CJMCU-219 INA219 I2C Bi-directional Current / Power Sensor Module – CDN-0611
CJMCU-219 INA219 I2C Bi-directional Current / Power Sensor
The CJMCU-219 module integrates the INA219 zero-drift, bi-directional current/power monitor. It reports bus voltage, shunt voltage, current, and power over I2C with 1% accuracy. Use it to monitor battery charge/discharge, solar panel output, or any DC load without breaking the circuit.
Key Specifications
| Specification | Value |
|---|---|
| Chip | INA219BID |
| Bus voltage range | 0 – 26 V |
| Current range (with on-board 0.1 Ω shunt) | ±3.2 A |
| Max shunt voltage drop | ±320 mV |
| Resolution | 0.8 mA (12-bit) |
| Interface | I2C, up to 4 selectable addresses |
What You Can Build With This
- Battery capacity tester using Arduino and a load resistor
- Solar panel maximum power point tracker logging voltage/current
- USB power monitor to measure exactly how much current your gadget draws
- Over‑current protection circuit that alerts you via IoT platform
Compatibility
Works with any 3.3V or 5V microcontroller that has I2C, such as Arduino Uno, Nano, Mega, ESP8266, ESP32, or Raspberry Pi. The module’s onboard LDO supplies the INA219 with 3.3V, so you can connect VCC to 3.3V or 5V. I2C logic levels are 3.3V, safe for all boards.
Wiring Notes
Connect the load positive wire to the IN+ terminal and the power source positive to IN+. The module senses current on the high side. SDA and SCL lines connect to your microcontroller’s I2C pins; add 4.7kΩ pull‑up resistors if your board lacks them. Keep the input voltage under 26 V to avoid damaging the shunt.
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 Uno?
Yes. Connect VCC to 5V, GND to GND, SDA to A4, SCL to A5. Use the Adafruit INA219 library to read values instantly.
Can I measure current above 3.2 A?
The onboard 0.1 Ω shunt limits the range to ±3.2 A. You can replace the shunt resistor with a lower value (e.g., 0.01 Ω) to extend range, but recalibrate the library and mind power dissipation.
What does “no drift” mean?
The INA219 uses a zero-drift architecture, so offset voltage remains stable over temperature and time. Measurements stay accurate without routine recalibration.
📦 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.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
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