Design of Correlated Sensor Nodes for Greenhouse Carbon Dioxide Measuring Instrument

The content of carbon dioxide in the greenhouse has a very significant influence on the plants cultivated in the greenhouse. In order to be able to control the content, the application of the carbon dioxide meter in the greenhouse is common. The greenhouse wireless CO2 sensor network node design uses the simulation of the carbon dioxide sensor. The output port samples the analog output through the internal ADC converter, but the analog output does not have high digital output accuracy and strong immunity to interference. The carbon dioxide meter based on the MSP430 single-chip microcomputer uses the CO2 sensor digital output. Due to the incompatibility of the level of the MSP430 microcontroller and the T6004, a pull-down resistor is added to the CO2 sensor sending end, and a high-speed optocoupler chip boost is added to the receiving end. A single measurement system includes a human-machine interface (LCD and keypad), but such a system is only suitable for on-site testing at one site, which is not conducive to the measurement of multiple sites to form the entire network system and the intelligent control of the system.

In the carbon dioxide meter system, the data collected by the nodes comes directly from the sensor module. The node here only realizes a data acquisition function. Due to the adoption of a higher accuracy and sensitivity carbon dioxide sensor module, the data collected by the system is completely reliable and used. Flexible and convenient. The raw data collected during the experiment is shown in Figure 6. The 8 bytes starting from /FFFFFA0 are the entire returned valid data portion. The 5th and 6th bits of the data packet are the lower 8 bits of the 16-bit concentration data respectively. High 8th place, so get the carbon dioxide concentration data of one day.

At 8:30 in the morning, people enter the laboratory one after another, close the windows, and turn on the air conditioner. The concentration of carbon dioxide gradually increases with the increase in the number of people in the laboratory and the passage of time; at 11:30 in the afternoon and around 17:00 in the afternoon, the laboratory is not eaten. , Close the air conditioner, open the window for ventilation, the concentration of carbon dioxide in the indoor air is quickly diluted, return to the normal level of about 300ppm in the atmosphere, and around 22:30 in the evening, people leave the laboratory one after another, turn off the air conditioning, open the window ventilation, concentration Decline quickly.

The data measured by the CO2 measurement instrument in the laboratory can be clearly analyzed. The CO2 concentration curve has a direct relationship with the number of laboratories and the ventilation status. Therefore, it is generally necessary to pay attention to ventilation during the use of air-conditioning. It is advisable to ventilate the air on a regular basis, so that the concentration of carbon dioxide in the indoor air is maintained at an appropriate volume fraction. Of course, many undetected pollutants in the air are also maintained. A better air quality.

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