Chart data have strange "regular" difference


#1

Hi,
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
#2

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 ?


#3

Are you using a Pi or Arduino?


#4

Arduino (NodeMCU)


#5

I am using onboard photocell:


#6

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


#7

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