ETMoody3
Member

Yeah, I'm seeing exactly what Defragster is describing. Looks like the error may only be on the flex cable?

Received, much thanks. Ordering extra T4 boards Friday. Will likely wait until detailed instructions are available so as to test those as well. I do have a usb microscope.

attached T4 previously flashed with "Keyboard Simple" sketch to windows 10 notebook computer. It rebooted, and failed to acknowledge the built in keyboard. Another reboot corrected this. A second attempt to...

Installed on linux mint 19.2 Tina, XFCE desktop, Arduino 1.8.10 USB Midi example " InputRead " works as expected. USB Keyboard example "Simple"... "all hell" breaks loose. Random applications launched, ' Start...

The library examples compile for me for all 32 bit Teensy boards. You should know in advance that it is relatively easy to destroy these units by setting the gain too high or ... uhm... feeding the card reverse...

Im interested. I just obtained reflow soldering equipment, looks like good practice. Thanks in advance

^ This is why I don't say much here.

That circuit was copied from the sim800L datasheet ( cellphone chip) and is definitely an extreme measure... but it works. I also use MG Chemicals' 841AR nickel conductive shield paint to good result for blocking...

Try the usual decoupling capacitor voodoo, large ground plane, diodes.. Noise killing appears to me to be more alchemy than science. This is from a cellphone project, the frequencies you're encountering may...