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, 3pcs.

Seeed Studio XIAO RP2040 Microcontroller with Dual-Core ARM Cortex M0+ Processor, Supports Arduino, MicroPython and CircuitPython with Rich Interfaces, 3pcs.

Product ID: 448645529

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Details

Brand
Seeed Studio
Model name
RP2040
Installed RAM memory size
264 KB
Memory storage capacity
2 MB
CPU model
Core M Family

⚡Dual-core 133MHz ARM Cortex M0+

💾2MB onboard Flash + 264KB SRAM

🔌11 digital + 4 analog + multi-interface pins

Description

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

AMPLE MEMORY STORAGE - 2MB Flash and 264KB SRAM ensure your complex projects and code libraries run smoothly without compromise.
VERSATILE CONNECTIVITY - Packed with 11 digital, 4 analog, PWM pins plus I2C, UART, SPI interfaces for limitless hardware integration.
BLAZING FAST PROCESSING - Harness the power of dual-core ARM Cortex M0+ running at 133MHz for seamless multitasking and rapid execution.
CROSS PLATFORM COMPATIBILITY - Supports Arduino, MicroPython, and CircuitPython—empowering you to code your way with broad ecosystem support.
COMPACT BREADBOARD FRIENDLY - Ultra-small 20x17.5mm footprint fits perfectly in wearable tech and tight spaces, with no back components for easy prototyping.

The Seeed Studio XIAO RP2040 is a compact microcontroller featuring a dual-core ARM Cortex M0+ processor running at 133MHz, equipped with 2MB Flash and 264KB SRAM. It offers extensive I/O options including digital, analog, PWM pins, and multiple communication interfaces. Compatible with Arduino, MicroPython, and CircuitPython, its small size and breadboard-friendly design make it ideal for wearable devices and compact projects.

Specifications

Processor	133 MHz core_m_family
RAM	SRAM
Wireless Type	802.11b
Brand	seeed studio
Series	RP2040
Operating System	Arduino, MicroPython, CircuitPython
Item Weight	0.317 ounces
Package Dimensions	4.45 x 1.69 x 0.47 inches
Processor Brand	Broadcom
Number of Processors	2
Manufacturer	seeed studio
ASIN	B09XTCXJKW
Date First Available	April 13, 2022

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