Container liquid level detection alarm circuit

Abstract

The utility model discloses a container liquid level detection alarm circuit, which comprises a power supply module, a voltage stabilizing circuit, a sensor module, a low-pass filtering module, an analog to digital converter (ADC) conversion module, a microprogrammed control unit (MCU) processing module and an alarm output module, the output end of the voltage stabilizing circuit is electrically connected with the sensor module, the low-pass filtering module, the ADC conversion module, the MCU processing module and the alarm output module. The low-pass filtering module comprises a signal conditioning module and an RC low-pass filtering circuit, and the signal conditioning module is electrically connected with the RC low-pass filtering circuit; the low-pass filtering module, the ADC conversion module and the MCU processing module are combined, signals collected by the sensor module are processed, then alarm is triggered, interference of electric signals is reduced, the purpose of accurate liquid level monitoring can be effectively achieved, and the situation of false alarm in the detection process is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to container liquid level detection alarm circuit technical field especially relates to a container liquid level detection alarm circuit. BACKGROUND

[0002] The container liquid level detection alarm circuit is used for detecting the liquid level in the container, effectively improving the monitoring and control of the container state, ensuring the normal use of the container, and currently high-precision liquid level detection mostly adopts ultrasonic sensor, radar sensor and image detection to detect the container liquid level information, which has high accuracy, but is easily interfered by electric signals during the detection process, leading to false alarm, and further reducing the precision, in order to improve the detection precision, the application provides a container liquid level detection alarm circuit. SUMMARY

[0003] The utility model discloses a container liquid level detection alarm circuit to solve the shortcoming in prior art.

[0004] In order to achieve the above object, the utility model adopts the following technical scheme:

[0005] A container liquid level detection alarm circuit, including power module, voltage stabilizing circuit, sensor module, low pass filter module, ADC conversion module, MCU processing module and alarm output module, the output of power module and the input of voltage stabilizing circuit are connected electrically, the output of voltage stabilizing circuit and sensor module, low pass filter module, ADC conversion module, MCU processing module and alarm output module are connected electrically;

[0006] The low pass filter module includes signal conditioning module and RC low pass filter circuit, and the signal conditioning module and the RC low pass filter circuit are electrically connected.

[0007] Preferably, the sensor module is one of an ultrasonic liquid level sensor or a capacitive sensor, which is used to detect the container liquid level height and convert it into an electric signal to be transmitted to the signal conditioning circuit.

[0008] Preferably, the signal conditioning module comprises operational amplifier U1 and operational amplifier U2, one end of resistor R1 and one end of resistor R2 are electrically connected to pin 2 of operational amplifier U1, resistor R1 and resistor R2 are connected in series, the other end of resistor R1 is electrically connected to the output end of the voltage stabilizing circuit, pin 2 of operational amplifier U1 is electrically connected to the signal output end of the sensor module, the other end of resistor R2 is grounded, resistor R6 is connected in parallel to pin 1 and pin 3 of operational amplifier U1, one end of resistor R3 is electrically connected to pin 3 of operational amplifier U1, the other end of resistor R3 is electrically connected to pin 2 of operational amplifier U2, one end of resistor R5 and one end of resistor R4 are electrically connected to pin 1 of operational amplifier U2, the other end of resistor R5 is grounded, and the other end of resistor R4 is electrically connected to pin 3 of operational amplifier U2.

[0009] Preferably, the RC low-pass filter circuit comprises operational amplifier U3, one end of resistor R7, one end of resistor R8 and one end of capacitor C1 are electrically connected to pin 1 of operational amplifier U3, one end of capacitor C2 is electrically connected to the other end of resistor R8 and the other end of capacitor C1, the other end of resistor R7 and the other end of capacitor C2 are both electrically connected to pin 3 of operational amplifier U2, and pin 2 of operational amplifier U3 is grounded.

[0010] Preferably, the ADC conversion module comprises chip U2, pin 2 of chip U2 is electrically connected to pin 3 of operational amplifier U3, pin 9, pin 10 and pin 11 of chip U2 are respectively electrically connected to one end of switch S1, one end of switch S2 and one end of switch S3, the other end of switch S1, the other end of switch S2 and the other end of switch S3 are all electrically connected to the output end of the voltage stabilizing circuit, pin 9, pin 10 and pin 11 of chip U2 are also respectively electrically connected to one end of resistor R11, one end of resistor R10 and one end of resistor R9, the other end of resistor R9, the other end of resistor R10, the other end of resistor R11 and pin 14 of chip U2 are all grounded.

