Hall Switch 5 Click

How does it work?

Hall Switch 5 Click is based on the AH3965, a high-voltage dual Hall effect sensor from Diodes Incorporated designed for precise speed and direction sensing. This sensor uses a chopper-stabilized architecture paired with an internal bandgap regulator to ensure consistent performance across a wide temperature range, enabling reliable operation in demanding industrial environments. The AH3965 generates two key outputs – speed and direction – accessible through the SP and DIR pins, providing a dependable solution for motion detection systems. To protect internal circuitry and ensure robustness, the sensor incorporates a reverse blocking diode and a Zener clamp on the supply line. In scenarios where the supply voltage drops below the minimum operational threshold, the sensor’s undervoltage lockout mechanism activates, freezing operation to prevent measurement errors and ensure that the output is only updated with accurate, validated magnetic data.

The AH3965 is finely tuned to respond to specific magnetic thresholds, with an operating point ranging from -10 to 30 Gauss (typically 10 Gauss), a release point from -30 to 10 Gauss (typically -10 Gauss), and a magnetic offset tolerance of ±15 Gauss. It maintains magnetic matching within ±25 Gauss, ensuring consistent detection performance across applications. This makes Hall Switch 5 Click an excellent choice for a range of motion-related applications, including industrial motors, pump systems, white goods, and systems that require detection of rotational or linear speed and direction, as well as angular position tracking.

This Click board™ is designed in a unique format supporting the newly introduced MIKROE feature called “Click Snap.” Unlike the standardized version of Click boards, this feature allows the main sensor area to become movable by breaking the PCB, opening up many new possibilities for implementation. Thanks to the Snap feature, the AH3965 can operate autonomously by accessing its signals directly on the pins marked 1-8. Additionally, the Snap part includes a specified and fixed screw hole position, enabling users to secure the Snap board in their desired location.

To support development and testing, Hall Switch 5 Click can be used with an optional rotary magnetic holder, sold separately, which achieves efficient prototyping. This tool features an adjustable shaft fitted with a 6mm diameter magnet that can be aligned directly above the Hall effect sensor. When the magnet moves in the positive x-axis direction – indicating a south pole approaching the sensor’s surface – the south magnetic field strength increases. Movement toward zero indicates a reduction in this field, while movement in the negative x-axis direction corresponds to the north pole approaching the sensor’s marking surface. This precise control and feedback setup enables engineers to quickly evaluate the sensor’s behavior in real-time and streamline their design process.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Click Snap

Click Snap is an innovative feature of our standardized Click add-on boards, designed to bring greater flexibility and optimize your prototypes. By simply snapping the PCB along predefined lines, you can easily detach the main sensor/IC/module area, reducing the overall size, weight, and power consumption – ideal for the final phase of prototyping. For more details about Click Snap, visit the official page dedicated to this feature.

Specifications

Pinout diagram

This table shows how the pinout on Hall Switch 5 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Speed Output	SP	1	AN	PWM	16	NC
	NC	2	RST	INT	15	DIR	Direction Output
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	NC
	NC	6	MOSI	SDA	11	NC
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Hall Switch 5 Click electrical specifications

Software Support

Hall Switch 5 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK‘s open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of the Hall Switch 5 Click board by initializing the device and detecting changes in rotational direction and speed. It logs the direction (Clockwise or Counter-Clockwise) and speed in Hertz every second.

Key Functions

• hallswitch5_cfg_setup This function initializes Click configuration structure to initial values.
• hallswitch5_init This function initializes all necessary pins and peripherals used for this Click board.
• hallswitch5_get_speed_pin This function reads the state of the SPEED pin of Hall Switch 5 Click board.
• hallswitch5_get_dir_pin This function reads the state of the DIR pin of Hall Switch 5 Click board.

Application Init

Initializes the logger and the Hall Switch 5 Click driver.

Application Task

Reads the direction and speed pins periodically, logs the rotational direction and calculates the speed in Hz, which is displayed every second.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output – Use the “Application Output” window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal – Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.