Custom Footprints

A project log for D1 Mini Matrix Deluxe Shields

Shields for the D1 Mini ESP8266 board using the ISSI chips

deʃhipudeʃhipu 04/14/2017 at 22:303 Comments

I made the trip to the hackerspace and used their hot air gun, and desoldered/resoldered the chip properly. I can now confirm that the resistors that I removed from the example schematic in the datasheet when designing that version of the PCB were in fact necessary for the chip to function. Who would have thought! Oh well, I just need to wait for the other version of the PCB, with all the resistors, to arrive.

In other news, I also received the PCB for the 7x11 matrix and the IS31FL3736 chip. Unfortunately, there is a small problem with the QFN footprint that I used (instead of making a custom one based on the datasheet):

Turns out that just taking a 36-pin QFN footprint and adding the pins to make it a 40-pin QFN footprint is not enough -- you also have to scale it down. I have now corrected all my QFN footprints for those chips to be exactly like in the datasheets, and re-did the PCBs. Of course it's another couple of weeks until they arrive...


davedarko wrote 04/15/2017 at 07:36 point

still a bit confused with the matrices I've send you. They should work with the HT16K33, but just not with your HT16K33 shield, right?

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deʃhipu wrote 04/15/2017 at 09:03 point

Yes, I need to design a different PCB for them. However, I was hoping to get them to work with the IS31FL3736, because then you get brightness and breathing control of every pixel individually, which is kinda cool.

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davedarko wrote 04/15/2017 at 10:40 point

I'm finalizing a design as well :)

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