[0011] Preferably, the receiving end of the MCU processing module is electrically connected to pin 22 of chip U2, the MCU processing module and the ADC conversion module communicate through IIC, and the MCU processing module reads the digital signal converted by the ADC conversion module and calculates the current liquid level height through IIC;

[0012] The formula used by the MCU processing module when calculating the liquid level height is: Wherein V C is the output voltage of the sensor module, V c0 is the calibration voltage when the tank is empty, K c is the sensitivity of the sensor module.

[0013] Preferably, the alarm output module is a buzzer for sounding an alarm when the liquid level exceeds the set range, and when the liquid level exceeds the set range, the MCU processing module controls the buzzer to output a high level through a GPIO pin to trigger the buzzer to sound.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] The utility model discloses a low pass filter module, ADC conversion module and MCU processing module are combined, and the signal of sensor module collection is handled again to trigger the mode of the alarm, reduces the interference of electric signal, can effectively realize the purpose of accurate liquid level monitoring, reduces the false alarm situation in the detection process. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A container liquid level detection alarm circuit is provided for the utility model, and a block diagram of the container liquid level detection alarm circuit is provided.

[0017] Figure 2 A signal conditioning circuit in a container liquid level detection alarm circuit is provided for the utility model, and a circuit diagram of the signal conditioning circuit is provided.

[0018] Figure 3 An RC low pass filter circuit in a container liquid level detection alarm circuit is provided for the utility model, and a circuit diagram of the RC low pass filter circuit is provided.

[0019] Figure 4 An ADC conversion module in a container liquid level detection alarm circuit is provided for the utility model, and a circuit diagram of the ADC conversion module is provided. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0021] REFERENCE Figures 1-4 A container liquid level detection alarm circuit is provided, which comprises a power module, a voltage stabilizing circuit, a sensor module, a low pass filter module, an ADC conversion module, an MCU processing module and an alarm output module. The output end of the power module is electrically connected with the input end of the voltage stabilizing circuit, and the output end of the voltage stabilizing circuit is electrically connected with the sensor module, the low pass filter module, the ADC conversion module, the MCU processing module and the alarm output module. The alarm output module is a buzzer for sounding an alarm when the liquid level exceeds the set range, and when the liquid level exceeds the set range, the MCU processing module controls the buzzer to output a high level through a GPIO pin to trigger the buzzer to sound.

[0022] The low pass filter module comprises a signal conditioning module and an RC low pass filter circuit, and the signal conditioning module and the RC low pass filter circuit are electrically connected.

[0023] The sensor module is one of an ultrasonic liquid level sensor or a capacitive sensor, used for detecting the liquid level height of the container and converting into an electrical signal to be transmitted to the signal conditioning circuit;

[0024] The signal conditioning module comprises an operational amplifier U1 and an operational amplifier U2, one end of a resistor R1 and one end of a resistor R2 are electrically connected to pin 2 of the operational amplifier U1, the resistor R1 and the resistor R2 are connected in series, the other end of the resistor R1 is electrically connected to the output end of the voltage stabilizing circuit, pin 2 of the operational amplifier U1 is electrically connected to the signal output end of the sensor module, the other end of the resistor R2 is grounded, the pin 1 and the pin 3 of the operational amplifier U1 are connected in parallel with a resistor R6, one end of a resistor R3 is electrically connected to pin 3 of the operational amplifier U1, the other end of the resistor R3 is electrically connected to pin 2 of the operational amplifier U2, one end of a resistor R5 and one end of a resistor R4 are electrically connected to pin 1 of the operational amplifier U2, the other end of the resistor R5 is grounded, the other end of the resistor R4 is electrically connected to pin 3 of the operational amplifier U2, wherein the models of the operational amplifier U1 and the operational amplifier U2 are both LM358;

[0025] The RC low-pass filter circuit comprises an operational amplifier U3, one end of a resistor R7, one end of a resistor R8 and one end of a capacitor C1 are electrically connected to pin 1 of the operational amplifier U3, one end of a capacitor C2 is electrically connected to the other end of the resistor R8 and the other end of the capacitor C1, the other end of the resistor R7 and the other end of the capacitor C2 are both electrically connected to pin 3 of the operational amplifier U2, pin 2 of the operational amplifier U3 is grounded;

