QMC5883L / HMC5883L 3-Axis Compass
by Honeywell / QST clones
SKU: PSA-CMP-HMC5883
No reviews yetTypical India street price
₹70–₹150
Magnetometer for heading / “north” in outdoor robots.
Interface: I2C
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Concept
Measures Earth’s magnetic field vector.
A little theory
Anisotropic magnetoresistance. Tilt compensation needs an accelerometer too. In the classroom, treat QMC5883L / HMC5883L 3-Axis Compass as a intermediate part using I2C. Typical India street price is about ₹70–₹150. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
I2C read XYZ, atan2(Y,X) for heading. Calibrate hard/soft iron.
Classroom & project use
- Robot compass
- Drone yaw assist
- Sensors classroom demo
Buying in India
Precautions
- Share a common GND with the microcontroller
- Verify polarity and voltage before powering the circuit
Specifications
| Bus | I2C |
| Axes | 3 |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 3.3–5V module |
| Interface | I2C |
Pinout
VCC | GND | SCL | SDA (confirm address with I2C scanner)
