Minty Fresh Breakout PCB!

A project log for VISP - Ventilator Inline Sensor Package

Bidirectional flow (volume), pressure, and temperature sensing in a single inexpensive I2C/SPI package.

Steven.CarrSteven.Carr 04/05/2020 at 06:101 Comment

Even though I ordered "Super Swift" boards from @oshpark, they are going to take a while to get here, and we have questions we need to answer, now.

The barometric sensors we chose have pads that are simply far too small to air-wire them, without a microscope at least.  These pads make 0402 components look huge.

I am going to have to etch a board.

I have some Blue Press-N-Peel PCB toner transfer paper from a project I did about 10 years ago (maybe longer).   Three sheets left, I m going to have to make each one count.  

  Even though these sheets are old, they worked like a champ!

Normally I would use some Muriatic Acid and Hydrogen Peroxide to mix up a batch of Cupric Chloride.  Problem is I'm all out of Hydrogen Peroxide.  Off to the store.

Every store, every shelf, empty.  Anything remotely related to disinfection.  Gone.  
I live in southern NJ.  Out here, things like Alcohol, Hydrogen Peroxide, and toilet paper seem to be really hard to come by right now.

I am going to have to get creative.  

What else uses peroxide...  Hair dye... maybe.   Teeth whitening!  Off to the oral care aisle to scour the shelves for a product containing what looks to be good amount of my essential raw ingredient.  Mouthwash with teeth whitening has Hydrogen Peroxide, Score!

I have no idea how much the concentration is, so I am going to have to wing it here.  
Equal parts mouthwash and Distilled Vinegar seasoned with a large pinch of salt.  Mmmm.

It's working, it's WORKING!

Results will vary, but here are my minty fresh BMP breakout boards!.


Daren Schwenke wrote 04/05/2020 at 15:47 point

That is glorious.  You, sir, are a hacker.

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