● 17 min readShowdown: Uno R4 vs Uno R3 vs Nano
Welcome to Vol. 12 of The Probots Showdown. Three boards. Three price points. Three very different futures for your project.Should you stick with the
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The smallest RP2040 board on the market. Featuring 29 GPIO pins, USB Type-C, and pre-soldered headers, it's the ultimate high-performance microcontroller for space-constrained DIY and R&D projects.
The RP2040-Zero is the ultimate "small-but-mighty" microcontroller. It takes the full feature set of the Raspberry Pi RP2040 silicon—including the dual-core processor and flexible PIO—and shrinks it down to a footprint barely larger than a postage stamp. Best of all, this version comes with pre-soldered headers, meaning you can take it straight from the box and plug it into your breadboard or female headers without ever touching a soldering iron.
Small boards often suffer from thermal issues or fragile connectors. To ensure project longevity, the RP2040-Zero is Probots™ Lab Verified, having undergone thermal stress testing in our Bangalore facility to ensure the high-density components operate reliably even under full CPU load. Because we know that navigating mini-boards can be tricky, our Probots™ Tech-Bridge provides you with verified pinout diagrams and library links right here on the page, so you spend less time searching and more time building.
Microcontroller: Dual-core ARM Cortex M0+ @ 133MHz
Memory: 264KB On-chip SRAM
Flash: 2MB QSPI Flash
USB Interface: USB Type-C (Power, Data, and Programming)
Form Factor: Ultra-compact (approx 23.5 x 18mm)
GPIO: 29x Multi-function GPIO pins (20 pins on headers, 9 pins via pads)
Peripherals: * 2x SPI, 2x I2C, 2x UART
4x 12-bit ADC
16x Controllable PWM channels
On-board LED: WS2812 RGB LED (Connected to GPIO16)
Mounting: Breadboard-friendly with pre-soldered headers.
Wearable Tech: Small enough to be sewn into clothing or hidden in 3D-printed props.
Custom Keyboards: Use it as a powerful controller for split mechanical keyboards or macro pads.
Drone Flight Controllers: Its high clock speed and small size make it perfect for custom mini-quad projects.
USB Security Keys: Build your own 2FA or HID injection tools with modern Type-C connectivity.
Past Projects (Prerequisites): If you've used a standard Raspberry Pi Pico or an Arduino Nano but found them too bulky for your enclosure, this is your upgrade.
Feature Upgrade: The RP2040-Zero provides the same 264KB SRAM as the Pico but in a 60% smaller volume, unlocking the ability to put high-performance logic in tiny spaces.
Effort Level: Intermediate. While the software is easy (Pico-compatible), the high pin density requires careful wiring.
Hardware Needed: A USB Type-C data cable and a breadboard or female header strips.
Voltage Warning: The RP2040 is NOT 5V tolerant. All I/O pins operate at 3.3V only.
Probots™ Logic-Safe Pro-Tip: If interfacing with 5V components like traditional ultrasonic sensors, use a logic level converter to protect the RP2040.
Resetting: Since there is no physical reset button on many mini-boards, we've broken out the 'Run' pin so you can add an external reset switch easily.
RGB LED: Address GPIO16 using the NeoPixel library to control the onboard RGB status indicator.
Included: 1x RP2040-Zero Board with Pre-Soldered Header Pins.
Required Additional: USB Type-C Data Cable, Breadboard for prototyping.


Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We delivery electronics components and parts throughout India using standard couriers like Bluedart, Delhivery & India Post.
For order related queries contact -
Probots sells every Electronics Part for your next Project. You can order 10,000+ Electronic Parts Online - Arduino, Raspberry Pi, NodeMCU Development Boards, Sensors, Motors, Motor Drivers, SMPS, Plastic Enclosures etc in India directly on probots.co.in
We offer specialized services for Bulk, Wholesale & B2B Customers like discounted prices, additional shipping options, customised products, etc . Customer with large quantity & regular orders qualify for the specialised discounted rates.
We also offer dedicated sales team to assist you with the order process by providing sales quotations, PI, technical support for choosing products, etc.
Note: Business Orders are processed manually and usually take 1-3 days to process compared to placing the order directly on our website. Please plan your purchases accordingly.
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Probots Electronics is highly regarded for its great selection of components and professional service. Customers frequently praise the awesome care and timely delivery provided by the team to ensure all products arrive safely.
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