Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	MCU-219
Interface Type	I2C
Chipset	INA219
Max Bus Voltage	26V DC
Max Shunt Current	3.2A (with 0.1Ω resistor)
Current Resolution	1mA
Power Supply	3.3V - 5V
Drift Characteristic	Zero Drift Architecture
Dimensions	24mm x 15mm x 4mm
Weight	3.5g

6 reviews

Anonymous

Mar 23, 2026

Rating: 4/5

Great accuracy for the price

I compared readings against a multimeter and they were within 1% margin. The zero drift feature really helps maintain consistency over long test runs. Only wish the shunt resistor could handle slightly higher currents.

Anonymous

Mar 16, 2026

Rating: 5/5

Must-have for power analysis

If you are doing any serious embedded development involving power management, this is a must-have tool. The real-time data logging capabilities are impressive for such a small module.

Anonymous

Mar 14, 2026

Rating: 5/5

Compact and reliable

Small form factor fits perfectly inside my robot chassis. Setup took less than 10 minutes using the standard Adafruit library. Highly recommended for battery monitoring applications.

Anonymous

Mar 10, 2026

Rating: 5/5

Excellent documentation support

The datasheet is clear, and there are plenty of tutorials online. The bidirectional capability is useful for tracking charge and discharge cycles in my Li-ion packs.

Anonymous

Mar 09, 2026

Rating: 4/5

Good value sensor

Works as advertised. The soldering pads are well-sized for hand soldering. I deducted one star because the included header pins were slightly bent upon arrival, but easily fixed.

Anonymous

Mar 05, 2026

Rating: 5/5

Perfect for Arduino projects

This module works flawlessly with my Arduino Uno. The I2C communication is stable, and the library support is excellent. Measuring current and voltage simultaneously makes debugging power issues very easy.

5 FAQ

Q: Is this compatible with Raspberry Pi?

A: Absolutely. Since it uses the I2C protocol, it is fully compatible with Raspberry Pi GPIO pins. Just ensure you enable the I2C interface in your Pi settings.

Q: Do I need an external pull-up resistor for the I2C lines?

A: Most breakout boards, including this MCU-219, come with onboard pull-up resistors. You generally do not need external ones unless you have multiple devices on the same bus causing signal issues.

Q: What is the maximum voltage this can handle without damage?

A: The module is rated for up to 26V DC on the bus line. Exceeding this voltage may permanently damage the sensor.

Q: Can I change the shunt resistor to measure higher currents?

A: Yes, advanced users can replace the onboard 0.1Ω shunt resistor with a lower value resistor to measure higher currents, but you must recalibrate the sensor in your code accordingly.

Q: Can this module measure negative current?

A: Yes, the INA219 chip supports bidirectional current measurement, allowing it to detect both charging and discharging states.

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