Cheap logic analyzer SPI i2c UART

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Huge LED matrix with scrooling text. In the next video we will connect a bluetooth module to it and send text with out smartphone. All the links are below.
Help my projects on Patreon :
my Q&A page:
COUPONS
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Buy logic analyzer (12$):
Digital 2-channel Oscilloscope:
PRINTERS
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Anet A8 (19% discount):
Creality CR10 mini:
Coupon: "cr10mini3d"
TEVO Tornado (US):
Coupon: "Tornadous1"
Creality CR10 (EU):
Coupon: "cr10jk1"
LINKS
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Download LOGIC software:
Download the Text send App:
Create the App video:
SCHEMATICS
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SPI simulation:
UART simulation:
i2c simulation:
CODE
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i2c test sketch:
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