[0026] The ADC conversion module comprises a chip U2, wherein the model of the chip U2 is ADS1115, pin 2 of the chip U2 is electrically connected to pin 3 of the operational amplifier U3, one end of a switch S1, one end of a switch S2 and one end of a switch S3 are respectively electrically connected to pin 9, pin 10 and pin 11 of the chip U2, the other end of the switch S1, the other end of the switch S2 and the other end of the switch S3 are all electrically connected to the output end of the voltage stabilizing circuit, one end of a resistor R11, one end of a resistor R10 and one end of a resistor R9 are respectively electrically connected to pin 9, pin 10 and pin 11 of the chip U2, the other end of the resistor R9, the other end of the resistor R10, the other end of the resistor R11 and pin 14 of the chip U2 are all grounded;

[0027] The receiving end of the MCU processing module is electrically connected to pin 22 of the chip U2, the MCU processing module and the ADC conversion module communicate through IIC, the MCU processing module reads the digital signal converted by the ADC conversion module through IIC and calculates the current liquid level height, wherein the MCU processing module is built-in with a processing chip, and the model of the processing chip is STM32;

[0028] The formula used by it when calculating the liquid level height is: Wherein V C is the output voltage of the sensor module, V c0 is the calibration voltage when the tank is empty, K c is the sensitivity of the sensor module; the utility model discloses a low pass filter module, ADC conversion module and MCU processing module are combined, and the signal of sensor module is handled to the mode of triggering alarm again, reduces the interference of electric signal, and can effectively realize the purpose of accurate liquid level monitoring, reduces the false alarm situation in the detection process.

[0029] Working principle: when using, the power module provides voltage and is converted into stable voltage by the voltage stabilizing circuit to stably power each module, the sensor module detects the liquid level in the container and converts it into an electric signal to the signal conditioning circuit, the operational amplifier U1 and operational amplifier U2 in the signal conditioning circuit amplify the signal transmitted by the sensor module, adjust to the appropriate voltage range to adapt to the ADC conversion module collection, the signal after conditioning is transmitted to the RC low pass filter circuit, the RC low pass filter circuit removes the high frequency noise in the signal, ensures the stability of the signal, the ADC conversion module collects the signal after low pass filtering and converts it into a digital signal, sends the data to the MCU processing module through IIC communication, the MCU reads the digital signal converted by the ADC conversion module through IIC, calculates the current liquid level height, and judges the liquid level, when the liquid level exceeds the set range, the MCU processing module controls the buzzer to output high level through the GPIO pin, triggers the buzzer to sound alarm and reminds personnel, through the mode of signal processing after the sensor module collection and triggering alarm again, the interference of electric signal is reduced, and the purpose of accurate liquid level monitoring can be effectively realized.

[0030] The above is only the preferred specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme and utility model concept of the utility model, equivalent replacement or change, should be covered in the protection scope of the utility model.

Claims

1. A container liquid level detection alarm circuit, characterized by comprising: The power module, the voltage stabilizing circuit, the sensor module, the low-pass filter module, the ADC conversion module, the MCU processing module and the alarm output module are connected with each other. The low-pass filter module comprises a signal conditioning module and an RC low-pass filter circuit.

2. The liquid level detection and alarm circuit according to claim 1, wherein, The sensor module is one of an ultrasonic liquid level sensor or a capacitive sensor, which is used for detecting the liquid level height of a container and converting the liquid level height into an electric signal to be transmitted to the signal conditioning circuit.

3. The liquid level detection and alarm circuit according to claim 1, wherein, The signal conditioning module comprises an operational amplifier U1 and an operational amplifier U2.

4. The liquid level detection and alarm circuit according to claim 3, wherein, The RC low-pass filter circuit comprises an operational amplifier U3.

5. The liquid level detection and alarm circuit according to claim 4, wherein, The ADC conversion module comprises a chip U2.

6. The liquid level detection and alarm circuit according to claim 5, wherein, The receiving end of the MCU processing module is electrically connected with the pin 22 of the chip U2, the MCU processing module and the ADC conversion module communicate through IIC, the MCU processing module reads the digital signal converted by the ADC conversion module through IIC and calculates the current liquid level height ; wherein is the output voltage of the sensor module, is the calibration voltage when the tank is empty, is the sensitivity of the sensor module.

7. The liquid level detection and alarm circuit according to claim 1, wherein, The alarm output module is a buzzer, which is used for sounding an alarm when the liquid level exceeds the set range. The MCU processing module controls the buzzer to output a high level through a GPIO pin to trigger the buzzer to sound when the liquid level exceeds the set range.

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