I'm developing a sensor based on Raspberry Pi 3 and I write the code in Python. To communicate with another peripheral I need to use Serial Port because the other peripheral only has this possibility. To configure the system I'm working with an auxiliar screen and I have established well serial communication. I've follow this tutorial to setup the communications --> https://spellfoundry.com/2016/05/29/con ... ding-pi-3/
But when I unplug the HDMI port I have a lot of interferences in the serial port communications. I try disabling the HDMI output editing /etc/rc.local file and adding /usr/bin/tvservice -o but it doesn't works.
Are there another way to avoid the HDMI interferences?
Thanks for your help!!