Postgres Time series

Hi. I have a very simple postgres DB colletion sensor data on timestamps.

When I create a time series in grafana there is no graph, but the min max values work. Additionally if I change the graph to a bar it can show the latest entries but I need to display it as a time series.

I am very new to this. So it maybe be a stupid question.

My DB setup

Grafana graph and query.

I want the adc4, adc5 and adc6 data to be graphed on the same axes over time

Does your query return NULL values aswell. Maybe those prevent the line drawing. There is an option to display the data points and you can control whether NULL values should be ignored when drawing lines.