JP2002340609A - Rotary encoder input detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the number of input terminals of a microcomputer with two input terminals regardless of the number of rotary encoders in a rotary encoder input detecting device. SOLUTION: This rotary encoder input detecting device has the input terminals A and B of microcomputer, having the function of discriminating an output signal by A/D conversion on the output signal from the rotary encoders (hereinafter referred to as RE), voltage dividing resistances R5 and R6 connected to the individual REs, and a microcomputer 1 for internally storing a constant corresponding to an output voltage value by the individual dividing resistances. Since the microcomputer can discriminate and determine which RE is operated by referentially comparing and determining the voltage value with an RE input voltage constant inside of the microcomputer simultaneously when executing the A/D conversion on the voltage value from the individual REs inputted to an A/D terminal of the microcomputer 1, even if an apparatus requires a large number of REs, the REs can be easily increased without increasing the input terminals for the REs.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input detection device for a rotary encoder, which is used for function setting, information input, and selection of devices in electric / electronic devices, information devices, industrial devices, and the like. .

[0002]

2. Description of the Related Art FIG. 3 shows an input device of a conventional rotary encoder (hereinafter abbreviated as RE).

In FIG. 3, reference numeral 1 denotes a microcomputer which detects and determines an output signal from the RE, RE1 denotes a rotary encoder, SW1A denotes a signal contact of RE1, and SW1B denotes SW.
1A and a signal contact of a pair of REs, A is a signal input terminal of the RE1 from the SW1A, B is a signal input terminal of the RE1 from the SW1B, and R1 and C1 are used to remove spike noise generated when the contacts of the SW1A are opened and closed. Resistance and capacitor, R2 and C2
Is a resistor and a capacitor for removing peak noise when the contact of SW1B is opened and closed, R3 is an A terminal of the microcomputer 1 and a pull-down resistor of SW1A, and R4 is a B terminal and SW1 of the microcomputer 1.
B is a pull-down resistor.

Similarly, in FIG. 3, RE2 is a rotary encoder similar to RE1 described above, SW2A is a signal contact of RE2, SW2B is a signal contact of SW2A and a pair of REs, and C is a signal from SW2A of RE2. Input terminal,
D is a signal input terminal from SW2B of RE2, R5 and C3
Is a resistor and a capacitor for removing the peak noise generated when the SW1A contacts are opened and closed, R6 and C4 are resistors and capacitors for removing the peak noise when the SW1B contacts are opened and closed, and R7 is the C terminal of the microcomputer 1 and the SW2A. Pull-down resistor, R
Reference numeral 8 denotes a D terminal of the microcomputer 1 and a pull-down resistor of SW2B.

[0005]

However, in the above-described conventional configuration, two input terminals of the microcomputer are required for one RE, and in a device in which a plurality of REs are arranged, the number of REs is reduced. Double the number of microcontroller input terminals is required, and among the limited number of microcontroller terminals, the more multifunction and multi-input judgment devices are required, the more the number of REs reduces the number of microcontroller input / output terminals. Had the problem of doing so.

The present invention solves the above-mentioned conventional problem. Even if a plurality of REs are installed in one microcomputer, the number of input terminals of the RE as the microcomputer is the same as in the conventional case, and two input terminals are required. An object of the present invention is to provide an input device for an RE that can be realized.

[0007]

In order to solve the above-mentioned conventional problems, an RE input device of the present invention uses a plurality of REs for one microcomputer to detect and determine an output signal from the RE. Is not connected individually to each input terminal of the microcomputer, but an individual voltage dividing resistor is set for each RE, and the output voltage from each RE divided for each RE is output to the A / It is configured to be connected in parallel to a microcomputer input terminal having a D input (converting a voltage analog value to a digital value) function.

Thus, even if the outputs from a plurality of REs are connected to the same input terminal of the same microcomputer, the microcomputer detects and determines the difference in the output voltage from each RE, and which RE is operated. Is determined by the microcomputer and reflected in the operation of the device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is an apparatus provided with a plurality of rotary encoders, an apparatus provided with an input device for inputting signals from the plurality of rotary encoders, and By connecting output signals from individual rotary encoders to the input terminals of the microcomputer in parallel in a control device equipped with a control device for controlling, even if multiple rotary encoders are assigned to one microcomputer, The input terminals of the rotary encoder can be configured with only two rotary encoders, and even in equipment that requires multiple functions and multiple inputs in which a large number of rotary encoders are arranged, the input terminals of the microcomputer for the number of rotary encoders It is easy to configure devices with multiple rotary encoders without reducing Can.

