An experimental teaching aid for determining the effect of light conditions on photosynthesis intensity

Abstract

The utility model discloses an experimental teaching aid of determining the influence of illumination condition on photosynthesis intensity, including the box, the inside of box is provided with a plurality of experiment cavities, and the top of each experiment cavity is installed with the pixel screen, and the pixel screen is connected with no. The infrared receiving sensor is connected with infrared emission sensor, temperature sensor, bluetooth module, no. The infrared receiving sensor, infrared emission sensor, temperature sensor, bluetooth module, no. The infrared receiving sensor, temperature sensor, bluetooth module and infrared emission sensor are connected with no. The utility model discloses the light source mode is adjusted through bluetooth, and the air pressure change in unit time is determined to the air pressure sensor, can explore the influence of illumination condition on photosynthesis intensity.

Description

Technical Field

[0001] This utility model belongs to the technical field of high school biology experimental devices, and specifically relates to an experimental teaching aid for measuring the effect of light conditions on the intensity of photosynthesis. Background Technology

[0002] "Investigating the Influence of Environmental Factors on the Intensity of Photosynthesis" is an experiment in Chapter 5, Section 4, "The Source of Energy—Light and Photosynthesis," of the People's Education Press textbook "Biology, Required Course 1, Molecules and Cells." The textbook suggests using small round leaf blades with holes punched in them and air removed as experimental materials, using the distance from the desk lamp as the light intensity, and using the number of small round leaf blades that sink to the bottom and float to the surface per unit time as the indicator of photosynthetic intensity.

[0003] However, in actual teaching, the experiments require a lot of equipment, involve complicated steps, take a long time, and the experimental phenomena are not obvious. It is impossible to organize large-scale student experiments. The experimental material leaves need to be treated, and human factors can lead to large errors and make it impossible to repeat. The experiments in the textbook only explore the effect of light intensity on the intensity of photosynthesis, which is difficult to reflect the changes in the intensity of photosynthesis in the real environment.

[0004] To address the above problems, the inventors innovated upon existing textbook experiments, creating a self-made experimental teaching aid that incorporates a Bluetooth control module, a light control system, a pressure sensor, and a temperature sensor. This makes the experimental operation more convenient, accurate, and simple, and the experimental results more obvious. The device can detect the effects of light intensity, light quality, and light interval on the intensity of photosynthesis. It has a wide range of applications, the results can be quantitatively analyzed, and it is suitable for widespread application. Summary of the Invention

[0005] The purpose of this invention is to provide an experimental teaching tool for determining the effect of light conditions on the intensity of photosynthesis. This teaching tool adjusts the light source mode via Bluetooth and uses a pressure sensor to measure the change in air pressure per unit time. It can explore the effect of light conditions on the intensity of photosynthesis, solving the problems of the original experiment being cumbersome, unable to perform quantitative analysis, and prone to large errors due to human factors when processing materials. Furthermore, the experiment could not explore light condition factors such as light quality and interval lighting.

[0006] This utility model provides the following technical solution: An experimental teaching aid for determining the effect of light conditions on the intensity of photosynthesis includes a box with multiple experimental chambers inside. Each experimental chamber has a pixel screen mounted on its top. The pixel screen is connected to a microcontroller, which is connected to an infrared receiving sensor. The microcontroller and the infrared receiving sensor are fixed to the back of the box. A glass bottle is placed at the bottom of the experimental chamber. A rubber stopper is installed at the mouth of the glass bottle. One end of an infusion tube is connected to the through hole in the rubber stopper, and the other end of the infusion tube is connected to the sensing hole of the pressure sensor. The back of the enclosure is also fixed with an infrared emission sensor, a temperature sensor, a Bluetooth module, a second microcontroller, and a circuit experimental board. The air pressure sensor, temperature sensor, Bluetooth module, and infrared emission sensor are connected to the second microcontroller. Each experimental chamber is equipped with a pull-out door at the front.

[0007] Furthermore, a handle is installed on the top of the box.

[0008] When using the teaching aid, first connect it to a power source, turn on your phone's Bluetooth and Bluetooth debugger, connect the teaching aid via Bluetooth, and select a lighting mode, including gradient light intensity mode, colored light mode, and interval lighting mode. After selecting a lighting mode, the phone sends instructions to the second microcontroller via the Bluetooth module. The second microcontroller sends the instructions out via an infrared transmitter sensor, and the infrared receiver sensor receives the signals. The first microcontroller uses these signals to control the 8*8 RGB pixel screen to display different lighting modes. After the environment changes, the air pressure inside the glass bottle will change due to photosynthesis within a certain time range. The second microcontroller collects the real-time data measured by the air pressure sensor and the temperature sensor, and sends the data to the phone via the Bluetooth module.

