ACS712 Current Sensor Module +-- 5A

This current sensor board is based on the Allegro ACS712ELCTR-05A bi-directional hall-effect current sensor chip that detects positive and negative flowing currents in the range of minus 5 Amps to positive 5 Amps. The board operates at 5V DC and the current flow through the sensor is converted to an output voltage starting at 1/2Vcc (or 2.5V) for no current flow and moves up 185mV per amp for positive current or down -185mV per amp for negative current.

For Example:

• The output voltage at +2 amps would be (2.5V + (0.185 * 2)) = 2.870 V
  
• The output voltage at -5 amps would be (2.5V - (0.185 * 5)) = 1.575 V

Specifications

• VCC: 5V DC Nominal
  
• Measurement Range: -5 to +5 A
  
• Voltage at 0A: VCC/2 (Nominally 2.5V DC)
  
• Scale Factor: 185mV per A
  
• Dimensions:
  
  • Length: 31.73 mm (1.24")
    
  • Width: 13.25 mm (0.52")
    
  • Height: 14 mm (0.55")

Hook Up Diagram

(Click on image to view full size)

Resources

• ACS712 Datasheet (PDF file)
  
• ACS712 Example Arduino Sketch (Zip file)