The ldc1000 is a new Inductor-to-Digital Converter (LDC) from TI, USA. It has the advantages of low power consumption, small package and low cost. Its SPI interface makes it easy to connect to the MCU. Ldc1000 only needs an external PCB coil or self-made coil to realize non-contact inductance detection. Inductance detection of ldc1000 does not refer to the inductance of the test coil like the Q meter, but can test the spatial positional relationship of the external metal object and the test coil connected to the ldc1000.
Using the ldc1000 feature with externally designed metal objects can be easily realized, horizontal or vertical distance detection; angle detection; displacement monitoring; motion detection; vibration detection; metal composition detection; can be widely used in automobiles, consumer electronics, computers, Industrial, communications and medical fields.
Ldc1000 tracing principle
The detection principle of ldc1000 is the principle of electromagnetic induction learned by university physics. Add alternating current to the PCB coil or the self-made coil, and an alternating magnetic field will be generated around the coil. At this time, if a metal object enters the magnetic field, eddy current will be generated on the surface of the metal object. The eddy current is opposite to the coil current and the resulting electromagnetic field is also opposite to that produced by the coil. Therefore, eddy current is a function of the distance, size, and composition of metal objects. The reverse magnetic field generated by the eddy current is coupled to the coil as if it had another secondary coil, thus forming a transformer. By the mutual inductance of the transformer, the parameters of the secondary coil can be detected on this side of the primary coil. According to the above, when the ldc1000 inductor/digital converter is located near the metal material, the value of the sensor changes, and the change can be made to determine whether the metal object is a wire track or a coin. The information is input into the control system for analysis and processing, and a control command is issued to the drive system through the control algorithm, so that the motor driving the left and right wheels of the trolley advances the trolley along the designated trajectory.
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