For a general RP2350 prototype, start with Raspberry Pi Pico 2 if its exposed pins and interfaces match your capture design. Choose a board built around RP2350B when you need more GPIO or ADC inputs than an RP2350A-based design provides—but check the board’s own pinout before committing. Most importantly, identify the video signal, its electrical levels and timing, and the data rate you must sustain before choosing a board. RP2350’s HSTX is for high-speed digital output; it does not make a board an HDMI-input or video-capture device.
What to establish before choosing a board
“RP2350 board” does not specify a single pin configuration or guarantee a complete video-input circuit. The RP2350 is available in A and B package variants, and the board designer determines which chip pins are actually accessible. Meanwhile, “video capture” could mean sampling an analog signal, reading a parallel digital bus, or receiving data through another defined interface. Those jobs can require very different pins, electrical circuitry, and data paths.
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Write down the source requirements first. If any of these are unknown, a board recommendation cannot reliably establish that a particular capture setup will work:
- Signal type: analog voltage, parallel digital bus, or another specified interface.
- Electrical details: signal levels and whether a level-conversion or signal-conditioning stage is needed.
- Timing and workload: bus width, sample rate or pixel clock, resolution, frame rate, and acceptable dropped-frame rate.
- Data destination: how captured data will be buffered and transferred, and the required sustained transfer rate.
- Physical and power constraints: connector, headers, power, mounting, and board routing.
These are design inputs, not specifications that can be inferred from the RP2350 name. Without them, it is not possible to name a suitable input front end or promise a resolution, frame rate, or capture limit. Raspberry Pi’s RP2350 documentation and the specific board’s schematic and pinout are the references to check once those requirements are known.
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It also helps to distinguish the source’s nominal format from the work the board must actually do. A resolution and frame rate describe the intended video, but the implementation also has to acquire each sample, keep up with the source timing, buffer data, and move it onward. The relevant question is not simply whether a chip has enough pins, but whether the complete path is specified for the intended source and destination. No single resolution or frame-rate figure follows from the RP2350 name alone.
If you are comparing candidate boards before settling on a circuit, make a short requirements sheet rather than starting with a shopping list. Include the source interface, signal levels, timing, number of connections, and intended transfer destination. Mark which values are known and which still need to be measured or obtained from the source documentation. This separates board-selection questions, such as exposed pins, from system-design questions, such as input conditioning and sustained throughput.
RP2350A and RP2350B: the pin difference that matters
RP2350A exposes GPIO 0–29, with ADC inputs on GPIO 26–29. RP2350B exposes GPIO 0–47, with ADC inputs on GPIO 40–47. In the official figures, that is 30 GPIO for RP2350A versus 48 for RP2350B, and four ADC inputs versus eight. The added RP2350B pins can matter when a design needs a wider set of digital connections or more ADC-capable inputs.
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| Chip variant | GPIO allocation | ADC-capable GPIO | When it may fit |
|---|---|---|---|
| RP2350A | GPIO 0–29 (30 GPIO) | GPIO 26–29 (4 inputs) | A design whose required pins and analog inputs fit the chosen board’s exposed connections. |
| RP2350B | GPIO 0–47 (48 GPIO) | GPIO 40–47 (8 inputs) | A design that needs additional GPIO or ADC-capable pins, provided the board breaks them out. |
These are chip-level allocations, not a guarantee that every board exposes every pin. A board may not bring out the particular GPIO your bus or circuit needs. Before buying, compare the board pinout with the exact pin assignments and electrical needs of your design; inspect its schematic as well if the routing or connected circuitry matters. Selecting an RP2350B board solely because its chip has more pins is not enough.
The A-versus-B choice is therefore a connectivity decision, not a claim that one variant is inherently a better capture processor. Count the connections your specific interface requires and identify which of them need ADC-capable inputs. Then map those needs to the board-level pinout. The RP2350B’s 48-GPIO allocation and eight ADC inputs may give a design more options, but those added allocations matter only if the board exposes the needed pins and they are free for your use.
