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StackyPi review: An RP2040 microcontroller compatible with standard HATs

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Reading Time: 2 minutes

Other features include a standard micro-USB port (for 5 V power or connecting to a computer), two tiny push-buttons (including a handy reset), an on-board status LED, and six debug pins.

Plug and play?

That standard 40-pin GPIO header means you can connect any standard Raspberry Pi HAT, pHAT, or other compatible add-on board. The downside is that it’s not a case of plug and play. You will need to adapt any existing software for your HAT to make it work.

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SB Components has adapted software for several of its own HATs for StackyPi, available in a GitHub repo (, which also features a handy GPIO pinout comparison chart – it’s very similar to that on a Raspberry Pi, although some GPIO pin numbers are different.

As with Pico, you need to connect the board via micro-USB to a computer to flash the UF2 firmware and program it – using MicroPython, CircuitPython, or C++.

Why use this over a Raspberry Pi Zero? Well, it does offer far lower power consumption and four ADC channels. Alternatively, you could use a Raspberry Pi Pico with a Red Robotics Pico 2 Pi adapter for standard HATs.



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Not a plug-and-play solution for HATs, as you’ll need to do some software tinkering, but still a neat little Pico-style board with some bonus features.


Connectors: 40-pin GPIO header, 6-pin debug header, micro-USB

Storage: 8MB on-board flash, plus microSD card slot

Features: Boot and reset buttons, status LED, 4 × 12-bit ADC channels, PIO, I2C, SPI, UART

Dimensions: 65 × 30 × 10 mm

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