Voltage levels of 40-pin GPIO

[lakshan]

Hello @garysims,

When it comes to controlling voltage of GPIO, you can only configure GPIO to either output HIGH or LOW (3.3V and 0V).

This answer can be continued in this discussion:

Echo: write error: Invalid argument

Hi, I am trying to access the GPIO from Linux (Ubuntu 22.04 with kernel 5.15.0-48-generic). I am following the steps from the Wiki: Accessing 40-pin GPIO - Seeed Wiki When I try to write to export I get an error “echo: write error: Invalid argument” sudo -i cd /sys/class/gpio echo 337 > export -bash: echo: write error: Invalid argument Any suggestions? Thanks. Gary.