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How are current sensors interfacing with PIC microcontroller?
This is a circuit diagram of interfacing the current sensor with a pic microcontroller. Connect the secondary side of CT to the points shown on the schematic. After that, Connect the shunt resistor in parallel with the current sensor. The difference amplifier circuit converts voltage below 5-volt magnitude.
How does a microcontroller read an analog sensor?
Reading an analog sensor involves using an ADC or A/D (Analog To Digital Converter). Which helps the microcontroller to evaluate the voltage level on an analog input pin and converters it to a digital value for further manipulations and storage. There are many ways/schemes to read an ADC with your microcontroller.
How to measure current using an ADC module?
To use the ADC module, we will convert current into voltage form by using a .1 ohm shunt resistor across CT and we will measure this voltage drop across the shunt resistor. Then this voltage drop can be easily converted into current again. For example voltage drop across .1 ohm shunt resistor =8v
How to connect a CT sensor to an Arduino?
CT Sensors – Interfacing with an Arduino To connect a CT sensor to an Arduino, the output signal from the CT sensor needs to be conditioned so it meets the input requirements of the Arduino analog inputs, i.e. a positive voltage between 0V and the ADC reference voltage.
Where is the primary conductor on a window transformer?
Window-type current transformers are also common, which can have circuit cables run through the middle of an opening in the core to provide a single-turn primary winding. To assist accuracy, the primary conductor should be centered in the aperture. CTs are specified by their current ratio from primary to secondary.
How are the windings of a transformer connected?
The designing of the core in the transformer can be done using silicon steel lamination. The transformer’s primary winding carries the current & it is connected to the major circuit. The current in the secondary winding is proportional to the current in the primary winding & it is connected to the meters or instruments.
How is alternating current measured in a microcontroller?
CT is used to measure alternating high current of the order of thousand Amperes. It steps down ac current to lower value so that it can be easily read with the help of microcontroller.