CJMCU-150 BMM150 Compass Magnetometer

Description

What it is

The CJMCU-150 BMM150 Magnetometer is a geomagnetic sensor that measures the intensity of the Earth’s magnetic field. It can be used to determine direction (north, south, east, west) and for orientation and navigation applications.

Features

• Geomagnetic Sensor BMM150
• I2C Protocol
• Power Supply: 3.3V
• SKU: ARD009105
• Price: 11.31 €

What it is for

The CJMCU-150 BMM150 Magnetometer is ideal for electronics, Arduino, and drone projects that require precise orientation. It can be used to create digital compasses, navigation systems, robots that follow a predefined path, and other motion control projects. It is compatible with Arduino and similar platforms.

Tutorial: How to Use CJMCU-150 BMM150

The CJMCU-150 BMM150 Magnetometer is ideal for orientation and navigation applications. Useful for beginners and intermediate makers.

What you need

• Arduino Uno or Compatible
• Power Supply Cable
• Design Desk
• Arduino IDE Software

Steps

1. 1. Mount the CJMCU-150 BMM150 on a protoboard.
2. 2. Connect VCC to the 3.3V or 5V of the Arduino.
3. 3. Connect GND to the GND pin of the Arduino.
4. 4. Connect SDA to pin A4 (SSD1306) or A5 (ILI9341) of the Arduino.
5. 5. Connect SCL to pin A5 (SSD1306) or A4 (ILI9341) of the Arduino.
6. 6. Load the provided Arduino code.
7. 7. Check the datasheet for the temperature range and accuracy.
8. 8. Test the magnetic orientation with a smartphone app.

Example code

```cpp
#include <Wire.h>
#include <BMM150.h>

BMM150 bmm;

void setup() {
  Wire.begin();
  if (bmm.init() == 0) {
    Serial.begin(9600);
    bmm.setContinuousMode();
    bmm.getHeading();
    while (1) {
      bmm.getHeading();
      Serial.print("Heading: ");
      Serial.println(bmm.heading);
      delay(1000);
    }
  }
}

void loop() {}
```

Mini project

Create a digital compass that indicates direction with an LED.

Common mistakes

• Connect SDA and SCL in reverse.
• Omit I2C bus configuration.
• Forget to check the datasheet.
• Use an incompatible Arduino.

Recommended accessories

• LED
• 220Ω resistor
• OLED SSD1306 Display
• 5V power cable

Frequently asked questions

How can I verify the magnetic orientation?
Use a smartphone app like Compass.

What are the temperature limits?
Check the datasheet for the temperature range.

Does the CJMCU-150 BMM150 work with Arduino Uno?
Yes, it works with Arduino Uno or compatible.