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CN-224231730-U - Harmful gas detection circuit based on SMT32

CN224231730UCN 224231730 UCN224231730 UCN 224231730UCN-224231730-U

Abstract

The utility model belongs to the technical field of the power electronics technique and specifically relates to a harmful gas detection circuitry based on SMT32, including main control chip, display chip, bee calling organ, chlorine gas sensor, sulfur dioxide gas sensor, hydrogen sulfide gas sensor, nitrogen dioxide gas sensing, resistance, slide rheostat, electric capacity, crystal oscillator, emitting diode, triode, 3V3 power, 5V power, terminal, the utility model discloses compare with prior art, gas sensor converts chlorine, sulfur dioxide, hydrogen sulfide and nitrogen dioxide's concentration parameter into digital signal, STM32 chip realizes protocol conversion and data acquisition to pass through LCD display screen and bee calling organ with gas data, realize data display and early warning function, improved environmental test's convenience.

Inventors

  • Shi Chaohan

Assignees

  • 博世华域转向系统有限公司

Dates

Publication Date
20260512
Application Date
20250331

Claims (5)

  1. 1. A harmful gas detection circuit based on SMT32, comprises a main control chip, a display chip, a buzzer, a chlorine gas sensor, a sulfur dioxide gas sensor, a hydrogen sulfide gas sensor, a nitrogen dioxide gas sensor, a resistor, a slide rheostat, a capacitor, a crystal oscillator, a light emitting diode, a triode, a 3V3 power supply, a 5V power supply, The terminal is characterized in that a No. 5 pin of a main control chip (U1) is respectively connected with one end of a crystal oscillator (X1) and one end of a capacitor II (C2), a No. 6 pin of the main control chip (U1) is respectively connected with the other end of the crystal oscillator (X1) and one end of a capacitor III (C3), a No. 7 pin of the main control chip (U1) is respectively connected with one end of a resistor II (R2) and one end of a capacitor I (C1), the other end of the resistor II (R2) is connected with a 3V3 power supply, a No. 44 pin of the main control chip (U1) is connected with one end of the resistor I (R1), a No. 34 pin of the main control chip (U1), the No. 37 pin is sequentially and respectively connected with the No. 3 pin and the No. 2 pin of the first terminal (P1), the No. 4 pin of the first terminal (P1) is connected with a 3V3 power supply, the No. 38 pin of the main control chip (U1) is connected with the anode of the light emitting diode (D1) after being connected with the resistor III (R3) in series, and the No. 42 pin and the No. 43 pin of the main control chip (U1) are sequentially and respectively connected with the No. 1 pin of the second terminal (P2), The No. 2 pin is connected, after the No. 21 pin of the main control chip (U1) is connected with the resistor IV (R4) in series, the two paths are respectively connected with the base electrode of the triode (Q1) and one end of the resistor V (R5), the collector electrode of the triode (Q1) is connected with the No. 2 pin of the buzzer (B1), the No. 1 pin of the buzzer (B1) is connected with the 3V3 power supply, the No. 10 to No. 17 pins of the main control chip (U1) are respectively connected with the No. 7 to No. 14 pins of the display chip (LCD 1) in sequence, the No. 29 to No. 31 pins of the main control chip (U1) are respectively connected with the No. 4 to No. 6 pins of the display chip (LCD 1) in sequence, the No. 2 pin of the display chip (LCD 1) is respectively connected with the 5V power supply and one end of the slide rheostat (VR 1), the No. 3 pin of the display chip (LCD 1) is connected with the slide end of the slide rheostat (VR 1), the No. 15 pin of the main control chip (LCD 1) is connected with the 5V power supply in series after the No. 6 pin, the No. 29 to No. 31 pin of the main control chip (U1) is connected with the No. 18 pin of the main control chip (U1) The 19 # pin is connected with RX pin and TX pin of hydrogen sulfide gas sensor (U2) in turn, VCC pin of hydrogen sulfide gas sensor (U2) is divided into three paths and is connected with one end of capacitor ten (C10), one end of capacitor eleven (C11) and 3V3 power supply, 20 # pin and 39 # pin of main control chip (U1) are connected with RX pin and TX pin of sulfur dioxide gas sensor (U3) in turn, VCC pin of sulfur dioxide gas sensor (U3) is divided into three paths and is connected with one end of capacitor twelve (C12), one end of capacitor thirteen (C13) and 3V3 power supply, 40 # pin of main control chip (U1), The No. 41 pin is sequentially and respectively connected with an RX pin and a TX pin of a chlorine gas sensor (U4), the VCC pin of the chlorine gas sensor (U4) is divided into three paths which are respectively connected with one end of a capacitor fourteen (C14), one end of a capacitor fifteen (C15) and a 3V3 power supply, the No. 45 pin and the No. 46 pin of a main control chip (U1) are sequentially and respectively connected with the RX pin and the TX pin of a nitrogen dioxide gas sensor (U5), the VCC pin of the nitrogen dioxide gas sensor (U5) is divided into three paths which are respectively connected with one end of a capacitor sixteen (C16), one end of a capacitor seventeen (C17) and the 3V3 power supply, and the No. 1 pin of the main control chip (U1), The pins 9, 24, 36 and 48 are connected with 3V3 power supply, the pins 8, 23, 35, 47, 1, 16, 1, 3, one (P1), one (C2), one (C10), one (C11), one (C12), one (C13), one (C2), one (C3), one (C2), one (C11), one (C12), The other end of the capacitor fourteen (C14), the other end of the capacitor fifteen (C15), the other end of the capacitor sixteen (C16), the other end of the capacitor seventeen (C17), the other end of the resistor one (R1), the other end of the resistor five (R5), the other end of the sliding rheostat (VR 1), the cathode of the light emitting diode (D1), the emitter of the triode (Q1), the GND pin of the hydrogen sulfide gas sensor (U2), the GND pin of the sulfur dioxide gas sensor (U3), the GND pin of the chlorine gas sensor (U4) and the GND pin of the nitrogen dioxide gas sensor (U5) are grounded.
  2. 2. The harmful gas detection circuit based on SMT32 of claim 1, wherein the main control chip (U1) is STM32F103 series chip, and the display chip (LCD 1) is LCD1602.
  3. 3. The SMT 32-based harmful gas detection circuit of claim 1, wherein the chlorine gas sensor (U4) is of a type TB200B-CL2-50, the sulfur dioxide gas sensor (U3) is of a type TB200B-ES1-SO2-50, the hydrogen sulfide gas sensor (U2) is of a type TB200B-ES1-H2S-50, and the nitrogen dioxide gas sensor (U5) is of a type TB200B-ES1-NO2-50.
  4. 4. The harmful gas detection circuit based on SMT32, wherein the 5V power supply is connected with a No. 2 pin of a terminal three (J1), a No. 20 pin of a capacitor twenty (C20), a No. 1 pin of a voltage stabilizing chip (U6) and a No. 3 pin respectively in four paths, and the 3V3 power supply is connected with one end of a capacitor eighteen (C18), one end of a capacitor nineteen (C19), one end of a capacitor seven (C7), one end of a capacitor eight (C8), one end of a capacitor nine (C9), one end of a capacitor four (C4), one end of a capacitor five (C5), one end of a capacitor six (C6) and a No. 5 pin of the voltage stabilizing chip (U6) respectively in nine paths, and the No. 1 pin of the voltage stabilizing chip (U6), the other end of the capacitor eighteen (C18), the other end of the capacitor nineteen (C19), the other end of the capacitor twenty (C20), the other end of the capacitor seven (C7), the other end of the capacitor eight (C8, and the other end of the capacitor four (C5) of the capacitor four (C6) are connected with the other end of the capacitor six (C5).
  5. 5. The harmful gas detection circuit based on SMT32 according to claim 4, wherein the voltage stabilizing chip (U6) is of the type TLV75533PDBVR.

