ACS712 – Current Sensor


Electronic brick of current sensor is based on ACS712 sensor, which can accurately detect AC or DC signals. The maximum AC or DC that can be detected can reach 5A, and the present current signal can be read via analog I / O port.


1. Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market.

2. With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock.

3. Terminals with screws for easy wiring and removing.


PCB size 30.0mm X 24.0mm X 1.6mm
Working voltage 5V
Input current type AC or DC
Compatible interfaces 2.54 3-pin interface and 4-pin Grove interface(1)
Wiring interface Power terminal(2)

Note 1 S for analog output port, V and G for voltage at the common collector and ground respectively

Note 2: “+”for current inflow port“-”for current outflow port

Electrical characteristics

Parameter Min.     Typical     Max.     Unit
Supply voltage 4.5 5 5.5 VDC
Working current(VCC=5V) 10 13 mA
Output impedance RLOAD(VIOUT to GND) 4.7
Bandwidth(1) 34 Hz
Input current range -5 5 A
Sensitivity 180 185 190 mV/A

Note 1: After removing C1, bandwidth can reach 80kHz

Relationship between output voltage and induced current


Connect S port of electronic brick of current sensor to A0 port of Arduino board, and we will use the following program to read the analog value and send it to the computer for display via serial port.


Post Author: TORTUGA

궁금하신 점은 새로 개편한 홈페이지의 QnA 게시판을 이용해주세요!!!!!!!

1 thought on “ACS712 – Current Sensor

    Jeon One

    (2014년 8월 18일 - 3:56 오후)

    궁금한게 있는데여.. 전류 계산 식은 어떻게 계산이 되는 건지 설명을 부탁드려도 될까요?

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