CN219368988U

CN219368988U - Intelligent floor matrix scanning sampling circuit

Info

Publication number: CN219368988U
Application number: CN202320591368.4U
Authority: CN
Inventors: 李寅生; 杨日伟; 潘振
Original assignee: Shanghai Yinsheng Technology Co ltd
Current assignee: Shanghai Yinsheng Technology Co ltd
Priority date: 2023-03-23
Filing date: 2023-03-23
Publication date: 2023-07-18
Anticipated expiration: 2033-03-23

Abstract

The utility model belongs to the technical field of integrated circuits, and particularly relates to an intelligent floor matrix scanning sampling circuit. An intelligent floor matrix scanning sampling circuit comprises a plurality of pressure sensors; further comprises: a microcontroller; the controlled ends of the N switches are connected with the microcontroller; the pressure sensor is divided into N groups, each group is provided with M pressure sensors, N and M are natural numbers larger than 1, one end of each group of M pressure sensors is connected with each other and is connected with a power supply end, the other end of each group of M pressure sensors is connected with one end of a voltage dividing resistor, the other ends of the M voltage dividing resistors are connected with each other and are grounded through a corresponding switch, and a common end between each pressure sensor and each voltage dividing resistor is connected with a signal input end of the microcontroller. According to the utility model, each group of switches are switched, so that the voltage value of a single row of the pressure sensor matrix array is read step by step, and the voltage value of one group of pressure sensors can be read at one time, thereby realizing high-precision, rapid and concise data sampling.

Description

Intelligent floor matrix scanning sampling circuit

Technical Field

The utility model belongs to the technical field of integrated circuits, and particularly relates to an intelligent floor matrix scanning sampling circuit.

Background

With the increasing popularity of smart home, smart floors have also grown. In the prior art, pressure sensors are typically laid in intelligent floors to monitor pressure information. Because the floor is usually large in laying area, the number of pressure sensors distributed on the intelligent floor is large, if each sensor is independently sampled, the circuit is very bulky, the circuit hardware is complex, and the consumed computing resources are large.

Disclosure of Invention

Aiming at the technical problem that a sampling circuit is complex in a scene with a large number of pressure sensors, the utility model aims to provide an intelligent floor matrix scanning sampling circuit.

An intelligent floor matrix scanning sampling circuit comprises a plurality of pressure sensors;

further comprises:

a microcontroller;

the controlled ends of the N switches are connected with the microcontroller;

the pressure sensor is divided into N groups, each group is provided with M pressure sensors, N and M are natural numbers larger than 1, one end of each group of M pressure sensors is connected with one another and is connected with a power supply end, the other end of each group of pressure sensors is connected with one end of a voltage dividing resistor, the other ends of the M voltage dividing resistors are connected with one another and are grounded through a corresponding switch, and a public end between the pressure sensors and the voltage dividing resistors is connected with a signal input end of the microcontroller.

As a preferable scheme, the switch is a MOS tube, the grid electrode of the MOS tube is connected with the signal output end of the microcontroller, the source electrode of the MOS tube is grounded, and the drain electrode of the MOS tube is connected with the other ends of a group of M voltage dividing resistors.

Preferably, the MOS transistor is an NMOS transistor.

Preferably, the method further comprises:

and the common end between the pressure sensor and the voltage dividing resistor in each group is respectively connected with the input end of the analog-digital conversion module, and the output end of the analog-digital conversion module is connected with the signal input end of the microcontroller.

Preferably, the microcontroller is a microcontroller with an analog-to-digital conversion module.

Preferably, the microcontroller is connected with an external device through serial port communication.

Preferably, the pressure sensor is a resistive film pressure sensor.

The utility model has the positive progress effects that: the intelligent floor matrix scanning sampling circuit is adopted, and each group of switches are switched to be communicated, so that the voltage value of a single row of the pressure sensor matrix array is read step by step, the voltage value of one group of pressure sensors can be read at one time, and high-precision, rapid and concise data sampling is realized.

Drawings

FIG. 1 is a schematic circuit diagram of the present utility model;

fig. 2 is a partial enlarged view of fig. 1.

Detailed Description

In order that the manner in which the utility model is practiced, as well as the features and objects and functions thereof, will be readily understood and appreciated, the utility model will be further described in connection with the accompanying drawings.

Referring to fig. 1, the utility model provides an intelligent floor matrix scanning sampling circuit, which comprises a plurality of pressure sensors, wherein the plurality of pressure sensors are distributed on an intelligent floor, and the pressure sensors are grouped into N groups due to the fact that the number of the pressure sensors is large, each group is provided with M pressure sensors, and N and M are natural numbers larger than 1. For example, as shown in FIG. 1, there are 36 pressure sensors, which are grouped into 6 groups of 6 pressure sensors each, A1-6, B1-6 … … F1-6, respectively. Each group is used as a row of pressure sensors and is uniformly embedded on the intelligent floor.

