MagneticSensors

Units

• 1 Tesla = 10 000 Gauss
• 1 mTesla = 10 Gauss
• 1 KA/m = 1.25 mTesla (in Air)

Earth's Magnetic Field

• Earth's magnetic field in <a href="http://en.wikipedia.org/wiki/Earth%27s_magnetic_field">wikipedia</a>
• The average flux density in the Earth's surface is 0.5 Gauss or 50uT

Magnetic sensors suitable for parking sensing

• Allegro micropower linear Hall sensor A1394
• Honeywellmagnetic sensors
• Zetex / Diodes-Incorporated ZMY20magnetic sensor with integrated magnet
• Sparkfun compass module HMC6352
• NXP Compass sensor KMZ51 was a design-reference for years
• Brand new MAG3110 I2C 3-axis Magnetic Sensor

Instrumentation amplifier

• Use in the boards [[INA333[[
• Start tests with INA326 (Available evaluation kit)

Testing

• Testing A1394 Allegro Linear Hall sensor with external magnetic polarization and MSP430F2013 internal instrumentation amp.
• Testing ZMY20M Zetex sensor with INA326 and TI MSP430 Launchpad
• Testing MAG3110 I2C 3-axis magnetic sensor with Arduino
• Testing MAG3110 part2 with MAGPNODE board

Related Links

• Ferrous objects detection

Purchase_Pad

• LAUNCHPAD DEV BRD FOR MSP430G2XX Digikeyprice $4.35
• MSP430F2013IN IC MCU 16BIT 2K FLASH 14-DIP Digikeyprice $2.76
• INA333AIDGKR Micro-Power (50μA) [IC OPAMP INSTR R-R 150KHZ 8MSOP] DigikeyPRICE $5.4
• A1395 Allegro magnetic sensor low power 10mV/Gauss Farnellprice 1.74 BP