[0009] The principle of this utility model is as follows: This utility model is divided into two parts: a Bluetooth light control system and a barometric pressure measurement system. The light source mode is adjusted through the Bluetooth module, and the barometric pressure sensor measures the change in barometric pressure inside the sealed glass bottle due to photosynthesis within a unit of time. The measurement data is then sent to a mobile phone for display and processing via the Bluetooth module.

[0010] This utility model has the following features: 1. Separate compartment operation: The apparatus is divided into five wooden compartments, which allows for better control of lighting conditions and makes the experiment more accurate. The intensity of respiration can be investigated by controlling whether there is light. Multiple experiments can be carried out at the same time, saving experimental time.

[0011] 2. Bluetooth Control Module: Using the Bluetooth control module, a mobile phone can be connected to the device via Bluetooth to directly control the experimental device and send the measured air pressure data generated by photosynthesis to the mobile phone in real time, making the experimental data quantifiable and visualized.

[0012] 3. Bluetooth Light Control System: Five 8*8 RGB pixel screens were used as five-box light sources. Based on the light conditions for photosynthesis to be explored, three light source modes were programmed and implemented. The first is the light intensity gradient mode to explore the effect of different light intensities on photosynthesis; the second is the colored light mode to explore the effect of different light qualities on photosynthesis; and the third is the interval lighting mode to explore the effect of continuous lighting and lighting at different time intervals on the intensity of photosynthesis.

[0013] 4. Pressure Sensing Module: The pressure sensing module is connected to the sealed glass bottle for photosynthesis via an infusion set. The intensity of photosynthesis is quantified based on the gas pressure generated by the photosynthesis measurement bottle. The intensity of photosynthesis under different environmental factors can be visualized and compared. The pressure sensing module measures the gas pressure generated as photosynthetic intensity data, which can digitize the intensity of photosynthesis and perform quantitative analysis on the impact of different environmental factors on the intensity of photosynthesis.

[0014] 5. Temperature sensing module: The temperature sensor can measure the experimental environment temperature in real time.

[0015] 6. Infrared Sensing Module: This module consists of an infrared receiving sensor and an infrared transmitting sensor. To avoid voltage fluctuations in the barometric pressure measurement circuit due to the intermittent lighting pattern, the infrared transmitting module is connected to the barometric pressure measurement system, and the infrared receiving module is connected to the lighting system. The Bluetooth control module is then connected to the barometric pressure measurement system, allowing real-time barometric pressure data to be transmitted to the mobile phone. The mobile phone sends digital signals for lighting control, which can then be controlled via the infrared transmitting and receiving modules. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the appearance of the present utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a rear view of the present invention; Figure 4 for Figure 3 Top view; Figure 5 This invention relates to the effect of light intensity on the intensity of photosynthesis during its application. Figure 6 This invention utilizes the effect of time quality on the intensity of photosynthesis. Figure 7 This invention relates to the effect of time interval light irradiation on the intensity of photosynthesis.

[0017] The following are labeled in the diagram: 1. Box body; 2. Pixel screen; 3. Pressure sensor; 4. Infusion tube; 5. Rubber stopper; 6. Glass bottle; 7. Infrared receiving sensor; 8. Temperature sensor; 9. Bluetooth module; 10. Microcontroller No. 1; 11. Circuit experiment board; 12. Infrared transmitting sensor; 13. Microcontroller No. 2; 14. Experiment chamber; 15. Handle; 16. Sliding door. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0019] See appendix Figure 1-4 An experimental teaching aid for measuring the effect of light conditions on the intensity of photosynthesis includes a box 1, with multiple experimental chambers 14 inside the box 1. A pixel screen 2 is installed on the top of each experimental chamber 14. The pixel screen 2 is connected to a first microcontroller 10, and the first microcontroller 10 is connected to an infrared receiving sensor 7. The first microcontroller 10 and the infrared receiving sensor 7 are fixed on the back of the box 1. A glass bottle 6 is placed at the bottom of the experimental chamber 14. A rubber stopper 5 is installed at the mouth of the glass bottle 6. One end of an infusion tube 4 is connected to the through hole in the rubber stopper 5. The other end of the infusion tube 4 is connected to the sensing hole of the pressure sensor 3. An infrared emission sensor 12, a temperature sensor 8, a Bluetooth module 9, a second microcontroller 13, and a circuit experimental board 11 are also fixed on the back of the box 1. The pressure sensor 3, temperature sensor 8, Bluetooth module 9, and infrared emission sensor 12 are connected to the second microcontroller 13. A pull-out door 16 is provided at the front end of each experimental chamber 14. A handle 15 is installed on the top of the box 1.

