Description:
CJMCU-219 INA219 I2C Interface No Drift Bi-directional Current / Power Supply Monitoring Module
Introducing the CJMCU-219 INA219 I2C Interface Bi-directional Current/Power Monitoring Module—now available at the best price exclusively from Robu, the official reseller in India. This module comes fully equipped with everything you need to get started.
The CJMCU-219 integrates a zero-drift, bi-directional current and power monitoring IC with an I2C interface. Powered by the INA219 chip, it offers industry-leading precision and a compact form factor. It monitors voltage drop across a shunt resistor, senses the supply voltage, and calculates power, making it a highly efficient solution for power monitoring.
This breakout board simplifies power monitoring tasks, eliminating the need for multiple multimeters. With the INA219 chip, you can easily measure both high-side voltage and DC current draw over I2C, achieving 1% precision.
The device is built using the SOT23 package, providing a small, low-cost solution ideal for applications in servers, notebooks, power supplies, battery management, digital electric vehicles, and telecommunications equipment.
A precision amplifier measures voltage across a 0.1, 1% sense resistor, with a maximum input difference of ±320mV, allowing the module to measure currents up to ±3.2A. The internal 12-bit ADC offers a resolution of 0.8mA at the ±3.2A range. For lower currents, the module can measure down to ±400mA with 0.1mA resolution when the gain is set to div8. Advanced users can even replace the 0.1-ohm sense resistor with their own to adjust the current range, for example, using a 0.01-ohm resistor to measure up to 32A with 8mA resolution.
The INA219 operates within a temperature range of -40°C to +85°C, with a maximum accuracy error of just 1% and a maximum offset of 100μV. Its high precision and 12-bit resolution help minimize voltage drop across the shunt resistor, delivering accurate and reliable power measurements.
Circuit Diagram Compatible with Arduino and Display :
INA219 other important features include:
- Calibration programmable registers can directly read its unit of measure is the ampere current, and power in watts per reading.
- For as many as 128 samplings averaging, in order to realize filter in the noise environment.
- The I2C interface has a timeout, not only can avoid the bus lock, but also can provide high-speed mode, meet the communication requirements of up to 3.4 MHz.
- All features are supported software programmable INA219.
- Using a single power supply, the working voltage is between + 3.0 to + 5.5 V.
Features :
- 0.1 ohm 1% 2W current sense resistor
- Up to +26V target voltage
- Up to ±3.2A current measurement, with ±0.8mA resolution
- 0.9″ x 0.8″ PCB
- PCB (no header or terminal block): 1.9g
- Senses Bus Voltages from 0 to 26 V
- 2C- or SMBus-compatible interface. The
- Reports Current, Voltage, and Power
- 16 Programmable Addresses
- Filtering Options
- Calibration Registers
- SOT23-8 and SOIC-8 Packages
Specification:
| Operating Voltage (V) | 3 to 5.5 |
|---|---|
| Accuracy | ±0.5% |
| Operating Temperature (°C) | -40 to 85 |
| Length (mm) | 26 |
| Width (mm) | 22 |
| Height (mm) | 6 |
| Weight (g) | 3 |
Package Includes :
- 1 x CJMCU-219 INA219 Power Supply Monitoring Module
Attachments:
INA 219 datasheet
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| Model | CJMCU-219 |
|---|---|
| Interface / Protocol | I2C |
| SKU | AI0601 |
| Weight | 0.01 kg |
| Availability | Out of Stock |
Applications & Use Cases
The CJMCU-219 INA219 I2C Interface No Drift Bi-directional Current / Power Supply Monitoring Module is a versatile current and voltage sensor used across a wide range of applications including power monitoring, energy metering, battery management, solar panel monitoring, and industrial current sensing.
Common use cases:
- Monitoring power consumption of appliances
- Building a solar panel efficiency tracker
- Current sensing in a battery management system
This product is ideal for power electronics engineers and IoT developers.
Technical Tip: Hall-effect sensors are non-invasive (no wire cutting needed). Shunt-based sensors offer higher accuracy. Match the sensor range to your application.
Shipping & Delivery
- Free shipping on orders above ₹999 across India
- Dispatched within 1-3 business days
- Expected delivery: 3-7 business days depending on location
- Secure packaging to ensure safe transit of electronic components
Amit Parekh (verified owner) –
This CJMCU-219 INA219 I2C Interface No Drift is excellent for the price. My data logging project is working perfectly now.
Ankur Bisht (verified owner) –
This CJMCU-219 INA219 I2C Interface No Drift works great with Arduino. Easy to wire up and code.
Hardik Bhatt (verified owner) –
Bought this CJMCU-219 INA219 I2C Interface No Drift for my college project. Accurate readings, easy to code. Very happy!
Vikram Choudhury (verified owner) –
This CJMCU-219 INA219 I2C Interface No Drift is a must-have for sensor projects. Plug and play with Arduino.
Pallavi Banerjee –
Good quality CJMCU-219 INA219 I2C Interface No Drift. Some variation in readings but within acceptable range.
Anushka Nayak (verified owner) –
Good quality CJMCU-219 INA219 I2C Interface No Drift. Some variation in readings but within acceptable range.
Aman Shah (verified owner) –
Perfect for my weather station. This CJMCU-219 INA219 I2C Interface No Drift gives consistent readings day and night.
Sandeep Krishnan (verified owner) –
Superb CJMCU-219 INA219 I2C Interface No Drift! Using it in my environmental monitoring system. Very reliable data.
Lokesh Chatterjee (verified owner) –
Excellent CJMCU-219 INA219 I2C Interface No Drift! Readings are accurate and consistent. Perfect for my project.
Kapil Bisht (verified owner) –
Excellent CJMCU-219 INA219 I2C Interface No Drift! Readings are accurate and consistent. Perfect for my project.
Lakshya Krishnan (verified owner) –
Pretty good CJMCU-219 INA219 I2C Interface No Drift. Documentation could be better but the sensor itself is solid.
Annu Verma (verified owner) –
Ankur Khanna (verified owner) –
Excellent CJMCU-219 INA219 I2C Interface No Drift! Readings are accurate and consistent. Perfect for my project.
Krishna Shah –
Perfect CJMCU-219 INA219 I2C Interface No Drift for my automation project. Integrates seamlessly with my microcontroller.
Alvin (verified owner) –
working fine