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The PrawnBlaster firmware turns the $5 Raspberry Pi Pico microcontroller board into a [_labscript suite_](https://github.com/labscript-suite) pseudoclock device.
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**Current Development Status**: Beta. The firmware has not been well tested. There may be timing errors, errors that appear when running for long periods of time, and/or missing or undocumented features. **There is currently no labscript device class.**
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## What is a pseudoclock device?
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A pseudoclock is a device that can be programmed to output a variable frequency clock.
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The entire sequence of clock pulses is programmed into internal memory (over serial) and then executed on command (in order to achieve precise timing).
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Without pin 20 or 22, you can't externally reference the board.
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And with less GPIO pins you can't have 4 independent pseudoclocks each with an independent trigger.
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If you only need 1 trigger, you can get away with 1 pin for a trigger, 1 pin for each pseudoclock output you want (somewhere between 1 and 4) and 1 pin (either GPIO 20 or 22) for externally referencing if you need it.
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But unless you have a strong reason to get another RP2040 based board, we suggest sticking with the standard Pico (Which is usually the cheaper option anyway).
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But unless you have a strong reason to get another RP2040 based board, we suggest sticking with the standard Pico (Which is usually the cheaper option anyway).

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