Description

Harmful gas detection circuit based on SMT32 Technical Field The utility model relates to the technical field of power electronics, in particular to a harmful gas detection circuit based on SMT 32. Background In a certain environmental test, it is often necessary to apply harmful gases such as chlorine, sulfide, nitrogen dioxide, etc. to a sample to be tested, and it is necessary to ensure that the concentration of the applied gases meets the test requirements. At present, the harmful gas detection methods in the market are more, the general measurement scheme has the characteristic of high integration, and the tested object can not cover all the harmful gases required by the specified test. Therefore, it is necessary to design a harmful gas detection circuit based on the SMT32 to realize concentration measurement and output of chlorine, sulfur dioxide, hydrogen sulfide and nitrogen dioxide, thereby improving convenience of environmental test. Disclosure of Invention The utility model aims to overcome the defects of the prior art and provides a harmful gas detection circuit based on SMT32, so as to realize concentration measurement and output of chlorine, sulfur dioxide, hydrogen sulfide and nitrogen dioxide and improve the convenience of environmental test. In order to achieve the above purpose, the utility model relates to a harmful gas detection circuit based on SMT32, which comprises a main control chip, a display chip, a buzzer, a chlorine gas sensor, a sulfur dioxide gas sensor, a hydrogen sulfide gas sensor, a nitrogen dioxide gas sensor, a resistor, a slide rheostat, a capacitor, a crystal oscillator, a light emitting diode, a triode, a 3V3 power supply, a 5V power supply and a terminal, wherein a No. 5 pin of the main control chip is divided into two paths and is respectively connected with one end of the crystal oscillator and one end of a second capacitor, a No. 6 pin of the main control chip is divided into two paths and is respectively connected with the other end of the crystal oscillator and one end of a third capacitor, a No. 7 pin of the main control chip is respectively connected with one end of the second resistor and one end of the first capacitor, the other end of the second resistor is connected with a 3V3 power supply, a No. 44 pin of the main control chip is connected with one end of the first resistor, a No. 34 pin of the main control chip, The No. 37 pin is sequentially and respectively connected with the No. 3 pin and the No. 2 pin of the first terminal, the No. 4 pin of the first terminal is connected with a 3V3 power supply, the No. 38 pin of the main control chip is connected with the anode of the light emitting diode after being serially connected with the resistor III, and the No. 42 pin and the No. 43 pin of the main control chip are sequentially and respectively connected with the No. 1 pin of the second terminal, The No. 2 pin is connected, after the No. 21 pin of the main control chip is connected with the resistor in series, the resistor is connected with the base electrode of the triode and one end of the resistor five respectively in two ways, the collector electrode of the triode is connected with the No. 2 pin of the buzzer, the No. 1 pin of the buzzer is connected with the 3V3 power supply, the No. 10 to No. 17 pins of the main control chip are sequentially connected with the No. 7 to No. 14 pins of the display chip respectively, the No. 29 to No. 31 pins of the main control chip are sequentially connected with the No. 4 to No. 6 pins of the display chip respectively, the No. 2 pin of the display chip is connected with the 5V power supply and one end of the slide rheostat respectively in two ways, the No. 3 pin of the display chip is connected with the slide end of the slide rheostat, the No. 15 pin of the display chip is connected with the 5V power supply after the series resistance six, the No. 18 pins of the main control chip, The 19 # pin is connected with RX pin and TX pin of hydrogen sulfide gas sensor in turn, VCC pin of hydrogen sulfide gas sensor is divided into three paths and is connected with one end of ten capacitors, one end of eleven capacitors and 3V3 power supply, 20 # pin and 39 # pin of main control chip are connected with RX pin and TX pin of sulfur dioxide gas sensor in turn, VCC pin of sulfur dioxide gas sensor is divided into three paths and is connected with one end of twelve capacitors, one end of thirteen capacitors and 3V3 power supply, VCC pin of main control chip is divided into 40 # pin and 41 # pin of main control chip is connected with RX pin and TX pin of chlorine gas sensor in turn, VCC pin of chlorine gas sensor is divided into three paths and is connected with one end of fourteen capacitors, One end of a capacitor fifteen and a 3V3 power supply are connected, a No. 45 pin and a No. 46 pin of a main control chip are sequentially connected with an RX pin and a TX pin of a nitrogen dioxide gas sensor respectively, a VCC pin o