GY-471 (MAX471) Current Sensor Module (max 3A) Ampere Read Detect, Arduino Raspberry Pi Compatible [ElectricA]

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✍ The MAX471 module (HCSENS0041) is a complete, bidirectional, highside current-sense amplifier for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, since it does not interfere with the ground paths of the battery chargers or monitors often found in “smart” batteries. The MAX471 has an internal 35mΩ current-sense resistor and measures battery currents up to ±3A. The module has a built-in 2K Ohm sens resitor giving the module a full sensor range of +/- 3A. An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged. Operation is from 3V to 36V, and draws less than 100µA over temperature

The module is also supplied with optional 2 way screw terminal and 0.1" pitch header (requires soldering).

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▼ Descriptions:
  Product code: HCSENS0041
  Current sens max: +/- 3A
  Current sens working voltage: 3 to 36V
  Sensor output: 1V / Amp
  Dimensions: 20mm x 19.5mm

  Test Voltage range: DC3 - 25V (Ard uino work on 5V) or DC3 - 16.5V (work on 3.3V)
  Test Current range: DC 0 - 3A 

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▼ Pinout Sensor :
  RS+ ......… Load positive supply (3 to 36V)
  RS- .......… Connect to load or charger

▼ Interface :
  RS+ ......… Alternative load positive supply (3 to 36V)
  GND ......… Connect to loads 0V/GND supply
  OUT .......… Current sensor output (1V / Amp, 3V max)
  SIGN .....… Current flow direction. An open-collector logic output (low = current flow from RS+ to RS-).
  GND ......… Alternative GND (Connect to loads 0V/GND supply)
  RS- ........… Alternative load/charger connection.

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Tips:
The voltage detection module input voltage not greater than 5Vx5 = 25V (if using 3.3V systems, input voltage not greater than 3.3Vx5 = 16.5V). 
AVR chips have 10-bit AD, so this module simulates a resolution of 0.00489V (5V / 1023), so the minimum voltage of input voltage detection module is 0.00489 Vx5 = 0.02445V.