i noticed that several SDS011 sensors send zeroed values from time to time…
any known solution ?
Hi,
It is no 0 values.
Oxidation or contact issue.
Oxidation or contact issue where ?
i started building these at mid January 
Even with newly built sensors you should expect the occasional measurement failure. The number of SDS011 errors is reported on the status page. You can compare that number to the uptime or number of measurements. Once every few hours is not uncommon.
thank you, so its not a bug, its an option…
Check all the connections between esp and sds011.
I’ve been running one sensor (SDS011/BME280) for more than 5 years now and have been collecting all the statistics from the status page. Below is a graph of the reported number of SDS011 errors as a percentage of the number of measurements since the last reset.
I regularly clean the connections and if needed replace the cables. As you can see there have been SDS011 errors since the start of collecting the data and the error rate is relatively constant. I haven’t investigated possible correlations with other factors but wiring can be safely excluded in my case.
Since I noticed an increase a few months ago I bought a new SDS011 and use that as an indoor sensor (similar board, also a BME280). It shows a similar error rate:
Note the drop the last few days. The only thing that changed there was a change of power supply. So a better power supply might help but there will still be errors.
I do think somehow that there still is some timing issue in the firmware and I seem to remember that Dirk did some research on that a long time ago. For me the failure rate is acceptable.
right now we use cables.
do you think it would be better to use a pcb and plug everything on it ?
Maybe it’s the result of already known issue with sleep mode of SDS011:
I have never seen this behavior, only errors on status.
We use PCB and add 2 type off capacitors for spikes and noise on the power (close to the connector as possible)
We have build more than 140 x SDS011 sensors
And what is the error rate on the menu-status?
My SDS011 sensor has 19 errors from 1300 measurements (1.5%)
well, every day at 00:00:00, i run a script which searches for records with null values the last 24 hours.
then, it imports the results into a table.
and this page, displays the table data…
you can select all or a specific sensor, and last day, last week, last month, from the beginning…
i erased everything from the table and we will check tonight at midnight
Have you checked the voltage (power requirement SDS011)
I have seen low voltage with some USB adapter and Long cable
What is the differences between the high and low error rate sensor?
take a look at this… it has only data from 2 days, but time is on our side…