[0010] The invention described in claim 2 is particularly advantageous in claim 1.
Even if the rotary encoder input detection device described in is connected in parallel to the same input terminal of the microcomputer,
By providing a dividing resistor for setting the output voltage difference for each rotary encoder, and by inputting the output voltage from the rotary encoder to the input terminal of a microcomputer having an A / D function, the output of the plurality of rotary encoders is Even if they are connected to the same input terminal of the microcomputer, the microcomputer identifies and determines the input from each rotary encoder. Equipment can be configured.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, reference numeral 1 denotes a microcomputer which detects and determines an output signal from an RE, and A denotes an input terminal A of a microcomputer having a function of A / D converting an output signal from the RE. , B also have the function of A / D converting the output signal from the RE similarly to A. Input terminals B and R1 of the microcomputer have a pull-down resistor for the A input terminal of the microcomputer, R2 has a pull-down resistor for the B input terminal of the microcomputer, C1 is a noise removing capacitor for the A input terminal of the microcomputer; C2 is a noise removing capacitor for the B input terminal of the microcomputer;
The input terminal noise reduction resistor R4 indicates a microcomputer B input terminal noise reduction resistor.

Next, RE1 is a rotary encoder 1,
SW1A is a signal contact A, SW interlocked with the rotation axis of RE1.
Reference numeral 1B denotes a switch 1A and a pair of signal contacts B interlocked with the rotation axis of RE1, and a common connection terminal of SW1A and SW1B of RE1 is connected to a drive power supply of the microcomputer and a reference voltage terminal for A / D of the microcomputer.

As described above, when the contact of SW1A is closed, the power supply voltage of the microcomputer is changed to the A / D of the microcomputer A via R3.
When the signal is input to the input terminal and the contact of SW2B is closed, the power supply voltage of the microcomputer is input to the A / D input terminal of B of the microcomputer via R3.

Next, RE2 is a rotary encoder 2,
SW2A is a signal contact A interlocked with the rotation axis of RE2.
3, connected to the A / D input terminal A of the microcomputer, SW2
B is a pair of signal contacts B and SW2A interlocked with the rotation axis of RE2, connected to the A / D input terminal B of the microcomputer via R4, and the common connection terminal of SW2A and SW2B of RE2 is connected via the resistor of R5. , A drive power supply of the microcomputer and a reference voltage terminal for A / D of the microcomputer.

As described above, when the contact of SW2A is closed, the voltage divided by R1 and R5 is applied to the A / D input terminal of A of the microcomputer via R3, and when the contact of SW2B is closed. , To the A / D input terminal of B of the microcomputer,
The voltage divided by R2 and R5 is applied via R4.

Next, RE3 is a rotary encoder 3,
SW3A is a signal contact A interlocked with the rotation axis of RE3.
3, connected to A / D input terminal A of the microcomputer, SW3
B is a pair of signal contacts B and SW3A interlocked with the rotation axis of RE3, connected to the A / D input terminal B of the microcomputer via R4, and the common connection terminal of SW3A and SW3B of RE3 is connected via the resistor of R6. , A drive power supply of the microcomputer and a reference voltage terminal for A / D of the microcomputer.

As described above, when the contact of SW3A is closed, the voltage divided by R1 and R6 is applied to the A / D input terminal of A of the microcomputer via R3, and when the contact of SW3B is closed. , To the A / D input terminal of B of the microcomputer,
The voltage divided by R2 and R6 is applied via R4.

The operation and operation of the rotary encoder input detecting device configured as described above will be described below.

When the rotation axis of RE1 is rotated right or left, SW1A and SW1 which are directly connected to the rotation axis of RE1.
The ON / OFF phase of each switch contact of SW1A and SW1B differs depending on the rotational phase angle of the rotating shaft of RE1.

Referring to FIG. 2, when the rotating shaft of RE1 rotates clockwise, the contact of SW1A is set to SW1B.
, The A input terminal of the microcomputer is switched from the LO level to the HI level before the B input terminal of the microcomputer. At this time, SW1B of RE1 is still in the open state. The input terminal holds the LO level.

Therefore, when the rotating shaft of RE1 is continuously rotated clockwise, as shown in FIG. 2, the intermittent outputs having different phases are output from the microcomputers A and B due to the intermittent operation of the switch contacts of SW1A and SW1B. Input to the input terminal.

