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Impedance meter based on the Electric Imp
Not sure if this is normal and it simply requires a heatsink, or if it indicates a problem with the circuit.
Based on this forum thread, it seems to be a problem with the SD card slot: http://forums.electricimp.com/discussion/comment/9626#Comment_9626
Possible solutions include using a different card connector or using a different set of i2c pins (8+9).
Could you please share the connection diagram while Interfacing of Ad5933 chip and arduino.
Thank you.
After gain factor calibration, impedance values don't match actual test loads. The gain factor obtained for a 220Kohm resistor (2.3e-10) also doesn't correlate with the example in the AD5933 datasheet ( 5.15e-10 for 200Kohm). The values read from the real and imaginary registers seem to be off.
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