FFT plot: plot arrays in JSON

Dear Dimitris,

you might want to have a look at what we are doing over at Hiveeyes.
TLDR; We are using InfluxDB and Grafana Heatmap.

With kind regards,
Andreas.

P.S.: After posting this, I recognized that I actually answered on FFT PLOT (fast fourier transformed) on grafana - influxdB already referencing the same links.