Voltage Current Sensor Module - DC 3-25V / 0-3A...
Voltage Current Sensor Module - DC 3-25V / 0-3A...
Voltage Current Sensor Module - DC 3-25V / 0-3A - MAX471
Voltage Current Sensor Module - DC 3-25V / 0-3A - MAX471

Voltage Current Sensor Module - DC 3-25V / 0-3A - MAX471

Sensors
DET715
Part.No: MAX741
€5.95
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MAX471 Voltage & Current Sensor Module measures DC 3–25V and 0–3A via analog output, compatible with Arduino and microcontrollers. Uses the MAX471 current-sense amplifier chip combined with a resistive voltage divider for dual-parameter power monitoring.

 

The MAX471 Voltage and Current Sensor Module (MPN: MAX741) is a compact, dual-parameter power monitoring module that simultaneously measures DC voltage (3–25V) and current (0–3A). It combines the MAX471 current-sense amplifier IC with a resistive voltage divider, delivering analog output signals that connect directly to the analog input pins of Arduino or any microcontroller with an ADC. If you need to know how much power your circuit is consuming in real time, this module gives you both measurements with a single board.

Key Features

  • Dual Measurement: Monitors voltage and current simultaneously → calculate real-time power consumption (P = V × I) with just two analog reads
  • MAX471 Current-Sense Amplifier: Dedicated IC for accurate current measurement up to 3A → reliable readings without large shunt resistors
  • Resistive Voltage Divider: Scales the input voltage down to ADC-safe levels → safely measure up to 25V from a 5V microcontroller
  • Direct Analog Output: Voltage and current outputs connect straight to analog pins → no additional signal conditioning required
  • Wide Voltage Range: DC 3–25V input covers common battery and bench-supply voltages → suitable for Li-ion, lead-acid, and regulated supplies

Pinout & Wiring

PINSymbolDescription
1VCCModule power supply (connect to Arduino 5V)
2GNDCommon ground
3V_OUTAnalog voltage output → connect to Arduino analog pin (e.g. A0)
4I_OUTAnalog current output → connect to Arduino analog pin (e.g. A1)
5V+Positive terminal of the circuit under test (load input)
6V−Negative terminal / load output (GND side)

Wiring note: Connect the load in series through the module's current path (V+ → module → load → V−). Read V_OUT and I_OUT with analogRead() and apply the module's scaling factor to convert the ADC value to volts and amperes.

Compatibility

  • Arduino UNO / Nano / Mega: 5V logic — connect VCC to 5V; V_OUT and I_OUT are within the 0–5V ADC range ✔
  • ESP32 / ESP8266 / Raspberry Pi Pico: 3.3V logic — use a voltage divider or level shifter on V_OUT/I_OUT before connecting to 3.3V ADC pins to avoid damage
  • Any microcontroller with ADC: Compatible as long as the analog input range matches the output signal level

Typical Applications

  • Battery monitoring systems — track state-of-charge and detect over-discharge in Li-ion or lead-acid packs
  • Solar / renewable energy loggers — measure panel output voltage and current in real time
  • DIY power meters — build a benchtop watt-meter for lab use with an Arduino and LCD display
  • Smart charger projects — monitor charging current and cut off when the battery is full
  • Motor driver monitoring — measure current draw of DC motors to detect stalls or overloads

Technical Specifications

ParameterValue
InterfaceAnalog output (voltage & current)
Input Voltage RangeDC 3–25V
Current Measurement Range0–3A
Main ICMAX471 (Current-Sense Amplifier)
Voltage Measurement MethodResistive voltage divider
MPNMAX741

FAQ

Q: Can I use this module with a 3.3V microcontroller like the ESP32?
A: The module's VCC is designed for 5V. The analog outputs may exceed 3.3V depending on the measured values, so add a voltage divider on V_OUT and I_OUT before connecting to a 3.3V ADC to prevent damage.

Q: How do I convert the analog reading to actual amperes?
A: Read the raw ADC value with analogRead(), convert it to a voltage (ADC_value × 5.0 / 1023), then apply the MAX471 output sensitivity (approximately 1V per 1A) to get the current in amperes. Always verify with the datasheet for your specific module variant.

Package Contents: 1 × MAX471 Voltage & Current Sensor Module

⚠ Warning: Do not exceed the maximum input voltage of 25V or the current rating of 3A. Exceeding these limits may permanently damage the MAX471 IC. Ensure correct polarity before powering the circuit.
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