# Bidirectional voltage current monitor sensor INA219

- Page: https://sigmanortec.ro/en/bidirectional-voltage-current-monitor-sensor-ina219
- Price: 11.59 RON
- Availability: Out of stock
- Reference: 33148 · EAN: 5940949474966
- Category: Mechatronics and IoT > Sensors and Modules > Voltage and Current Sensors
- Package (shipping data): 0.004 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 02:21 (Europe/Bucharest)

## Description

Compact module for precise measurement of voltage, current and power in DC circuits, ideal for battery management, power supplies and industrial projects. Offers bidirectional current measurement, I2C communication for quick integration with Arduino, ESP32 or Raspberry Pi, integrated 0.1 ohm shunt resistor and calibrated values with typical error up to 1% for stable monitoring.
INA 219 CJMCU-219 bidirectional current voltage monitor sensor, compatible with Arduino and other development boards.
The INA219 sensor module is a high-precision DC current monitor, specially designed for electronic and industrial projects where accurate voltage, current and power measurement are required. This module includes important features such as bidirectional current measurement, I2C interface, integrated 0.1 ohm shunt resistor, maximum error of only 1 percent, zero drift compensation and the ability to directly read calibrated current and power values.
It can monitor bus voltages between 0 and 26 V, supports currents up to approximately 3.2 A and operates with logic voltage between 3 and 5 V, being compatible with most microcontrollers such as Arduino, ESP32 or Raspberry Pi. Its compact design and low cost make it ideal for battery management systems, power supplies, electric vehicles, telecommunications and applications where stable and energy-efficient measurements are needed.
Specifications:
Measured bus voltage: 0 - 26 V
Maximum measurable current: ~3.2 A (depends on shunt resistance)
Integrated shunt resistance: 0.1 ohm
Supply/logic voltage: 3 - 5.5 V
Interface: I2C with support up to 3.4 MHz
Maximum accuracy: approximate error 1 percent
Offset voltage: approx. 100 uV
Resolution: 12 bits
Programmable calibration register
Support for averaging up to 128 samples for noise reduction
Operating temperature: -40 C to +85 C
Dimensions: 22 x 20mm
Pinout:
Pine | Name | Function
VCC | feeding | Powering the module with 3 - 5.5 V
GND | Mass | Common electrical reference
SDA | I2C data | Data line for I2C communication
SCL | I2C clock | Clock line for I2C communication
Wine+ | Positive voltage input | Connect the positive side of the circuit to be measured
Wine- | Negative voltage input | Connect the negative side of the circuit to be measured after the shunt
A0 | Select I2C address | Address bit configuration (GND or VCC)
A1 | Select I2C address | Address bit configuration (GND or VCC)
Use:
Connect the Vcc pin to a 3 - 5 V source and GND to system ground.
Connect the SDA and SCL pins to the microcontroller's I2C bus.
Enter the current to be measured through the Vin+ and Vin- terminals.
Configure the calibration register in the software to obtain direct values in amps and watts.
Uses integrated averaging for applications in high noise environments.
Check the polarity of the connections and avoid exceeding the voltage or current supported by the module.