ZMCT102 is a Micro precision current transformer having current ratio of 5A/2.5mA.ZMCT102 is the best choice to measure the AC current using a microcontroller. This CT is very easy to mount on PCB, It also provides high galvanic isolation and very high accuracy.
This current transformer module makes it easy to measure AC current upto 5 Amps. ZMCT102 is a small size PCB mount CT with 2000:1 turns ratio and Dimensions: 18.2 x 12 x 19.2 mm(LxWxH).
Where to Buy?
The is available in many Chinese online stores. Its price varies, but you can get it for approximately $0.59 in most stores.
To connect a ZMCT102 sensor to an microcontroller board, the output signal from the CT sensor needs to be converted into the measurable range of microcontroller analog inputs signal range, which is +ve voltage between 0V and the ADC reference voltage (5V if no ADC Reff is supplied) .
To do this job the below circuit diagram is used,
The output of ZMCT102 is a current signal of 2.5ma, which needs to be converted to a voltage signal using a burden resistor. See the calculation of Burdon resistor of SCT-013 for reference.