Connection and Calibration Issues – Need Help Debugging

[muradsam5555]

I have carefully soldered all components and inspected them under a microscope—everything looks good. The device successfully connects to WiFi and MQTT, but I’m encountering an issue with calibration.

I performed the calibration process step by step:

1. First, I calibrated in dry soil.
2. Then, I calibrated in wet soil.
3. The calibration process completes successfully, and the device turns off.

However, after restarting, the serial port logs show the error:
Invalid input range, min == max

What could be causing this? Is there a problem with how the calibration values are stored or retrieved after reboot?I've been working on this project for over two months now, but I’m still stuck on this issue. Any advice would be appreciated!

[PricelessToolkit]

OK,

1. Can you see any sensor data on MQTT ?
2. If it publishes sensor readings, check topic "homeassistant/sensor/YourNodeName/" it will have "ROW" ADC value, like "3515"
3. If ADC value present check topic "homeassistant/sensor/YourNodeName/moisture" it will have "Moisture percentage" "0-100"

"Invalid input range, min == max" usually occurs when the mapping function is called with the same value for both the minimum and maximum input range, "sensor hasn't been calibrated properly, or sensor has a soldering issue", you can check it by grabbing sensor with hands and checking MQTT ROW topic then pushing trig button.

[muradsam5555]

I checked MQTT, but there is no data being published at all to 'homeassistant/sensor/YourNodeName/'.
I also haven’t checked 'homeassistant/sensor/YourNodeName/moisture' yet. (I'll check and write tomorrow)

Since nothing is being sent, does this indicate that the sensor isn’t initializing properly? The calibration process completes successfully, but after rebooting, I still get the 'Invalid input range, min == max' error.

What could be preventing the device from publishing data to MQTT? Any suggestions on how to debug this further?

Could this issue be related to the MAC address of the gateway, the Wi-Fi channel, or the local IP settings? Is there anything specific I should check regarding network configuration that might prevent MQTT data from being sent?

[PricelessToolkit]

"Could this issue be related to the MAC address of the gateway, the Wi-Fi channel, or the local IP settings?" no
"configuration that might prevent MQTT data from being sent?" no

Even without calibration it will publish row adc value. so can you spin a local mqtt server ?? to test wit it ?

[muradsam5555]

I understand that even without calibration, the device should publish the raw ADC value. I haven’t tested with a local MQTT server yet, but I will do it later and report back.

[muradsam5555]

At this point, I have set up a local MQTT server. I can connect to it from my phone and send messages. As shown in the screenshot, I sent the letters ‘A’ and ‘AB’ successfully.

Secondly, I soldered a different sensor and set it up. As shown in the screenshot, this one does not give the ‘MIN == MAX’ error, but it still does not send any data.

Am I correct in understanding that it should send data to the topic ‘homeassistant/sensor/murad/’?”**

Also, could you share your contact information, such as Telegram or Discord, so I can reach out to you directly?

[PricelessToolkit]

1. The topic you are checking is not correct.
2. I don't have Discord or Telegram, for support I prefer GitHub.

Correct topics:
homeassistant/sensor/madcrow
homeassistant/sensor/batt
homeassistant/sensor/lx
homeassistant/sensor/airtmp
homeassistant/sensor/soiltmp
homeassistant/sensor/humidity
homeassistant/sensor/moisture
homeassistant/sensor/rssi

[muradsam5555]

I subscribed to the topics you mentioned, but I still don’t receive any values. Based on the screenshots I provided, does everything look correct? Could I be missing something?

[PricelessToolkit]

It's battery-powered Yes ?? when you push the trig button The LED turns on ~1sec and then turns off. ??

[PricelessToolkit]

PS: use MQTT-Explorer client on windows