For an analog source, do not count every available GPIO as an interchangeable analog input: the documented ADC-capable allocation differs from the general GPIO count. For a digital bus, check the actual GPIO assignments and how many connections the interface and any control signals require. The signal definition determines which pins matter; a larger total count by itself does not answer that question.
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What Raspberry Pi Pico 2 offers as a starting point
Raspberry Pi Pico 2 is a documented RP2350 development board and a reasonable first board for a general prototype when its pinout and interfaces suit the job. Its official product specifications list 520 KB SRAM, 4 MB onboard flash, USB 1.1 host/device support, and 12 PIO state machines. Those are board capabilities; they do not by themselves establish that the board can capture a particular signal or sustain a particular video workload.
The product page listed Pico 2 starting at $5 when crawled in 2026. That is a time-sensitive starting price, not a guarantee of current price or availability, and it says nothing about the additional circuitry a capture design may require.
Use Pico 2 as a baseline only after checking the signal path. Confirm that the board exposes the pins needed by the source interface, that the electrical signal is appropriate for the planned input circuit, and that the full sampling, buffering, and transfer path meets the workload. If the design instead needs pins outside the RP2350A allocation, investigate an RP2350B-based board and verify its actual layout. No particular third-party RP2350B board is established here as a verified choice.
The listed SRAM, flash, and PIO figures are useful specification points when planning a prototype, but they should not be read as a capture-performance result. The SRAM figure is a capacity specification, not a promise that an entire video frame—or any particular number of frames—will fit. Likewise, the flash figure is onboard storage capacity, not proof of a sustained acquisition or output rate. Whether the memory and transfer arrangement is sufficient depends on the workload and the rest of the system.
The same restraint applies to USB. Pico 2’s documented USB 1.1 host/device support tells you the stated USB generation and roles, but it does not establish compatibility with a device that requires USB 3. Check the requirements of the attached device and the board’s documented interface rather than treating “USB” as a generic speed class.
Do not confuse HSTX output with video input
Raspberry Pi describes HSTX as “an HSTX peripheral for high-speed digital output, such as video.” The direction is the key point: HSTX is a transmit/output feature. It does not establish that a board can receive HDMI, sample an arbitrary video source, or capture video at a specified rate. A board’s ability to generate video output is not evidence of a compatible video-input path.
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For input capture, first identify the actual source interface and then determine whether the RP2350 pins, any required external circuitry, memory buffering, and destination connection form a workable path. If the source requires a dedicated capture interface or external converter, the microcontroller board alone is not the whole solution.
This distinction is useful when reading board descriptions and demonstrations. A product or project that mentions “video” may be describing output generation, input capture, or a system that relies on an external device for part of the job. Look for the signal direction and interface in the actual documentation. HSTX’s described role is output; it should not be used as shorthand for HDMI reception or general-purpose capture.
How to compare candidate boards
| Decision axis | What to verify | Why it affects the choice |
|---|---|---|
| Capture signal | Analog voltage, parallel digital bus, or another defined interface; signal levels and timing. | Pin compatibility and any external front end depend on the source. |
| Package and exposed pins | RP2350A or RP2350B, plus the individual board’s pinout and schematic. | The B variant adds GPIO and ADC allocation, but the board may not expose all required pins. |
| Sampling and throughput | Required sample rate, bus width, buffering, and sustained transfer path. | The processor, ADC, memory, and downstream connection all contribute to whether the workload is feasible. No universal capture limit is established. |
| External circuitry | Whether the source needs signal conditioning, level conversion, an ADC, or a dedicated capture interface. | A development board is not automatically a complete video-input circuit. |
| Host connection | Whether the board acts as host or device, and what the attached device requires. | Pico 2 lists USB 1.1 host/device support; that does not mean it has native USB 3 support. |
| Physical integration | Headers, connector, power, mounting, and board-specific routing. | A chip-level feature is useful only if the selected board makes it practical to connect and power the design. |
Do not compare boards by GPIO count alone. A board with more available pins may still be a poor fit if the needed pins are not exposed, the signal requires circuitry you have not accounted for, or the data cannot be moved through the planned transfer path at the necessary sustained rate.
