Refoss-P11: Temperature value jumps back and forth when switching ON/OFF

PROBLEM DESCRIPTION

A clear and concise description of what the problem is.

Tasmota 13.1.0 on Refoss-P11: Internal Temperature makes jumps +- 1°C when switching ON/OFF

REQUESTED INFORMATION

Make sure your have performed every step and checked the applicable boxes before submitting your issue. Thank you!

[x] Read the Contributing Guide and Policy and the Code of Conduct
[x] Searched the problem in issues
[x] Searched the problem in discussions
[x] Searched the problem in the docs
[x] Searched the problem in the chat
[x] Device used (e.g., Sonoff Basic): Refoss-P11
[x] Tasmota binary firmware version number used: Preinstalled, updates to latest version
- [x] Pre-compiled
- [ ] Self-compiled
[ ] Flashing tools used: _____
[x] Provide the output of command: Backlog Template; Module; GPIO 255:
```
Configuration output here:
```

11:12:05.449 CMD: Backlog Template; Module; GPIO 255 11:12:05.471 RSL: RESULT = {"NAME":"Refoss-P11","GPIO":[0,0,0,3104,576,32,0,0,320,224,0,0,0,4736],"FLAG":0,"BASE":1} 11:12:05.673 RSL: RESULT = {"Module":{"0":"Refoss-P11"}} 11:12:05.881 RSL: RESULT = {"GPIO0":{"0":"None"},"GPIO1":{"0":"None"},"GPIO2":{"0":"None"},"GPIO3":{"3104":"CSE7766 Rx"},"GPIO4":{"576":"LedLink_i"},"GPIO5":{"32":"Button1"},"GPIO9":{"0":"None"},"GPIO10":{"0":"None"},"GPIO12":{"320":"Led_i1"},"GPIO13":{"224":"Relay1"},"GPIO14":{"0":"None"},"GPIO15":{"0":"None"},"GPIO16":{"0":"None"},"GPIO17":{"4736":"ADC Temp"}}

