A110X Class Reference

API for the A110X Hall Effect sensors. More...

Detailed Description

• ID: a110x
• Name: Hall Effect Sensor
• Other Names: Grove Hall Sensor
• Other Chips: A1101, A1102, A1103, A1004, A1106
• Category: electric
• Manufacturer: seeed
• Link: http://www.allegromicro.com/en/Products/Magnetic-Digital-Position-Sensor-ICs/Hall-Effect-Unipolar-Switches/A1101-2-3-4-6.aspx
• Connection: gpio
• Kit: robok

UPM module for the A110X (A1101, A1102, A1103, A1104, and A1106) Hall Effect sensors. It outputs a digital signal indicating whether it is detecting a magnetic field with south polarity perpendicular to the sensor element.

An example showing a simple test for the presence of a field

    // Instantiate an A110X sensor on digital pin D2
    upm::A110X hall(2);

    // check every second for the presence of a magnetic field (south
    // polarity)
    while (shouldRun) {
        bool val = hall.magnetDetected();
        if (val)
            cout << "Magnet (south polarity) detected." << endl;
        else
            cout << "No magnet detected." << endl;

        upm_delay(1);
    }

An example demonstrating the use of an interrupt handler to count pulses

    // Instantiate an A110X sensor on digital pin D2
    upm::A110X hall(2);

    // This example uses a user-supplied interrupt handler to count
    // pulses that occur when a magnetic field of the correct polarity
    // is detected.  This could be used to measure the rotations per
    // minute (RPM) of a rotor for example.

    hall.installISR(hallISR, NULL);

    while (shouldRun) {
        cout << "Pulses detected: " << counter << endl;

        upm_delay(1);
    }

Public Member Functions
	A110X (int pin)
	~A110X ()
bool	magnetDetected ()
void	installISR (void(*isr)(void *), void *arg)
void	uninstallISR ()

Constructor & Destructor Documentation

A110X

(

int

pin

)

A110x digital sensor constructor

Parameters

pin	Digital pin to use

~A110X

(

)

A110X destructor

Member Function Documentation

bool magnetDetected

(

)

Determines whether a magnetic field of south polarity has been detected

Returns

True if magnetic field detected

void installISR	(	void(*)(void *)	isr,
		void *	arg
	)

Installs an interrupt service routine (ISR) to be called when the appropriate magnetic field is detected

Parameters

isr	Pointer to a function to be called on interrupt
arg	Pointer to an object to be supplied as an argument to the ISR.

void uninstallISR

(

)

Uninstalls the previously installed ISR

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The documentation for this class was generated from the following files:

• src/a110x/a110x.hpp
• src/a110x/a110x.cxx