[0020] Among them: Microcontroller: UNO R3, Jinhua Zejie Technology Co., Ltd. Bluetooth module: HC06, Jinhua Zejie Technology Co., Ltd. Barometric pressure sensor: MSP20, Fu'an Stein Electronic Technology Co., Ltd. Temperature sensor: DS18B20, Jinhua Zejie Technology Co., Ltd. Infrared sensor module: 38KHz, Shenzhen Jiaxin Microelectronics Co., Ltd. 8*8 RGB pixel screen: WS2812B, Shenzhen Kaiser Optoelectronics Technology Co., Ltd.

[0021] When using the teaching aid, first connect it to a power source, turn on your phone's Bluetooth and Bluetooth debugger, connect the teaching aid via Bluetooth, and select a lighting mode, including gradient light intensity mode, colored light mode, and interval lighting mode. After selecting a lighting mode, the phone sends instructions to the second microcontroller via the Bluetooth module. The second microcontroller sends the instructions out via an infrared transmitter sensor, and the infrared receiver sensor receives the signals. The first microcontroller uses these signals to control the 8*8 RGB pixel screen to display different lighting modes. After the environment changes, the air pressure inside the glass bottle will change due to photosynthesis within a certain time range. The second microcontroller collects the real-time data measured by the air pressure sensor and the temperature sensor, and sends the data to the phone via the Bluetooth module.

[0022] See Figure 5-7 The specific experimental process is analyzed using *Hydrilla verticillata* as an example: (1) Investigating the effect of light intensity on the intensity of photosynthesis: Following the experimental procedure, the lighting mode was selected as the light intensity gradient mode. The LEDs in the pixel screens of the first wooden box did not emit light, while the LEDs in the pixel screens of the subsequent four wooden boxes emitted light at progressively stronger levels of 7.5W, 15W, 22.5W, and 30W respectively. The results are as follows... Figure 5 As shown, the first wooden box represents a dark environment where organisms only respire and do not perform photosynthesis. The negative value of the air pressure change per unit time represents the intensity of respiration. The experimental data was plotted using Excel to create a light intensity-photosynthesis intensity curve. The point where the curve intersects the x-axis indicates that the air pressure remains constant, and the intensity of photosynthesis equals the intensity of respiration; this is the light compensation point. Furthermore, the point on the curve where the air pressure increases without a change in light intensity is the light saturation point. Figure 5 It can be seen that within 30 minutes, the photosynthetic intensity of Elodea increases with the increase of light intensity.

[0023] (2) Investigating the effect of light quality on the intensity of photosynthesis: Following the steps above, select the colored light mode. The LEDs in the pixel screens inside the five wooden boxes will emit white, red, blue, purple, and green light. The result is as follows: Figure 6 It can be seen that within 30 minutes, the photosynthetic intensity of Elodea is highest under white light, followed by violet and red light, while the photosynthetic intensity is weakest under blue and green light.

[0024]

[0025] (3) Investigate the effect of intermittent light on the intensity of photosynthesis: Selecting the interval lighting mode, the LEDs of the pixel screens in the five wooden boxes will emit white light in four different modes: constantly lit, every 0.2 seconds, every 1 second, every 5 seconds, and every 25 seconds. The results are as follows: Figure 7 It can be seen that the photosynthetic intensity of Elodea is highest when the light is constantly on within 30 minutes, followed by the photosynthetic intensity when the light interval is 0.2s and 1s, and no photosynthesis occurs when the light interval is more than 5s.

[0026]

[0027] Although embodiments of this utility model patent have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model patent, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An experimental teaching aid for determining the effect of light conditions on the intensity of photosynthesis, characterized in that: Includes a housing (1), with multiple experimental chambers (14) inside the housing (1). Each experimental chamber (14) has a pixel screen (2) installed on its top. The pixel screen (2) is connected to a microcontroller (10), which is connected to an infrared receiving sensor (7). The microcontroller (10) and the infrared receiving sensor (7) are fixed on the back of the housing (1). A glass bottle (6) is placed at the bottom of the experimental chamber (14). A rubber stopper (5) is installed at the mouth of the glass bottle (6). One end of the infusion tube (4) is connected to the through hole on the rubber stopper (5). The other end of the infusion tube (4) is connected to the sensing hole of the pressure sensor (3). The back of the housing (1) is also fixed with an infrared emission sensor (12), a temperature sensor (8), a Bluetooth module (9), a second microcontroller (13) and a circuit experimental board (11). The air pressure sensor (3), temperature sensor (8), Bluetooth module (9) and infrared emission sensor (12) are connected to the second microcontroller (13). Each experimental chamber (14) is equipped with a pull-out door (16) at the front end.

2. The experimental teaching aid for determining the effect of light conditions on the intensity of photosynthesis according to claim 1, characterized in that: A handle (15) is installed on the top of the box (1).

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