Problem solved.
I use Linux and DietPi on a Raspberry Pi 3.
Guide for inexperience users like me.
You have to edit the /etc/grafana/grafana.ini using the command: nano /etc/grafana/grafana.ini
Then you have to look for the [dashboards] section and ADD a new line with: min_refresh_interval = 1s
You can use 1s or 100ms and other values.
Thanks all the helped me on the topic.
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