In the ACS712, sensing current starts with a phenomena known as Faraday's Law (of Induction). How does this little chip take current from one circuit and produce a proportional output voltage without physically connecting the two circuits? Faraday's Law of Induction This section provides a quick recap of electromagnetic concepts that make this current sensor possible. Voltage, Current, Resistance, and Ohm's Law.Here are some topics related to this hookup guide you may want to review: Required MaterialsÄepending on the equipment available to you, you will need some of the following items to follow along with this hookup guide: Suggested Reading This sensor is not recommended for current sensing lower than 10's of milliamps. The amplified breakout board is capable of sensing very small currents down to around 10mA and large currents up to 5A! However, since the output is analog, your usable readings will be limited by noise and the resolution of the ADC reading the output. ![]() This means that, although your Arduino is running on 5V, the sensed circuit can be operating at higher DC or AC voltages! ![]() The advantage of using a Hall effect sensor is that the circuit being sensed and the circuit reading the sensor are electrically isolated. The ACS712 sensor uses a Hall effect sensor to output a voltage relative to the current flowing through the IP+ and IP- pins.
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