MAX471 Voltage & Current Sensor Up to 25V & 3A DC


The MAX471 Voltage & Current Sensor measures both current and voltage, thus making it ideal for a quick power measurement.

It is powered by the source to be measured.   The maximum measurable current is three amps and the voltage measurement range is from 3 volts to 25 volts. This tutorial shows you how to make both these measurements and combine them into a power measurement.

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You can use the MAX471 Voltage & Current Sensor module to test the current and voltage. The principle of voltage test based on principle of resistive voltage divider design, can make the load connected terminal connector input voltage to 5 times smaller. Arduino analog input voltages up to 5 v, 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).

Arduino 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 0.00489Vx5=0.02445V.

MAX471 Voltage & Current Sensor Connectivity

MAX471 Voltage & Current Sensor Up to 25V & 3A DC

GND:   All of the grounds are connected to the same electrical point

VOUT:  Connects the high side of your load

VIN:  Connects to the Positive Pole of your voltage source  ( This can be anywhere from 3 to 25 Vdc )

AT:  Provides 0 to 5V signal that is scaled to 1 V per amp.

VT:  Provides a 0 to 5V signal that is scaled to 1 volt per for every 5 volts input



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