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For a fair comparison, apply the same checklist to each candidate. Record whether it uses RP2350A or RP2350B, whether each required signal has an exposed pin, whether the connector and power arrangement fit, and whether the host/device role matches the attached hardware. If a board’s documentation does not answer one of those questions, treat it as unresolved rather than assuming the feature is present.
A practical selection sequence
- Describe the source. Record whether it is analog or digital, its signal levels, interface, timing, and any known source-side constraints. “Video” by itself is not a usable electrical specification.
- Set the capture target. Specify resolution, frame rate, sampling or pixel rate, bus width, and tolerated data loss. These requirements determine what must be evaluated; they should not be guessed from the board model.
- Map connections to a real pinout. Check whether the candidate board exposes the exact GPIO or ADC inputs needed. If an RP2350A allocation is insufficient, look at RP2350B-based boards, then verify their schematic and pinout rather than assuming all additional pins are broken out.
- Account for the input electronics. Determine whether the source needs signal conditioning, level conversion, an external ADC, or a dedicated capture interface. Choose those parts only against the source’s stated electrical and timing requirements.
- Check the whole data path. Work through sampling, buffering, memory, and transfer to the destination. A suitable pin count does not prove that the complete path can sustain the required workload.
- Confirm host and physical requirements. Check whether a connected device needs host capability, what its interface requires, and whether the board’s connector, power, headers, and mounting work for the build.
- Choose the simplest board that meets those requirements. Use Pico 2 for a general prototype when its interfaces and pins fit. Choose an RP2350B board when the extra allocations are needed and the board actually exposes them.
A useful buying checkpoint comes between mapping the design and placing an order: confirm every required connection against the board’s own documentation. For an RP2350B candidate, specifically verify whether the additional GPIO and ADC-capable pins are brought out. For Pico 2, verify that the available RP2350A allocations match the planned interface. Also check whether the board’s stated USB role, physical connector, power arrangement, headers, and mounting suit the rest of the build.
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If the source or transfer requirements are not yet known, the next step is not choosing a larger board “just in case.” First obtain or measure the source’s electrical and timing details and define the data destination. A more expansive pin allocation cannot resolve an unknown signal level, missing input interface, or untested sustained data path.
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The hsdaoh-rp2350 project report describes an RP2350B used with USB 3 HDMI capture sticks for high-speed data acquisition. Treat that as an example of a particular system involving external hardware—not proof that RP2350 boards generally support HDMI input, that Pico 2 has native USB 3, or that a given resolution or frame rate will work. The report does not establish a universal performance guarantee for other boards or capture devices.
If considering a similar arrangement, verify the requirements and capabilities of the exact board, capture device, host connection, and software path. Do not select a board based on the words “USB 3 HDMI capture” alone; the project example is not a substitute for confirming that the particular hardware combination supports the intended workload.
This example is best treated as a lead to investigate a specific combination, not as a category-wide recommendation. It does not make all USB 3 capture sticks interchangeable, nor does it change the USB specification listed for Pico 2. Confirm the exact board and capture hardware documentation, the connection and host requirements, and the intended workload before drawing a conclusion from a project report.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common selection mistakes and how to avoid them
- Assuming HSTX means HDMI capture: HSTX is documented as high-speed digital output. Identify and validate a separate input path for capture.
- Assuming RP2350B guarantees access to GPIO 30–47: The chip has those GPIO allocations, but board layouts vary. Check the actual pinout before assigning the design.
- Choosing based on “video” without a signal specification: Analog and digital sources can require different interfaces and front ends. Establish signal type, levels, and timing first.
- Treating USB 1.1 host/device support as USB 3 capability: Pico 2’s stated USB support is USB 1.1. An external project involving USB 3 capture hardware does not change that board specification.
