Hi all
I am trying to interface a capacitive moisture sensor with a controller. Since the controller is far away from the sensor we use a 4-20mA voltage to current converter. Initially, a resistive sensor was used and is working fine. But the circuit is not working when I switched to a capacitive sensor. The output of the sensor is 1.6V to 2.8V. I think the output current of the sensor is very low. Is there any method to amplify the current linearly without changing the voltage.
I am trying to interface a capacitive moisture sensor with a controller. Since the controller is far away from the sensor we use a 4-20mA voltage to current converter. Initially, a resistive sensor was used and is working fine. But the circuit is not working when I switched to a capacitive sensor. The output of the sensor is 1.6V to 2.8V. I think the output current of the sensor is very low. Is there any method to amplify the current linearly without changing the voltage.
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