UNI Hall 3 Click from MIKROE, the embedded solutions company that dramatically cuts development time by providing innovative hardware and software products based on proven standards, is a compact add-on Click board designed for contactless magnetic sensing applications. The board is based on the A31015KEWALT-47SN, a nanopower, ratiometric 1D linear Hall-effect sensor from Allegro MicroSystems, configured for reliable south-pole sensing. It is ideal for high-precision, power-constrained applications such as position sensing, proximity detection, contactless switching, human–machine interfaces (HMIs), industrial automation and smart home devices.
“UNI Hall 3 Click brings exceptional flexibility and precision to magnetic position detection,” says Nebojsa Matic, chief executive of MIKROE. “By combining Allegro’s high-performance Hall-effect sensor with our Click Snap modularity and ClickID automatic board recognition, developers can accelerate prototyping across industrial and smart home applications.”
UNI Hall 3 Click is fully compatible with the mikroBUS socket and can be used on any host system that supports the mikroBUS standard. With a typical bandwidth of 15 kHz, the sensor accurately tracks rapidly changing magnetic fields across an operating range of approximately −2.8 mT to 58.9 mT. At 3.3 V, the sensor delivers a typical sensitivity of 4.7 mV/G, while an onboard VCC SEL jumper enables operation from a 5 V supply to achieve a sensitivity of 7.1 mV/G.
To minimise energy consumption in applications that take periodic readings, the board incorporates GPIO-controlled enable and sleep modes. In active mode at 3.3 V, the IC draws 1.9 mA. In sleep mode, current draw drops to 65 pA, with a typical enable time of 10 µs, making it suitable for low-power embedded designs. The sensor supports an operating temperature range of −40°C to +125°C. Magnet polarity and orientation determine the magnetic field applied along its sensitive axis.
MIKROE’s Click Snap technology allows the sensor section to be detached from the mikroBUS base along predefined PCB lines and installed closer to the magnet or within a compact assembly. Paired footprint pins allow the signals to be reconnected. Onboard ClickID circuitry enables automatic board detection when connected to supported host systems.
The UNI Hall 3 Click demonstration application was developed using NECTO Studio, ensuring compatibility with mikroSDK’s open-source libraries and tools. Designed for plug-and-play implementation and testing, the demonstration is fully compatible with all development, starter and mikromedia boards featuring a mikroBUS socket. The mikroBUS-enabled Click board family now includes more than 2,000 compact add-on development boards that save design time and cost. Hundreds of ready-to-use embedded projects using the UNI Hall 3 Click board are available on EmbeddedWiki.
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