- [ ] If using rules, provide the output of this command: `Backlog Rule1; Rule2; Rule3`:
```lua
  Rules output here:

[x] Provide the output of this command: Status 0:
```
STATUS 0 output here:
```

11:12:35.435 CMD: status 0 11:12:35.442 RSL: STATUS = {"Status":{"Module":0,"DeviceName":"Tasmota","FriendlyName":["Tasmota"],"Topic":"tasmota_91E3E2","ButtonTopic":"0","Power":0,"PowerOnState":3,"LedState":1,"LedMask":"FFFF","SaveData":1,"SaveState":1,"SwitchTopic":"0","SwitchMode":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"ButtonRetain":0,"SwitchRetain":0,"SensorRetain":0,"PowerRetain":0,"InfoRetain":0,"StateRetain":0,"StatusRetain":0}} 11:12:35.448 RSL: STATUS1 = {"StatusPRM":{"Baudrate":4800,"SerialConfig":"8E1","GroupTopic":"tasmotas","OtaUrl":"http://ota.tasmota.com/tasmota/release/tasmota-4M.bin.gz","RestartReason":"Software/System restart","Uptime":"0T00:10:13","StartupUTC":"2023-08-16T10:02:22","Sleep":50,"CfgHolder":4617,"BootCount":8,"BCResetTime":"2023-08-14T11:39:38","SaveCount":57,"SaveAddress":"F8000"}} 11:12:35.452 RSL: STATUS2 = {"StatusFWR":{"Version":"13.1.0(tasmota-4M)","BuildDateTime":"2023-08-15T07:58:57","Boot":31,"Core":"2_7_4_9","SDK":"2.2.2-dev(38a443e)","CpuFrequency":80,"Hardware":"ESP8266EX","CR":"416/699"}} 11:12:35.457 RSL: STATUS3 = {"StatusLOG":{"SerialLog":0,"WebLog":2,"MqttLog":0,"SysLog":0,"LogHost":"","LogPort":514,"SSId":["Umbrella IoT",""],"TelePeriod":300,"Resolution":"558180C0","SetOption":["00008009","2805C80001000680003C5A0A192800000000","00000080","00006000","00004000","00000000"]}} 11:12:35.469 RSL: STATUS4 = {"StatusMEM":{"ProgramSize":706,"Free":1340,"Heap":21,"ProgramFlashSize":4096,"FlashSize":4096,"FlashChipId":"164068","FlashFrequency":40,"FlashMode":"DOUT","Features":["00000809","8F9AC78F","04368001","000000CF","010013C0","C000F981","00004084","00201000","54000020","00000080"],"Drivers":"1,2,3,4,5,6,7,8,9,10,12,16,18,19,20,21,22,24,26,27,29,30,35,37,38,45,50,62,68","Sensors":"1,2,3,4,5,6","I2CDriver":"7"}} 11:12:35.476 RSL: STATUS5 = {"StatusNET":{"Hostname":"tasmota-91E3E2-0994","IPAddress":"192.168.202.102","Gateway":"192.168.202.1","Subnetmask":"255.255.255.0","DNSServer1":"192.168.202.1","DNSServer2":"0.0.0.0","Mac":"34:94:54:91:E3:E2","Webserver":2,"HTTPAPI":1,"WifiConfig":4,"WifiPower":17.0}} 11:12:35.481 RSL: STATUS6 = {"StatusMQT":{"MqttHost":"","MqttPort":1883,"MqttClientMask":"DVES%06X","MqttClient":"DVES_91E3E2","MqttUser":"DVES_USER","MqttCount":0,"MAX_PACKET_SIZE":1200,"KEEPALIVE":30,"SOCKET_TIMEOUT":4}} 11:12:35.488 RSL: STATUS7 = {"StatusTIM":{"UTC":"2023-08-16T10:12:35","Local":"2023-08-16T11:12:35","StartDST":"2023-03-26T02:00:00","EndDST":"2023-10-29T03:00:00","Timezone":"+01:00","Sunrise":"05:44","Sunset":"20:04"}} 11:12:35.491 RSL: STATUS9 = {"StatusPTH":{"PowerDelta":[0,0,0],"PowerLow":0,"PowerHigh":0,"VoltageLow":0,"VoltageHigh":0,"CurrentLow":0,"CurrentHigh":0}} 11:12:35.499 RSL: STATUS10 = {"StatusSNS":{"Time":"2023-08-16T11:12:35","ANALOG":{"Temperature":27.0},"ENERGY":{"TotalStartTime":"2023-08-14T11:39:38","Total":0.000,"Yesterday":0.000,"Today":0.000,"Power":0,"ApparentPower":0,"ReactivePower":0,"Factor":0.00,"Voltage":0,"Current":0.000},"TempUnit":"C"}} 11:12:35.505 RSL: STATUS11 = {"StatusSTS":{"Time":"2023-08-16T11:12:35","Uptime":"0T00:10:13","UptimeSec":613,"Heap":21,"SleepMode":"Dynamic","Sleep":50,"LoadAvg":19,"MqttCount":0,"POWER":"OFF","Wifi":{"AP":1,"SSId":"Umbrella IoT","BSSId":"E8:ED:D6:88:B4:31","Channel":6,"Mode":"11n","RSSI":76,"Signal":-62,"LinkCount":1,"Downtime":"0T00:00:04"}}}

- [ ] Set `weblog` to 4 and then, when you experience your issue, provide the output of the Console log:
```lua
  Console output here:

TO REPRODUCE

Steps to reproduce the behavior:

TOGGLE ON/OFF and watch temperature value carefully.

EXPECTED BEHAVIOUR

A clear and concise description of what you expected to happen.

Temperature measurement should be stable. The issue is independent of load. It happens with and without load.

Possibly the ADC is experiencing interference due to the switching of relay coil. Or maybe the additional load of the coil has an effect on the ADCs reference voltage.

As a hardware fix is not practicable, I propose to generate a moving mean value and show that on the web interface. Temperature changes are slow and this should not cause any sideeffects.

SCREENSHOTS

If applicable, add screenshots to help explain your problem.

n/a

ADDITIONAL CONTEXT

Add any other context about the problem here.

n/a

(Please, remember to close the issue when the problem has been addressed)

arendst / Tasmota