- Hum_probe_capacitive
- humgrondprobe_cap [320x200].png (106.81 KiB) Viewed 2957 times
Is your sensor package like this?
Then at the analogue output of the PCB you may expect
any voltage between 0 and VCC, dependent on the capacity sensed by the pen.
Next is that you have to realise a kind of calibration,
very coarse with following layout:
- pen bone dry = value A
- pen immersed in water (
below markerline!) => value B
Then you have to scale the readings:
ESPEasy v2.x has a built-in 2-Point calibration function for the analogue input, which you could apply to translate the found values A and B to related output-signals to Domoticz. Left boxes to be filled with A and B, right boxes with 0 respectively 100 (for scaling 0 to 100 towards Domoticz), and then set Enabled.
ESPEasy (all versions) also has other facilities for 'tuning/calibration' by means of Rules:
see this
thread in this forum
At the receiving end in Domoticz best (in my experience) is to make as Virtual Device a Custom Sensor:
then you are free to select for display the scale-unit etc..
If you do not use the calibration function of ESPEasy, then you have to implement such function at the Domoticz-side.
Be aware that the readings by means of this type of sensor are far from stable:
approaching or touching the pen with your finger may already cause a variation.
Reproduction of the scaling is a problem, and whether the resulting scale is linear is another debatable aspect!!!!
Therefore the application of a Custom Sensor is also handy:
do not scale in %, but as 'Units', because
that is always valid.
many ways to get there.
Another, similar implementation under this link:
https://www.instructables.com/id/ESP826 ... -Domoticz/
If you want to use 'Leafwetness' or 'Moisture' as Virtual Device in Domoticz, you must calibrate the output from ESPEasy in such way that the output range suits the characteristics for that type of device.
Whether it makes sense, is another story ......