Control method and circuit of photoelectric induction knob

Abstract

The invention discloses a control method of a photoelectric induction knob. The control method comprises the steps that two or more groups of optical signals generated during rotation of the knob are received, the two groups of optical signals are subjected to photoelectric conversion, and first pulse electric signals and second pulse electric signals corresponding to the two groups of optical signals respectively are formed; the phase of the first pulse electric signals and the phase of the second pulse electric signals are detected respectively; the rotating direction of the knob is judged according to the phase of the first pulse electric signals and the phase of the second pulse electric signals; the first pulse electric signals and the second pulse electric signals are counted according to the rotating direction of the knob, the phase of the first pulse electric signals and the phase of the second pulse electric signals, and corresponding control signals are set according to the calculated number of pulses. The invention further provides a control circuit of the photoelectric induction knob. By means of the technical scheme, the service life of the knob can be prolonged, occupied space can be reduced, the wireless connection functional control is achieved, the requirement for PCB miniaturization is met, the structure is simple and effective, practicability is high, and cost is low.

Description

technical field [0001] The invention relates to the technical field of electronic devices, in particular to a control method and circuit of a photoelectric induction knob. Background technique [0002] Adjusting knobs are widely used in various electronic products, such as volume knobs for car audio, radio station selection knobs, air volume / temperature adjustment knobs for air conditioners, etc. [0003] The traditional adjusting knob device usually adopts a structure similar to a variable potentiometer or an encoder to realize its function. see figure 1 , is a schematic diagram of an installation structure of an existing rotary adjustment device. Specifically, the knob 11 and the variable potentiometer (or encoder) 12 are combined and fixed on the panel 13, and the variable potentiometer (or encoder) 12 is realized by being installed on the PCB (printed circuit board) 14. The control function obtains signals such as power supply through the connector 15 on the PCB14. i...

AI Technical Summary

Problems solved by technology

It can be seen that the traditional variable potentiometer (or encoder) 12 has limited the design of its overall structural device due to its large device footprint and is difficult to meet the increasing PCB miniaturization requirements.

[0005] In addition, since the variable potentiometer (or encoder) 12 needs to be installed on the PCB 14 for fixing and connecting to the electronic circuit, and then the knob 11 is installed for supporting use, such a fixed wired connection is easily affected by external forces and the connection is interrupted. And other problems will inevitably affect the overall performance of the adjustment knob

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