-raspberry-pi-cm4 2025-11-29