does this device allow 5v or 3.3v on the input and output pins?

Definitely not 5 volt compliant. According to the Raspberry RP2040 chip spec the maximum digital input voltage is IOVDD +0.3 VOLTS. Since the maximum IOVDD is 3.63 volts, the absolute max would be 3.93 volts.

Does it come with pin connectors?

mine came with two sets of header pins which you must solder in place if you wish to use them.

Can you use this with accelerometer to make a spirit level?

Sure. You would also need a display and a battery. Or use a USB cable and display on a computer. But this would be overkill if it weren't so hard to get old cheap chips these days. It's fine for a one off, but if you're thinking of production, check out things like older PIC an AT-Tiny parts. But if it's an actual spirit level you want, just buy one. If this is for inside a vehicle or robot, beware that accelerometers can only detect level in an unaccelerated frame (such as stationary, or constant speed including no turning).

what board choice in Arduino for code uploading? Does not upload as Uno

In Auruino IDE, go to board selection, board manager and search for Seeed RP2040 boards. Download and install. Restart Arduino for it to recognize new libraries.

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Seeed Studio XIAO RP2040 マイクロコントローラー、デュアルコアARM Cortex M0+プロセッサー付き、Arduino、MicroPython、CircuitPython、豊富なインターフェースに対応。

Product ID: 729398108

Details

CPUスピード
133 MHz
インストール済みのRAMメモリサイズ
264 KB
ブランド
seeed studio
メモリストレージ容量
2 MB
モデル名
XIAO RP2040

⚡Dual-core ARM Cortex M0+ @133MHz

💾2MB onboard flash + 264KB SRAM

🔌11 digital + 4 analog + multi-interface pins

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Description

🚀 Tiny Titan: Power-packed microcontroller that fits in your palm, ready to elevate your next-gen projects!

INTERFACE GALORE - Equipped with 11 digital pins, 4 analog pins, PWM, I2C, UART, SPI, and SWD interfaces for ultimate connectivity and flexibility.
MEMORY TO MASTER - Packed with 2MB onboard flash and 264KB SRAM, ensuring ample space for complex code and smooth multitasking.
COMPACT VERSATILE - Thumb-sized (20x17.5mm) design fits perfectly into wearable tech and compact projects without compromise.
POWERHOUSE PERFORMANCE - Dual-core ARM Cortex M0+ processor running up to 133MHz delivers lightning-fast execution for your most demanding projects.
SEAMLESS COMPATIBILITY - Fully supports Arduino, MicroPython, CircuitPython, and is pin-compatible with Seeeduino XIAO expansion boards for effortless integration.

The Seeed Studio XIAO RP2040 is a compact, dual-core ARM Cortex M0+ microcontroller running at 133MHz, featuring 2MB flash and 264KB SRAM. It offers a rich set of interfaces including digital, analog, PWM, I2C, UART, and SPI, supporting Arduino, MicroPython, and CircuitPython. Its ultra-small footprint and compatibility with Seeeduino XIAO expansion boards make it ideal for wearable and small-scale projects demanding high performance and flexibility.

Specifications

ASIN	B09NNVNW7M
Amazon 売れ筋ランキング	パソコン・周辺機器 - 8,106位 ( パソコン・周辺機器の売れ筋ランキングを見る ) シングルボードコンピュータ - 17位
OS1	MicroPython or CircuitPython (or similar embedded operating system)
RAMメモリ採用技術	SRAM
USBポート数	1
おすすめ度	4.5 5つ星のうち4.5 (241) var
コンピュータCPU製造会社	ARM
コンピュータCPU速度	133 MHz
ブランド名	seeed studio
プロセッサ数	2
メーカー名	seeed studio
メーカー型番	500230492
ワイヤレス通信規格	802.11b
互換デバイス	Seeeduino XIAOとその拡張ボード。
内蔵メモリー容量	264 KB
同梱商品	/
品目寸法（L x W x H）	20長さ x 17幅 x 4高さ mm
型番	500230492
最大メモリ容量(GB)	2 MB
通信・接続インターフェース	Uart

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