Next, when the rotating shaft of RE1 is rotated counterclockwise, the switch contacts of SW1A and SW1B are turned on.
The phase to be turned off is reversed from the above clockwise rotation,
After the SW1B contact of RE1 turns on first,
The contact of W1A turns ON.

Therefore, when the rotating shaft of RE1 is continuously rotated in the counterclockwise direction, as shown in FIG. 2, an intermittent output having a phase different from that of the clockwise rotation is produced due to the intermittent operation of the switch contacts of SW1A and SW1B. The signals are input to the input terminals A and B of the microcomputer.

As described above, when both the A and B input terminals are always at the LO level, the RE is in a stationary state, the A input terminal of the microcomputer is HI before the B input terminal, and
When a repetitive signal whose input terminal is HI is input to the microcomputer, the microcomputer detects and determines that the RE is rotating clockwise by inputting an intermittent signal having a phase difference.

At the same time, the microcomputer
/ D conversion, the input voltage level is determined, and the number of input intermittent signals is counted.

Next, the B input terminal of the microcomputer is changed from LO to H first.
In the same manner as above, when the repetition signal of LO → HI is input to the microcomputer, the microcomputer detects that the RE is rotating counterclockwise by the input of the intermittent signal having the phase difference. And determine.

At the same time, the microcomputer inputs A / A
D-conversion is performed, the input voltage level is determined, and the number of intermittent signals input is counted.

(Embodiment 2) Since the output signals from the respective REs are connected in parallel to the A / D input terminals of the microcomputers A and B, which RE of the individual REs has been operated. As a means for identifying the RE, different division resistance values are set for each RE, and a voltage constant corresponding to an output voltage value by the division resistance is stored in a ROM in the microcomputer.

Therefore, the microcomputer performs A / D conversion of the voltage value from the individual RE input to the A / D input terminal and, at the same time, performs a reference comparison with the contents of the RE input voltage constant ROM of the microcomputer to thereby determine the A value of the microcomputer. The microcomputer can identify which RE connected to the A / D input terminal of each of B and B has been operated.

FIG. 3 shows the above-mentioned contents, and the output voltage from each RE (microcomputer A
/ D input terminal voltage waveform).

The RE input circuit of this embodiment has a RE of 3
However, by dividing the voltage constant of the input voltage corresponding to the divided resistance value of the RE into microcontrollers and storing them in the ROM of the microcomputer, even if the equipment requires a large number of REs, the input terminals for the REs can be used. RE can be easily increased without additional increase.

[0033]

As described above, according to the first and second aspects of the present invention, even if a plurality of rotary encoders are installed in one microcomputer, the number of input terminals for the rotary encoder is two as in the past. It can be realized with one input terminal, and even if the device has multiple rotary encoders, it is not necessary to increase the input terminals for the rotary encoder separately, and it is possible to reduce the number of parts around the rotary encoder. Even in devices that require multiple functions and multiple inputs in which multiple rotary encoders are arranged, devices with multiple rotary encoders can be easily configured without reducing the number of microcontroller input terminals by the number of rotary encoders. I can do things.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a rotary encoder according to a first embodiment of the present invention.

FIG. 2 is an output phase waveform diagram when the rotary encoder is rotated clockwise and counterclockwise.

FIG. 3 is an output waveform diagram of a rotary encoder according to a second embodiment of the present invention.

FIG. 4 is a circuit configuration diagram of a conventional rotary encoder.

[Explanation of symbols]

 1 microcomputer A input terminal of microcomputer having A / D function B input terminal of microcomputer having A / D function RE1 rotary encoder 1 RE2 rotary encoder 2 RE3 rotary encoder 3 SW1A switch contact of rotary encoder 1 SW1B rotary encoder 1 Switch contact B R5 Resistance for voltage division of rotary encoder 2 R6 Resistance for voltage division of rotary encoder 3

Claims (2)

[Claims] 1. A device provided with a plurality of rotary encoders, a device provided with an input device for inputting signals from the plurality of rotary encoders, and a control device provided with a control device for controlling the device. A rotary encoder input detection device characterized in that even if a plurality of rotary encoders are provided for one microcomputer, only two input terminals of the rotary encoder can be provided to the microcomputer. 2. A rotary encoder input detection device characterized in that even when inputs of a plurality of rotary encoders are connected in parallel to the same terminal of one microcomputer, inputs of the individual rotary encoders are determined.