# Elecrow Pi 400 GPIO adapter: specs

> A small adapter from Elecrow that extends the 40-pin GPIO header of a Raspberry Pi 400 (2x20 pin header expansion). The Raspberry Pi 400 is a…

[HTML version](https://soldr.ai/docs/boards/elecrow-pi-400-gpio-adapter)

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A small adapter from Elecrow that extends the 40-pin GPIO header of a Raspberry Pi 400 (2x20 pin header expansion). The Raspberry Pi 400 is a separate computer.

Every value cites its sourcePinout not published

[Buy on Compoden](https://compoden.com/products/elecrow-raspberry-pi-400-gpio-header-adapter)

## Specs

| Spec | Value | Source |
|---|---|---|
| Header | 2x20 pin header (Raspberry Pi 400 GPIO header adapter / header expansion) | source Elecrow product page 'Raspberry Pi 400 GPIO Header Adapter', Description and Specification |
| Size | 5.5 x 4.8 cm | source Elecrow product page 'Raspberry Pi 400 GPIO Header Adapter', Description and Specification |
| Weight | 18 g | source Elecrow product page 'Raspberry Pi 400 GPIO Header Adapter', Description and Specification |
| Host computer's header (Raspberry Pi 400) | Horizontal 40-pin GPIO header | source Raspberry Pi 400 product brief, Specification, p.2 |
| Host computer's power (Raspberry Pi 400) | 5 V DC via USB connector | source Raspberry Pi 400 product brief, Specification, p.2 |
| Host computer's operating temperature (Raspberry Pi 400) | 0 C to +50 C | source Raspberry Pi 400 product brief, Specification, p.2 |

## Pinout
We don't publish a pin table for this part: no official source we could verify gives one. Check the labels printed on your module, and see the notes below.

Elecrow's page gives the header as 2x20 pin but no pin table for the adapter. Use the Raspberry Pi's own GPIO pinout from raspberrypi.com/documentation for the signals.

## Build with it
Project ideas for the Elecrow Pi 400 GPIO adapter. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.

- [Keypad input for a Raspberry Pi 400](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20keypad%20input%20for%20a%20Raspberry%20Pi%20400%20with%20a%20GPIO%20header%20adapter%20and%20a%204x4%20matrix%20keypad): A membrane keypad is passive and needs no supply, so it is safe on 3.3 V GPIO pins. Needs a Raspberry Pi 400 as the host. The adapter's pin gender is not stated, so the jumper set includes male and female ends.
- [LED indicator board](https://app.soldr.ai/?prompt=I%20want%20to%20build%20an%20LED%20indicator%20board%20for%20a%20Raspberry%20Pi%20400%20with%20a%20GPIO%20header%20adapter%2C%20assorted%20LEDs%20and%20resistors): Each LED needs its own series resistor sized for the 3.3 V GPIO level, and the breadboard gives you somewhere to wire from the header. Needs a Raspberry Pi 400 as the host. The adapter's pin gender is not stated, so the jumper set includes male and female ends.
- [Offline clock for a Raspberry Pi 400](https://app.soldr.ai/?prompt=I%20want%20to%20build%20a%20battery-backed%20clock%20for%20a%20Raspberry%20Pi%20400%20with%20a%20GPIO%20header%20adapter%20and%20a%20DS3231%20module): The DS3231 module is an I2C part; the Pi header has I2C pins. Power the DS3231 from the Pi's 3.3 V pin so its I2C lines stay at 3.3 V. Needs a Raspberry Pi 400 as the host. The adapter's pin gender is not stated, so the jumper set includes male and female ends.

## Common mistakes

- Treating the adapter as a level shifter: Elecrow's page describes it only as a header adapter/expansion, so keep every signal at the Raspberry Pi's own 3.3 V GPIO level (source: [link](https://web.archive.org/web/20260610004438/https://www.elecrow.com/raspberry-pi-400-gpio-header-adapter.html), Description)
- Plugging the adapter on offset by one row: it is a 2x20 pin header, so check pin 1 against the Raspberry Pi's pinout before power-up (source: [link](https://web.archive.org/web/20260610004438/https://www.elecrow.com/raspberry-pi-400-gpio-header-adapter.html), Description; header per [link](https://datasheets.raspberrypi.com/rpi400/raspberry-pi-400-product-brief.pdf))

## Not covered by the official source

- Elecrow's page gives only the header type, size and weight; no pin table, supply or connector height.
- The page lists weight 18 g under Specification and 38 g in the product summary; 18 g is used.
- A Raspberry Pi 400 is needed as the host for every idea.

## Sources

- [link](https://web.archive.org/web/20260610004438/https://www.elecrow.com/raspberry-pi-400-gpio-header-adapter.html) (Elecrow product page, archived 10 Jun 2026; original [link](https://www.elecrow.com/raspberry-pi-400-gpio-header-adapter.html); maker's own page via the Internet Archive)
- [link](https://datasheets.raspberrypi.com/rpi400/raspberry-pi-400-product-brief.pdf) (Raspberry Pi 400 product brief)