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Devantech CMPS09 Tilt Compensated Magnetic Compass

The CMPS09 from Devantech is a tilt compensated magnetic compass. Employing a 3-axis magnetometer, a 3-axis accelerometer and a powerful 16-bit processor, the CMPS09 has been designed to remove the errors caused by tilting of the PCB. The CMPS09 produces a result of 0-3599 representing 0-359.9 or 0 to 255.

The output of the three sensors measuring x, y and z components of the magnetic field, together with the pitch and roll are used to calculate the bearing, each of these components are also made available in their raw form. The CMPS09 module requires a power supply at 3.3V - 5V and draws a nominal 25mA of current. There are three ways of getting the bearing from the module - a serial interface, an I2C interface or a PWM output.

An I2C interface is available on many popular microcontrollers such as the BASIC Stamp BS2P and may be easily implemented on most PIC Microcontrollers using the PicBasic Pro compiler.

Examples of using the CMPS09 module with a wide range of popular controllers may be found here.


Technical Details

Voltage 3.3V-5V
Current 25mA typical
Resolution 0.1°
Accuracy 3-4° when horizontal, 4-5° when tilted to ±60°
Output 1 I2C Interface, SMBUS compatible, 0-255 and 0-3599 ,100KHz
Output 2 Serial port, 9600 baud, no parity, 2 stop bits and 3.3V-5V signal levels
Output 3 Timing Pulse (1ms to 37ms in 0.1ms increments)
Dimensions 24mm * 18mm

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Warburton Technology (UK), 33 Selkirk Close, Wimborne, Dorset, BH21 1TN, United Kingdom
VAT Number: GB 846 917 877