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by Finn2708
Fri Jul 03, 2020 10:41 am
Forum: Device Tree
Topic: Pi-4 Activating additional UART ports
Replies: 78
Views: 35024

Re: Pi-4 Activating additional UART ports

Adding any of dtoverlay=uart2 dtoverlay=uart3 dtoverlay=uart4 dtoverlay=uart5 to /boot/firmware/usercfg.txt on a Pi 4b running Ubuntu 20.04 leads to a rainbow splashscreen on reboot, even though there are uart*.dtbo files in /boot/firmware/overlays. Resetting usercfg.txt with a secondary linux machi...
by Finn2708
Mon Jun 29, 2020 7:52 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using Optoisolators at 115200 baudrate
Replies: 4
Views: 269

Using Optoisolators at 115200 baudrate

Hi, I would like to interface my 3D printer control board (5V) with my Pi 3 (3.3V) running octoprint. For this I need a serial connection capable of 115200 baud while isolating the Pi from the board at the same time. For this, optoisolators are the component to use, I think. I tried it with a couple...

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