Design Analysis of Sunlight Greenhouse Carbon Dioxide Detector
The application of carbon dioxide gas fertilizer plays an important role in improving the photosynthetic efficiency of crops. Because different crops have different requirements for carbon dioxide concentration, it is necessary to economically and reasonably increase carbon dioxide, and the detection of the concentration of carbon dioxide in the greenhouse becomes obvious. Extremely urgent and important. At present, the price of carbon dioxide detectors for industrial and environmental applications is relatively expensive, and the economic conditions of the majority of farmers are still unsustainable. The following is a preliminary design of the carbon dioxide detector in the solar greenhouse with the objective of economy and practicality.
In general, the CO2 detector input device, intermediate conversion device, and output device are the three basic components of a test system. The key part of the input device is the sensor. The intermediate conversion device is very different depending on the situation. In a simple test system, it may be completely ignored and the sensor output is directly displayed or recorded. In this design, the measurement accuracy is not very high. In order to reduce the cost, only simple debugging circuits are used.
The working principle of the carbon dioxide detector is as follows: The carbon dioxide detection module senses a different carbon dioxide concentration and generates a 0 to 4 volt change voltage signal, which is transmitted to the input of the ICL 7107 via the W1 voltage divider for A/D conversion and display. The ICL7660 provides the ICL7107 with a -5 volt operating voltage. In this design, the thousands of display ICL7107 circuit 19 feet do not use air, only with one, ten, one hundred display, while the single-digit LED digital tube a, b, c, d, e, f foot and 50-ohm resistance Connected to the circuit, only 0 bits are displayed in the digital tube position during operation. Due to the requirement of accuracy of 50×10-6 in the greenhouse, the tens digit of this circuit has been shown to be valid.
Carbon dioxide detector can be widely used in the detection and control of carbon dioxide gas in solar greenhouses. It has the characteristics of low cost and reliable performance. It is an ideal detection instrument for agricultural research institutes and farmers.
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