Referring to fig. 2, taking the pressure sensors of the group A1-6 as an example, one ends of the pressure sensors of the group A1-6 are connected with each other and are connected with a power supply end, the other ends of the pressure sensors of the group A1-6 are respectively connected with one ends of the voltage dividing resistors R1-R6, the other ends of the 6 voltage dividing resistors R1-R6 are connected with each other and are grounded through a corresponding switch MA1, and a common end between the pressure sensors and the voltage dividing resistors is connected with a signal input end of the microcontroller U1. The signal output terminal of the microcontroller U1 is connected with the controlled terminal of the switch MA 1.

The other groups of pressure sensors adopt the same circuit layout, and therefore the pressure sensor array has 6 switches, namely a switch MA1 and a switch MB1 … … switch MF1, signal output ends of the 6 switches are respectively connected with controlled ends of the 6 switches, the microcontroller U1 controls the 6 switches to be turned off, and finally, the switch channels of each row are switched step by step, so that the pressure value of a single row of the pressure sensor array of each group is read step by step.

In some embodiments, the switch is a MOS transistor, a gate of the MOS transistor is connected to a signal output end of the microcontroller U1, a source of the MOS transistor is grounded, and a drain of the MOS transistor is connected to another end of the corresponding set of M voltage dividing resistors.

In some embodiments, the MOS transistor is an NMOS transistor.

In some embodiments, the intelligent floor matrix scanning sampling circuit further includes an analog-to-digital conversion module U2, and at this time, the common end between the pressure sensor and the voltage dividing resistor in each group is not directly connected to the signal input end I2C of the microcontroller U1, but is respectively connected to the input end of the analog-to-digital conversion module U2, and the output end of the analog-to-digital conversion module U2 is connected to the signal input end I2C of the microcontroller U1, so that the pressure value is subjected to analog-to-digital conversion by the analog-to-digital conversion module U2 and then transmitted to the microcontroller U1.

In some embodiments, for the sake of circuit simplification and high integration, the microcontroller U1 with the built-in analog-to-digital conversion module U2 may also be directly selected, where the common terminal between the pressure sensor and the voltage dividing resistor in each group is directly connected to the signal input terminal of the microcontroller U1.

In some embodiments, the microcontroller U1 is connected to an external device by way of serial communication.

In some embodiments, the microcontroller U1 is a single-chip microcomputer.

In some embodiments, the pressure sensor is a resistive thin film pressure sensor.

In some embodiments, referring to fig. 1 and 2, the circuit has a 6*6 resistive film pressure sensor array, each row of pressure sensors is controlled to be turned on and off by one MOS tube, each MOS tube controls one channel, 6 channels are provided in the middle, the channels are CH1 to CH6 respectively, the channels CH1 to CH6 are connected with IO pins of a singlechip, a program preset in the singlechip sequentially turns on each channel, and a switch of the MOS tube is switched in a progressive scanning manner.

And when the channel CH1 is opened, a 5V power supply end source passes through the pressure sensor unit, sequentially passes through the voltage dividing resistor and the MOS tube and then reaches the negative electrode (ground end) of the power supply. When no external pressure exists in the pressure sensor, the resistance is quite large and equivalent to short circuit, when external pressure is applied, the resistance is sharply reduced, and the resistance value corresponds to the applied pressure. Thus, in the pressure sensor unit A1-6 in the figure, each pin outputs a voltage value corresponding to pressure, the voltage value of A1-6 is sent to an AD analog-to-digital conversion module, and the module can read the voltage values of 6 pins at a time and transmit data to a singlechip through I2C.

And switching different channels through the singlechip, recording the voltage value of each pressure sensor unit of the CH 1-CH 6 channels, and transmitting the voltage value to external equipment through serial communication.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An intelligent floor matrix scanning sampling circuit comprises a plurality of pressure sensors;

characterized by further comprising:

a microcontroller;

the controlled ends of the N switches are connected with the microcontroller;

the pressure sensors are divided into N groups, each group is provided with M pressure sensors, and N and M are natural numbers larger than 1;

and one end of each group of M pressure sensors is connected with one end of each other and is connected with a power supply end, the other end of each pressure sensor is connected with one end of each voltage dividing resistor, the other ends of the M voltage dividing resistors are connected with one another and are grounded through a corresponding switch, and a common end between each pressure sensor and each voltage dividing resistor is connected with a signal input end of the microcontroller.

2. The intelligent floor matrix scanning sampling circuit according to claim 1, wherein the switch is a MOS transistor, a gate of the MOS transistor is connected to a signal output end of the microcontroller, a source of the MOS transistor is grounded, and a drain of the MOS transistor is connected to another end of the corresponding set of M voltage dividing resistors.

3. The intelligent floor matrix scan sampling circuit of claim 2, wherein the MOS transistor is an NMOS transistor.

4. The intelligent floor matrix scan sampling circuit of claim 1, further comprising:

5. The intelligent floor matrix scan sampling circuit of claim 1 wherein said microcontroller is a microcontroller with an analog to digital conversion module built-in.

6. The intelligent floor matrix scan sampling circuit of claim 1 wherein said microcontroller is connected to an external device by way of serial communications.

7. The intelligent floor matrix scan sampling circuit of claim 1 wherein said pressure sensor is a resistive thin film pressure sensor.