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I am facing problem in interfacing the PMODIA AD5933 board with ARDUINO UNO. I am using the attached Library and Program to find out the impedence, phase and frequency measurement. It is running if the start frequency is set to 1000 Hz in the program. The problem is I'm calibrating with RFB = 100K and Rcal = 100K but the impedance is coming in negative value. PMODIA AD5933 Board Connection with ArduinoUNO Board is : SDA--> A4 SCL--> A5 VCC--> 3.3V/5V GND-->GND ad5933-test.ino arduino-ad5933-master.zip