- Assuming memory or pin counts prove a capture rate: Pico 2’s 520 KB SRAM, flash capacity, GPIO, and PIO count do not establish an end-to-end resolution, frame rate, or dropped-frame rate. Evaluate the actual acquisition and transfer path.
- Buying an external ADC or capture accessory before defining the source: Match any front end to the signal’s voltage, interface, and timing instead of treating an accessory as universally suitable.
- Assuming a chip feature is a board feature: Package-level pin allocations do not confirm that a particular board routes those pins to accessible connections. Check the board’s pinout and schematic.
- Using a starting price as a system budget: Pico 2 was listed from $5 on the product page when crawled in 2026, but a capture build may also need external circuitry and other hardware. The listed board price is not a complete-project cost estimate.
Which board should you start with?
Start with Pico 2 for an RP2350 prototype when the capture design fits its exposed pins and interfaces, and treat it as one component in a signal-specific system. Move to an RP2350B-based board when your pin or ADC needs exceed the RP2350A allocation, after confirming that the chosen board exposes the connections required. If you have not yet specified the source signal and required data rate, make that specification the next step: no board choice alone can settle whether the complete capture system will work.
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- Latest Version: Higher core clock speed, double memory, more powerful Arm cores, optional RISC-V cores (compared to the 1 series)
- Switchable Cores: Allows users to choose between dual industry-standard Arm Cortex-M33 cores and dual open-hardware Hazard3 cores
- Compatibility: Delivers a significant performance boost, while retaining software- and hardware-compatible with the 1 series
- Detailed Tutorial: Provides step-by-step guide with MicroPython, C and Processing (Java) Code (The download link can be found on the product box) (No paper tutorial)
- Example Projects: Each project has schematics, wiring diagrams, complete code and detailed explanations (Need extra items)
Frequently Asked Questions
Can Raspberry Pi Pico 2 capture HDMI video directly?
Its HSTX peripheral is described as high-speed digital output, such as video; that does not provide HDMI input. Pico 2’s product specifications list USB 1.1 host/device support, not native USB 3. A separate, suitable capture path and external hardware would need to be evaluated for the specific source.
What is the practical difference between RP2350A and RP2350B for a capture design?
RP2350A has GPIO 0–29 and ADC inputs on GPIO 26–29: 30 GPIO and four ADC inputs. RP2350B has GPIO 0–47 and ADC inputs on GPIO 40–47: 48 GPIO and eight ADC inputs. Those are chip allocations. Check whether the individual board exposes the pins your design needs.
Is Pico 2 a good board for video capture?
It is a reasonable general RP2350 prototype when its exposed pins and interfaces fit the design. Its 520 KB SRAM, 4 MB flash, USB 1.1 host/device support, and 12 PIO state machines are board specifications, not proof of a particular capture rate. Define the source signal, timing, and transfer requirements first.
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How much does Pico 2 cost?
Raspberry Pi’s product page listed Pico 2 starting at $5 when crawled in 2026. Price and availability can change, and that board price does not include any external circuitry or other hardware a capture design may need.
Can an RP2350B board work with a USB 3 HDMI capture stick?
A project report describes an RP2350B used with USB 3 HDMI capture sticks for high-speed data acquisition. It is an example of a specific external-hardware setup, not a general compatibility guarantee or evidence of native USB 3 on Pico 2. Verify the exact board, capture device, host connection, software path, and workload.
What should I specify before buying an RP2350 board for capture?
Identify whether the source is analog, a parallel digital bus, or another defined interface; document signal levels and timing; set the required sample or pixel rate, bus width, resolution, frame rate, and tolerated data loss; and determine how data will be buffered and transferred. Then match those requirements to board-level pinout, circuitry, host role, power, and physical connections.
The Bottom Line
Choose from the signal outward: define the source, levels, timing, and sustained data path, then check the individual board’s pinout and interfaces. Pico 2 is a sensible general RP2350 starting point when its exposed connections fit; RP2350B is relevant when its additional GPIO or ADC inputs are needed and actually broken out. HSTX is output, not proof of HDMI capture.
Quick Recap
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