Hi,
You cannot measure resistance with the power on.
The Arduino was unpowered.
The resistance of the sensor must be measured with a multimeter across the two outside pins of the sensor with them disconnected from the circuit.
Thats indeed my question.
The Arduino is unpowered.
Just GND and the signal pin are connected to the Arduino (what should make no effekt ??, I dont want to dismantle) then I measure the two outside pins of the sensor and get the wrong?? resistance of 1 MOHM.
The only way the resistance can be measured is through the sensor so that GND and the signal are connected with the 1 MOHM resistor and the unplugged Arduino should make no difference??
Also, you have not posted any voltage measurements at the arduino analog input pin taken while running your test code.
As I said previously , until you can post a photo of a multimeter on VOLTAGE (DC) SCALE showing a measurement of 2.5 Vdc
at the arduino analog input pin , I will not believe that your circuit is working . I have given you all the calculations . I have explained how to test and still you have not measured the voltage, your measurements of the sensor are not taken correctly because you had the sensor leads connected to the circuit
I gave you the result of the AnalogRead() command wich is about 60 with no load and up to 1000 with high load what is exactly what you are asking for, just not in volt but the 10 bit equivalent. The Sensor and the displayed values behave absolut correct.
Thanks for your help.
Ralf