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, Compatible with Arduino, MicroPython, CircuitPython, Supports Numerous Interfaces

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

Product ID: 729398108

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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129 kr

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Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Power-packed microcontroller that fits in your palm—build smarter, faster, cooler.

COMPACT YET EXPANDABLE - Small enough for wearables and tight spaces, yet fully compatible with Seeeduino XIAO expansion boards to scale your innovation.
PLUG PLAY COMPATIBILITY - Seamlessly works with Arduino, MicroPython, and CircuitPython—perfect for pros who demand flexibility.
MEMORY THAT MEANS BUSINESS - 2MB onboard flash paired with 264KB SRAM offers ample space for complex code and smooth multitasking.
INTERFACE HEAVEN FOR MAKERS - 11 digital pins, 4 analog pins, plus UART, SPI, and I2C interfaces give you endless connectivity options.
POWERHOUSE PERFORMANCE IN A THUMB SIZED PACKAGE - Dual-core ARM Cortex M0+ processor running at a lightning-fast 133MHz ensures your projects never lag behind.

The Seeed Studio XIAO RP2040 is a compact microcontroller featuring a dual-core ARM Cortex M0+ processor clocked at 133MHz, 2MB flash memory, and 264KB SRAM. It supports multiple interfaces including digital, analog, UART, SPI, and I2C, and is compatible with Arduino, MicroPython, and CircuitPython. Designed for wearable and small-scale projects, it offers breadboard-friendly, SMD design with full compatibility for Seeeduino XIAO expansion boards, making it a versatile choice for professional developers and makers alike.

Specifications

ASIN	B09NNVNW7M
Amazon Bestseller	#14,246 in Computers ( See Top 100 in Computers ) #43 in Single Board Computers
Brand	seeed studio
Built-In Media	/
Compatible Devices	Seeeduino XIAO and its expansion board
Connectivity Technology	Uart
Customer Reviews	4.5 4.5 out of 5 stars (237)
Item Dimensions L x W x H	20L x 17W x 4H mm
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
Wireless Compability	802.11b

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