Chart data have strange "regular" difference


I am using Cayenne in different projects on different boards and quite happy - works well. When downloading photocell data from chart, I found strange, very regular (every day at 2,00 am) difference in data, when value for that specific hour drops about 50%:

any idea?

Bad data in the chart

I have the same issue with cheap DHT11 sensor. Maybe it is from the sensor? How do you wire it? Do use resistor for that photo-resistor ?


Are you using a Pi or Arduino?


Arduino (NodeMCU)


I am using onboard photocell:


The only suggestion I have is hook up the Arduino to a computer and let it run with the serial monitor open to see what is happening at 2:00


Hello @adam, this is good suggestion! I will try with mine cheap DHT11 as well :slight_smile: