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A project log for D1 Mini Expander Shield

Add 16 extra GPIO pins to your ESP8266.

dehipudeʃhipu 03/08/2019 at 17:366 Comments

I feel like this could actually be sold on Tindie, so I added this board to an order I was making anyways. The boards arrived this week, and today I decided it's time to play a bit of a sweat shop and assemble a couple of them. However, this is the only MCP23017 chip I could find in my drawer:

I think it may be the wrong footprint for it...

Discussions

David Boucher wrote 03/08/2019 at 20:56 point

Nice. Am I right in thinking that you plan to sell these populated?

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deʃhipu wrote 03/08/2019 at 21:15 point

Yes, of course, that's the whole point of a ready to use module. I assume that people who can solder such chips are perfectly capable of making their own breakouts and figuring out the connections without needing a ready shield (though again, they still might go for the convenience of having an already designed and soldered up module).

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Dave's Dev Lab wrote 03/09/2019 at 04:09 point

that'd be a good board to run on my pnp, let me know if you are interested in doing something...

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deʃhipu wrote 03/09/2019 at 09:12 point

The logistics for that would be a bit tricky. I could send you a couple of boards to try, but it will be cheaper if you just order them yourself (free shipping). Same for the parts. I attached the gerber files to the project, if you would like to try. The resistors are 10kΩ, and the capacitor is anything between 0.5 and 4µF.

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Dave's Dev Lab wrote 03/11/2019 at 17:18 point

what are you licensing it under?

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deʃhipu wrote 03/11/2019 at 18:41 point

Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)

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