Have a look at the Tasmota console at the time of the spikes, maybe you’ll find something useful there.
My best guess based on the pattern is that you have some sort of interference going on. Looks like something which triggers every 1.5h during the day & slightly less frequently at night.
I did setup a rsyslog server specificly for this in an attempt to debug the problem.
The logging on the Tasmota devices are set to “4 More debug”.
I checked and compared the logs for both the temp and the switch devices and I couldn’t see anything that would suggest a device failure. Yes I do have multiple temp devices and all device show the same results.
I have a Deco XE75 wifi6 wireless and I checked the wifi optimization and it changed the wifi channels for me as it claimed some interference. So i’ll sit back and monitor the system for the rest of the day to check for spikes.
The wireless in my immediate area is somewhat congested and I may need to look at an alternative network method for my IoT devices in an attempt to resolve this.
The only time the temp is changed is when the lights are ON/OFF, ON temp is 24 and OFF temp is 22. Else the temp during those cycles has a hysteresis of 0.6
This sort of control is ideal in a grow room as it means you have control over the desired outcome. And the concept behind having a grow room is to have total control over the environment your growing in.
What you are suggesting would be entirely correct in a typical outdoor grow tunnel as you have very limited control. But the coutcome can be quite variable/inconsistent.
Just a standard 2Kw wall heater with the temp set to 26 so it turns off if the heater relay fuses.
Sensors are DS18B20s contected to an ESP8266EX. I have some SHT45s arriving as the DS18B20s are inherently inconsistent in their readings.
Hysteresis is taken care of in 2 ways. Firstly the setpoint is only 0.1 and the rest is good airflow. There are no dead spots in my growroom.
But my grow room is small at only 2.4 cubic meters (2.4x2.4x2.4).
Now I know there are going to be those out there that will say my setpoint should never be that low. At the end of the day it is working for me, and thats what counts.
As for the spikes I’m experiencing. I’ve changed everything including the WIFI device the IoT devices are connected to. No change. So I have ordered a complete Zigbee setup. My intention is to put in a Sonoff ZBDongle E and change all the sensor boards to ESP32-C6 SuperMini modules with Tasmota Zigbee firmware in the hope that that will resolve the issue.
I do have a chiller for aquariums for the water in the DWC as this needs to be about 19°C to help prevent root problems and to increase nutrient uptake.
I have checked the logs and the times the chiller turns on/off don’t coincide with the room spikes.
I also have several 40CM high velosity fans and the AC Infinity extractor fan. these fans run permanently so I wouldn’t expect them to create spikes.
And obviously the LED lights that are either on or off depending on the grow cycle.
Heater relay control is done via a SONOFF 4CH PRO R3 mounted in the switchboard. The relays can’t switch much current, so I had 4 20A relays installed, and the board drives those. The relay board controls lights and heating (2 spares). The sonof has tasmota installed so I just used the Tasmota plugin for HA for control.
Yes, you are correct, 13.824 cu m. I guess I meant to say that the room was a cube at 2.4m. And it’s only that size because construction timber comes as a standard length of 2.4m and I started with a ceiling hight of 2.4m. And it is a box contructed in the corner of my garage. I would have made it much larger but I had the wife factor to consider.
I can’t really get closer to the issue with this info. Like I wrote before, it looks like temperature raise to me, not interference. Some problem with the relay setup? Temp sensor too close to heat source (even Esp makes heat)?
Keep on eye on your logs. If you can zoom in to those spikes, it might tell something more.
