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I/O Pin Testing & Observing

Paul StoffregenPaul Stoffregen
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  • Paul StoffregenPaul Stoffregen

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This project was created on 02/18/2014 and last updated 5 years ago.

Description

I do a lot of testing on Arduino libraries and sketches. Being able to quickly observe and fiddle with ALL the pins makes this much easier.

I wanted a board that shows the state of all I/O pins on LEDs with all of these properties....

Works for Digital Input, Output, and Input Pullup

Pushbutton to drive the pin high, very weak pulldown (much weaker than on-chip pullup)

Works for analog pins (thumbwheel pot), but also works when the same pin is used for digital

LED shows actual analog level - LED current should be linear to actual voltage

LED current does not interfere with analog voltage

LED does not interfere with weak signals, or input pullup or pulldown

Inexpensive - under $0.50 per pin - many parts are ok, as long as they're cheap!

More details on my DorkbotPDX project blog...

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  • PCB Files & Placement Diagram

    Paul Stoffregen • 02/25/2014 at 20:30 • 0 comments

    ​I've added the PCB gerber files and placement diagram for the latest version of this board, on this project's blog page at DorkbotPDX.org

    http://www.dorkbotpdx.org/blog/paul/input_output_a...

    I would post them here too, if this site had a way to attach the files...

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