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 Microcontroller, with Dual-Core ARM Cortex M0+ Processor, Supports Arduino, MicroPython and CircuitPython with Rich Interfaces.

Seeed Studio XIAO RP2040 Microcontroller, with Dual-Core ARM Cortex M0+ Processor, Supports Arduino, MicroPython and CircuitPython with Rich Interfaces.

Product ID: 395901707

Details

Brand
seeed studio
CPU Speed
133 MHz
Memory Storage Capacity
2 MB
Model Name
XIAO RP2040
Ram Memory Installed Size
264 KB

⚡Dual-core ARM Cortex M0+ @133MHz

💾2MB onboard Flash + 264KB SRAM

🔌11 digital + 4 analog + multi-interface pins

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Description

🚀 Tiny Board, Massive Possibilities – Code Your Future Now!

INTERFACE HEAVEN - 11 digital, 4 analog, PWM, I2C, UART, SPI – all the connectivity you need in one compact board.
POCKET SIZED POWERHOUSE - At just 20x17.5mm, it fits anywhere – perfect for wearables and sleek, space-conscious designs.
PLUG PLAY COMPATIBILITY - Seamlessly supports Arduino, MicroPython, CircuitPython, and Seeeduino XIAO expansions for ultimate flexibility.
MEMORY THAT MEANS BUSINESS - 2MB Flash and 264KB SRAM to store and run your most ambitious projects effortlessly.
BLAZING DUAL CORE PERFORMANCE - Harness the power of a 133MHz ARM Cortex M0+ for lightning-fast multitasking.

The Seeed Studio XIAO RP2040 is a compact yet powerful microcontroller featuring a dual-core ARM Cortex M0+ processor running at 133MHz, equipped with 2MB Flash and 264KB SRAM. It offers a rich set of interfaces including digital, analog, PWM, I2C, UART, and SPI pins, making it ideal for versatile embedded projects. Compatible with Arduino, MicroPython, and CircuitPython, its ultra-small form factor (20x17.5mm) is perfect for wearable tech and space-constrained applications, while maintaining broad compatibility with Seeeduino XIAO expansion boards.

Specifications

ASIN	B09NNVNW7M
Best Sellers Rank	#60 in Single Board Computers (Computers & Accessories)
Brand	seeed studio
Built-In Media	/
Compatible Devices	Seeeduino XIAO and its Expansion Board
Connectivity Technology	I2C
Customer Reviews	4.6 4.6 out of 5 stars (195)
Item Dimensions L x W x H	0.79"L x 0.67"W x 0.14"H
Manufacturer	seeed studio
Memory Storage Capacity	2 MB
Mfr Part Number	500230492
Model Name	XIAO RP2040
Model Number	500230492
Operating System	MicroPython or CircuitPython (or similar embedded operating system)
Processor Brand	ARM
Processor Count	2
Processor Speed	133 MHz
RAM Memory Installed	264 KB
RAM Memory Technology	SRAM
Total Usb Ports	1
Warranty Description	/
Wireless Compability	802.11b

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