CIC QMC5883L Breakout - 3-Axis Magnetic MEMS Sensor Breakout

• Overview
• Features
• Specifications
• Hardware
• User Guide
  • Examples
• Buy it Now
• Resources
  • Documents
  • Codes
  • 3D Drawing
• FAQ

Overview

The QMC5883L is a multi-chip three-axis magnetic sensor. The QMC5883L is based on our state-of-the-art, high resolution, magneto-resistive technology licensed from Honeywell AMR technology. Along with custom-designed 16-bit ADC ASIC, it offers the advantages of low noise, high accuracy, low power consumption, offset cancellation and temperature compensation. QMC5883L enables 1° to 2° compass heading accuracy. The I²C serial bus allows for easy interface.

cic_sen0003_qmc5883l_breakout-2

cic_sen0003_qmc5883l_breakout-1

Features

• 3-Axis Magneto-Resistive Sensors in a 3x3x0.9 mm3 Land Grid Array Package (LGA), guaranteed to operate over an extended temperature range of -40 °C to +85 °C.
• 16 Bit ADC With Low Noise AMR Sensors Achieves 2 Milli-Gauss Field Resolution
• Wide Magnetic Field Range (±8 Gauss)
• Temperature Compensated Data Output and Temperature Output
• I2C Interface with Standard and Fast Modes.
• Wide Range Operation Voltage (2.16V To 3.6V) and Low Power Consumption (75μA)
• Software And Algorithm Support Available

Specifications

• QMC5883L - 3-Axis Magneto-Resistive Sensors
• Headers for I2C Interface
• Qwiic connector x 2, easy to debug & use
• Dimension: 28 x 18 x 5 mm

Hardware

cic-sen0003-qmc5883l-breakout-pinout

Pin	Description	Note
VDD	Power supply voltage: 2.2-3.6V
GND	Ground
SDA	I2C interface Data bus	Had external pull-up resistor 4K7
SCL	I2C interface Clock bus	Had external pull-up resistor 4K7
RDY	Data Ready, Interrupt Pin. Default low. Data ready high until data register is read

Default I2C interface 7 bit device address: 0x0D

User Guide

It is the best choice to develop embedded drivers with embedded rust. Because the driver can be used with MCU like ESP32, also used with ARM64 Linux Application, for example raspberry pi directly.

You can download the QMC5883L rust driver with git, also add your rust project with cargo - cargo add qmc5883l.

The examples as below use the first one.

git clone https://github.com/xpulabs/qmc5883l-rs/

Examples

Simple Read QMC5883L Raw Data

This example will simply read QMC5883L raw data.

use std::f32::consts::PI;

use linux_embedded_hal::I2cdev;
use qmc5883l_rs::*;
use qmc5883l_rs::Qmc5883l;


fn main() {
    let dev = I2cdev::new("/dev/i2c-3").unwrap();
    let mut ic = Qmc5883l::new(dev, 0x0D);

    let id = ic.id().unwrap();
    println!(" Qmc5883l id = 0x{:02x}", id);
    std::thread::sleep(std::time::Duration::from_millis(1000));

    ic.set_mode(Mode::CONTINOUS).unwrap();
    ic.set_data_rate(DataRate::DATARATE_200HZ).unwrap();
    ic.set_range(Range::RANGE_8GA).unwrap();
    ic.set_samples(Samples::SAMPLES_256).unwrap();

    std::thread::sleep(std::time::Duration::from_millis(1000));

//    Set declination angle on your location and fix heading
//    You can find your declination on: http://magnetic-declination.com/
//    (+) Positive or (-) for negative
//    For Beijing / China declination angle is -7'41E (negative)
//    Formula: (deg + (min / 60.0)) / (180 / PI);

    let decl_angle = -(7.0 + (41.0/60.0)) / (180.0/PI);
    ic.set_declination_angle(decl_angle);

    loop {
        if ic.data_is_ready().unwrap() {
            ic.get_raw_data().unwrap();
            ic.get_heading_degrees();
            println!("X: {}", ic.v.x_axis);
            println!("Y: {}", ic.v.y_axis);
            println!("Z: {}", ic.v.z_axis);
            println!("Degree: {:.05}", ic.v.heading_degress);
        }
        ic.get_temperature().unwrap();
        println!("T: {} - {}", ic.v.temp, ic.v.temp_raw);

        std::thread::sleep(std::time::Duration::from_millis(100));
    }

}

• /dev/i2c-3 is a i2c controller of rpi.
• The MPU-6050's I²C Device address is 0x34. So we use new function to create a instance. Mpu6050::new(i2c)
• set_mode function will set up work mode
• set_data_rate function will set up data rate
• set_range function will set up the range
• set_samples function will set up the sample number
• set_declination_angle function will set up the declination angle
• get_raw_data function will get raw data
• get_heading_degrees function will get heading degrees
• get_temperature function will get temperature

Use the command as below to build and run the app.

cargo build --target aarch64-unknown-linux-gnu -- example linux-qmc5883l
scp -r ./target/aarch64-unknown-linux-gnu/debug/example/linux-qmc5883l rpi@192.168.6.77:

After login the RPI with SSH, we can execute the app directly.

sudo ./linux-qmc5883l

The terminal will print the raw data & degree, temperature.

Buy it Now

AnalogLamb.Com
Xpulabs.Com

Resources

Documents

QMC5883L Datasheet
Schematic

Codes

Github - qmc5883l-rs

3D Drawing

TBD

FAQ

TBD