L Meter Click is a compact and accurate Click board™, capable of measuring and monitoring the inductance of the external component. The board can be used to measure a wide range of inductance. The design is based on a single high-speed voltage comparator LM311 by which the frequency of the oscillating LC circuit is measured and, based on the known value of capacitance, measures the unknown inductance value. L Meter Click can be used to measure inductance as well as to check the accuracy and precision of the coil.

L Meter Click is supported by a mikroSDK compliant library, which includes functions that simplify software development.

Click board™ contains all the necessary components needed for a reliable measuring of coil inductance L, which in combination with host MCU makes it ideal in all applications where accurate inductance measuring is needed.Featuring four standard different SMD footprint size and two universal connectors for trought hole components, it's universal tool for any development.

The principle how L Meter Click works is very simple. In series with the measured coil is C1 capacitor, thus forming the LC circuit when the coil is present. The reference value on a high-speed voltage comparator LM311 is a half of the power supply voltage 2.5V. When the coil is added to the comparator input, the transistor briefly drops the coil to the ground, which is at on the half of the power voltage. The coil and the capacitor then start oscillating a resonant frequency that depends on the capacitor and the value of the coils. Since the capacitor has the fixed capacitance, the only variable is the inductance of the coil which can be calculated by: 2 * pi * F = 1 / sqrt (L * C)

This Click board™ is designed to use only next mikroBUS™ pins: PWM output as a Trigger signal and INT – Hardware Interrupt that receive a square wave frequency output from Click board™. Pins PWM and INT and are labeled as TS and FO, respectively. The board has two type of terminals for a coil connection: TB1 screws terminals and TS2 female header terminals. L Meter Click also have four blank SMD places, to allow soldering different SMD coils for measuring directly onboard.

• Interface: GPIO
• Compatibility: mikroBUS™
• Dimensions: 42.9 x 25.4mm
• Input Voltage: 5V

• Schematic
• SLCS007K Datasheet
• mikroSDK
• LibStock