From the outside, the pulse potentiometer is the same as the ordinary potentiometer with three pins, but inside it is connected to pins 1 and 2 are two metal static pieces of different lengths, and the one connected to pin 3 is a circle Metal rotor with 12 or 24 teeth. When the pulse potentiometer rotates, there are four states: pin 3 is connected to pin 1, pin 3 is connected to pin 2 and pin 1; pin 3 is connected to pin 2, pin 3 is connected to pin Pin 2 and pin 1 are all disconnected.
In actual use, generally the pin 3 is grounded as the data input terminal. The pins 1 and 2 are connected to the IO port of the single-chip microcomputer as the data output terminal. As shown in the figure, connect pin 1 to P1.0 of the microcontroller, and pin 2 to P1.1 of the microcontroller. When the pulse potentiometer rotates left or right, P1.0 and P1.1 will periodically generate the waveform shown. If the pulse potentiometer rotates at 12 o'clock, it will generate 12 sets of such waveforms, 24 o'clock. The pulse potentiometer will generate 24 groups of such waveforms; a group of waveforms (or a cycle) contains 4 working states. Therefore, as long as the waveforms of P1.0 and P1.1 are detected, it is possible to identify whether the pulse potentiometer is rotating left-handed or right-handed.
When a voltage is applied between the two fixed electric shocks of the resistor body, the position of the contact on the resistor body can be changed by rotating or sliding the system, and a corresponding position of the movable contact can be obtained between the movable contact and the fixed contact. A certain relationship of voltage. It is mostly used as a voltage divider, which is a four-terminal component of the potentiometer. The potentiometer is basically a sliding rheostat, there are several styles, generally used in the speaker volume switch and laser head power size adjustment potentiometer is an adjustable electronic component. It is composed of a resistor body and a rotating or sliding system. When a voltage is applied between the two fixed electric shocks of the resistor body, the position of the contact on the resistor body can be changed by rotating or sliding the system, and a corresponding position of the movable contact can be obtained between the movable contact and the fixed contact. A certain relationship of voltage.
Working principle of rocker potentiometerWhen the rocker potentiometer is used as a current regulator in a DC circuit, current will flow through the sliding arm of the rocker potentiometer. At this time, the resistance value will increase abnormally due to anodization. In this case, it is recommended to connect the terminal of the resistor to the negative pole and the sliding arm to the positive pole. If the DC current passes directly through the rocker potentiometer, the anode of the rocker potentiometer will be oxidized and damaged, which will increase the impedance of the rocker potentiometer. Therefore, it is best to connect the negative electrode of the current to the terminal that is in contact with the carbon diaphragm. The positive pole is connected to the terminal of the brush (the contact piece of the rocker potentiometer). When the rocker potentiometer is used as a variable resistor, it is recommended to use it as a voltage divider to adjust the voltage. At the same time, the load resistance RL of the rocker potentiometer should not be less than 10 times the nominal resistance RT of the rocker potentiometer.
Regarding the volume rotation adjustment knob on the radio, a potentiometer is generally used. The potentiometer is mainly composed of three components with terminals. Among them, there is a fixed-value resistance between two fixed terminals, and the other end is Sliding on this resistor body through the contact. However, since the potentiometer is an electromechanical component, it relies on the sliding of the brush on the resistor body to obtain an output voltage that has a certain relationship with the displacement of the brush. Then the resistance value of the sliding end and the fixed end of the potentiometer will be changed. The size changes with the position of the sliding end. That is to say, the radio potentiometer obtains different signal voltages of different strengths by changing the position of the sliding end on the resistor body, so as to realize the adjustment of the operation control volume.
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