INA219 Bi-Directional Current Sensor I2C Module – CJMCU-219
CJMCU-219 INA219 I2C Bi-Directional Current and Power Sensor – Zero Drift
The CJMCU-219 is a compact breakout board featuring the INA219 chip, a high-accuracy current and power monitor with I2C interface. It measures bi-directional DC current, voltage, and power with excellent linearity and zero drift, making it ideal for battery-powered projects, power monitoring, and energy tracking. The module operates over a wide voltage range and supports standard I2C communication for seamless integration with microcontrollers.
Key Specifications
| Specification | Value |
|---|---|
| Bus Voltage Range | 0 – 26 V DC |
| Current Measurement Range | ±3.2 A (with 0.1 Ω shunt) |
| Resolution | 12-bit ADC (0.1 mA current LSB) |
| Interface | I2C (addresses 0x40 – 0x4F) |
| Logic Voltage | 3.3 V / 5 V compatible |
What You Can Build With This
- Battery fuel gauge for solar or Li-ion systems
- Real-time power consumption monitor for IoT devices
- Overcurrent protection circuit for lab supplies
- Energy auditing tool to profile DC load profiles
Compatibility
This module works with any 3.3 V or 5 V microcontroller that supports I2C, including Arduino Uno, Nano, Mega, ESP8266, ESP32, and STM32 platforms. For Raspberry Pi or other 3.3 V-only boards, direct connection is fine—no level shifting required. Common pairings include the Adafruit INA219 library for Arduino or CircuitPython.
Wiring Notes
Connect VCC to 3.3 V or 5 V, GND to ground, SDA and SCL to the corresponding I2C pins. The I2C lines may need external 4.7 kΩ pull-up resistors if your board does not provide them. For current sensing, wire the load in series with the high-side shunt terminals (Vin+ and Vin-) and ensure the common ground is shared.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino?
Yes, the CJMCU-219 works with standard Arduino libraries like Adafruit INA219. Just connect SDA to A4 and SCL to A5 on Uno boards.
How do I measure currents above 3.2 A?
Replace the onboard 0.1 Ω shunt with a smaller value (e.g., 0.01 Ω) and adjust the calibration register in software; always ensure power dissipation is within safe limits.
Does it measure AC current?
No, this module measures bidirectional DC current. For AC measurement, consider a current transformer or Hall-effect sensor like the ACS712.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
What you can build with this
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items