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NVE Inexpensive Microcontroller Interfaces
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NVE Inexpensive Microcontroller Interfaces

on Wednesday, 28 February 2018. Posted in News

NVE Inexpensive Microcontroller Interfaces

With their high output signals, GMR sensors are easy to interface to inexpensive eight-bit microcontrollers. The ATtiny85 is a popular choice because it has an available differential amplifier with a selectable gain of 20; has I2C, PWM, and digital I/O; it has an internal temperature sensor that can be used for temperature compensation in critical applications; and costs less than $1.00.

Inexpensive Microcontroller Interfaces

With their high output signals, GMR sensors are easy to interface to inexpensive eight-bit microcontrollers. The ATtiny85 is a popular choice because it has an available differential amplifier with a selectable gain of 20; has I2C, PWM, and digital I/O; it has an internal temperature sensor that can be used for temperature compensation in critical applications; and costs less than $1.00.

The gain of 20 is ideal for NVE GMR analog sensors. AALSeries sensors, for example, have a maximum output of 45 mV/V, so a gain of 20 provides 900 mV/V, or nearly full scale. That means all 10 bits of microcontroller ADC resolution are used.

The ATtiny85 only has eight pins microcontroller, but that’s enough to interface to the sensor and provide digital and PWM outputs.

Microchip offers a development environment and evaluation kits, and there are several single-board computers such as Trinket and Little Wire boards.

Here’s a typical interface using a Trinket board
:

Trinket Interface
AA-Sensor Interface to Low-End Microcontroller


Here’s a live demonstration of the circuit above, including a simple Arduino program to amplify, offset correct, and temperature compensate the outputs:

In the News:
Nondestructive Evaluation

NDE 3D Graph

With their high sensitivity and low noise, NVE analog sensors are popular for nondestructive evaluation.

Here are some examples of publicly-available papers describing applications:

  Eddy Current Testing with Giant Magnetoresistance (GMR) Sensors and a Pipe-Encircling Excitation for Evaluation of Corrosion under Insulation
Three perpendicularly-aligned AA004 sensors used in an eddy current nondestructive testing system for pipes.
 
  Non-Destructive Detection of Wire Rope Discontinuities from Residual Magnetic Field Images Using the Hilbert-Huang Transform and Compressed Sensing (.pdf)
An array of 18 AAH002 sensors excited by small magnets placed end-to-end to form a magnetic strip are used to detect cable defects.
 
  Flexible GMR Sensor Array for Magnetic Flux Leakage Testing of Steel Track Ropes (.pdf)
An array of 12 AA004-02 sensors on a flexible circuit board was wrapped around thick steel ropes for nondestructive testing of the ropes, and was demonstrated to effectively detect defects and provide spatial information for imaging.
 
  Nondestructive Inspection (NDI) for Diffusion Bonded Components (.pdf)
An array of eight AAH002 sensors produces eddy current maps for nondestructive inspection.

Visit our “Case Studies” Webpage for More >
Download our Analog Sensor Datasheet >

Upcoming Exhibitions

Embedded World 2018 
 
NVE distributor Hy-Line Power will display NVE products at Embedded World, February 27 to March 1, at Halle 1/Stand 170, Messe Nürnberg, Germany.  
 
Featured new products will include the IL3685-1E 40 Mbps Ultrahigh Speed QSOP Transceiver and IL2985E Low-Power Transceiver.

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