Use a max98357 and an SPI screen at the same time?

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Yoyolick
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Use a max98357 and an SPI screen at the same time?

Post by Yoyolick » Mon May 13, 2019 3:56 pm

Im trying to use a max98357 for audio and this screen (https://ebay.to/2YsuX2t) at the same time but it looks like certain pins overlap. I have no idea how to use both at the same time and cant seem to find anything online... help?


also first post :D

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VeteranGamer
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Re: Use a max98357 and an SPI screen at the same time?

Post by VeteranGamer » Mon May 13, 2019 4:29 pm

Yoyolick wrote:
Mon May 13, 2019 3:56 pm
Im trying to use a max98357 for audio and this screen (https://ebay.to/2YsuX2t) at the same time but it looks like certain pins overlap. I have no idea how to use both at the same time and cant seem to find anything online... help?


also first post :D
Welcome....

the only GPIO that might overlap is for the back light (LED)
if using this method (or similar) to enable the SPI LCD


https://www.sudomod.com/forum/viewtopic.php?f=22&t=2312


you might be able to use another GPIO .....
but another alternative is to wire the back light (LED) to the 3.3V....
this can easily be done with the aid of a resistor (around 3.9ohm)

https://www.sudomod.com/forum/viewtopic ... 753#p73753


again....
you may be able to use another GPIO instead (someone else may be able to confirm/clarify this)
but wiring to the 3.3v is a quick work around





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Yoyolick
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Re: Use a max98357 and an SPI screen at the same time?

Post by Yoyolick » Mon May 13, 2019 4:49 pm

you might be able to use another GPIO .....
but another alternative is to wire the back light (LED) to the 3.3V....
this can easily be done with the aid of a resistor (around 3.9ohm)
sounds like someone in discord said just bridge the backlight pin with the vcc pin? screen is 3.3v so i shouldnt need a resistor? thanks again veteran :D

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Picicle
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Re: Use a max98357 and an SPI screen at the same time?

Post by Picicle » Tue May 14, 2019 1:05 am

About max98357: https://learn.adafruit.com/adafruit-max ... p/overview
Resistor can be from 3 to 20 ohm if Vin is 3.3V

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